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News from Rohde & Schwarz 167

1. uuuoooonnnn nnen 16 Spectrum Monitoring Software ARGUS 4 0 New software generation for spectrum monitoring systems 18 Electronic spare parts catalog Short clicking is better than long leafing oooo LLA 21 Noise Measurement Software FS K3 Noise test system with FSE FSIQ or FSP analyzers sssssssss 23 2 News from Rohde amp Schwarz Number 167 2000 Il Rudolf Schindlmeier Universal Radio Communication Tester CMU 200 GSM power measurement versatile fast and accurate s 24 Roland Mahr Universal Radio Communication Tester CMU 200 Test CMU 2 OO 26 Detlef Wiese Software for mobile radio conformance test systems Convenient parameter sets instead of time consuming low level programming 28 Franz Josef Zimmermann TV Test Transmitter SFQ Biterror rate measurement on set top boxes cccccesesseeceeceseeeeeeeeeeaaan ees 30 Christoph Balz DVB T Test Receiver EFA T Innovative measurement functions for terrestrial digital TV 32 Ulrich Otto 64 kbit modem for multifunctional mobile radios Software enhancement of functions for future reguirements 34 Stefan B ttinger Workshop on CD ROM Miniport Receiver EB 200 sisiane 35 TOME OM M priii NINE T 36 Press COM MGM eee e a e E Df IN SVS UN ee moni mui Kou dete nene NE opp UN onM tuu Db UNE eid 3
2. For special purpose tests defined error states can also be pro duced in this way Production Test signals already generated at the development stage can be re used in the production of the equipment in ques tion Compatibility with DVG the MPEG2 generator most widely used News from Rohde amp Schwarz Number 167 2000 Il 9 makes it possible to replay signals on both units In addition to the low wear operation of DVRG which makes it ideal for continuous service its sturdy design also makes it an interesting proposition for a production environment A stan REFERENCES 1 Fischbacher Michael Weigold Harald MPEG2 Generator DVG and MPEG2 Mea surement Decoder DVMD Test equipment for digital TV in line with MPEG2 News from Rohde amp Schwarz 1996 No 152 pp 20 23 2 Weigold Harald MPEG2 measurement generators and decoders Let s go west ATSC ready for takeoff News from Rohde amp Schwarz 1999 No 164 pp 20 21 Fischbacher Michael Rohde Werner PC software for MPEG2 dream team DVG DVMD News from Rohde amp Schwarz 1997 No 154 p 29 4 W rner Alexander Digital Video Quality Analyzer DVG Getting the picture on pic ture quality News from Rohde amp Schwarz 1999 No 163 pp 4 7 Fischbacher Michael MPEG2 Realtime Monitor DVRM Digital broadcast net works operation secured News from Rohde amp Schwarz 1999 No 165 pp 14 15 3 i 5 i FIG 3 Windows u
3. amp Schwarz 1997 No 156 pp 4 6 Fokken Theodor Miniport Receiver EB 200 Compact Receiver ESMC Mini receivers remote control lends weight to network role News from Rohde amp Schwarz 1999 No 165 pp 16 17 Demmel Franz Wille Raimund VHF UHF Direction Finder DDF 190 Digital direc tion finding from 20 MHz to 3000 MHz to ITU guidelines News from Rohde amp Schwarz 1996 No 152 pp 30 32 Demmel Franz Unselt Ulrich Digital Direc tion Finder DDF 190 Now from 0 5 MHz through 3000 MHz News from Rohde amp Schwarz 2000 No 166 pp 16 17 2 I 3 L 4 9 kHz to 3 GHz frequency offset field strength modulation parameters bandwidth frequency occupancy with PC AM FM CW LSB USB ISB PM IQ 18 150 Hz to 300 kHz shape factor 2 1 and 3 200 kHz 500 kHz 1 MHz not for demodulation frequency scan memory scan RF spectrum DIGI Scan option Ethernet 10BaseT or RS 232 C option 40 W 8 kg 227 mm x 153 mm x 474 mm News from Rohde amp Schwarz Number 167 2000 Il TA Articles DTV Recorder Generator DVRG Recording processing and replaying MPEG2 transport streams From the very beginning of digital television Rohde amp Schwarz has demonstrated its competence in terms of MPEG2 with MPEG2 Generator DVG and MPEG2 Measurement Decoder DVMD 1 2 This instrument duo with its unparalleled features is today found virtually wherever MPEG2 transport streams appear and hav
4. ITU 601 SMPTE 259E to ISO IEC 1 13818 ATSC 188 208 bytes selectable DVB 188 204 bytes selectable endless or limited by hard disk size transportstream library with approx 80 sequences 18 Gbytes or 2 x 18 Gbytes Microsoft Windows Embedded NT Ethernet 100BaseT RS 232 C ATSC Test Receiver EFA All measurement functions for North American digital TV standard Following North America s decision in favour of ATSC VSB Advanced Television Systems Committee for digital TV broadcasting Rohde amp Schwarz started to develop the necessary instrumentation and transmitters see overview on page 13 After the successful launch of test receivers for analog TV signals and European digital TV standards a new member for ATSC has now joined the EFA family Compact in design and with extensive automatic test functionality this receiver FIG 1 is ideal for applications in the development and production of transmitter modulators as well as acceptance testing of large transmitter systems and monitoring the quality of digital TV signals ATSC Test Receiver EFA joins EFA instrument family adding measurements in digital TV systems to North American ATSC VSB standard FIG 1 Full ATSC coverage by 2002 Key features of the North American digital TV standard are the use of MPEG2 Moving Pictures Experts Group to compress video and audio signals and 8VSB modulation see box pp 12 13 A decisive factor for fast nationwide
5. pressed and only the noise component at the desired receive frequency is considered But often suitable filters will not be available and first have to Correction factor for noise figure and gain at image frequency be provided That is why this solution is too time consuming and inflexible for use in labs FS K3 offers a way around this prob lem The difference between receive and image frequency in the conversion losses of a mixer can be entered in the software A correction factor for the measured noise figure or gain is then calculated as a function of this difference which will be called image rejection The FIG illustrates the relation ship between the correction factor and image rejection To obtain the equivalent noise figure for a sideband the correction factor for the given suppression has to be added to the measured value For gain you proceed in a similar way but subtract the correction factor from the measured value The suppression can be deter mined by measuring the conversion loss of the DUT at the receive and image frequency eg with Network Analyzer ZVR Robert Obertreis Reader service card 167 08 Correction factor dB Image rejection dB gt News from Rohde amp Schwarz Number 167 2000 1 23 Universal Radio Communication Tester CMU 200 GSM power measurement versatile fast and accurate Measurement speed and accuracy these are the key criteria in producti
6. simultaneously by loudspeaker In addi tion signals can be switched exclu sively to up to three further outputs for more detailed analysis The available LAN or WAN serves for distributing the signals between sta tions Advanced multicast technology like that in Internet radio is used In this way signals of interest can be analyzed simultaneously at all work stations There is no need for multiplex ers or complex cabling Signals can be compressed for transmis sion via a WAN router modems so speech signals are transmitted at data rates from 9600 baud per channel Optional communication via intercom Through the optional intercom an oper ator can report the frequency of a detected signal he cannot process to a colleague for example or to several colleagues by a group call Teamwork thus becomes much simpler Virtually any capacity Signal recording is on the local PC The capacity of modern hard disks allows continuous recording over several days or even weeks Audio squelch control and data compression contribute to long recording times without a user having fo intervene Integrated database Recordings are administered in an inte grated database FIG 3 The system automatically registers data such as recording time channel and station name Users can identify important pas sages in a recording by bookmarks comments which are stored together with their entry time Database and recordings can be bac
7. News from Rohde amp Schwarz s n m HIRED 22dddgigdaill JOE UUUUUUUI ipa R opem 3j ad ad ud od ad al a ed ad fe ee eee eee IN ITI eee is EN Lg EN Number 167 2000 1 27 Software for mobile radio conformance test systems Convenient parameter sets Instead of time consuming low level programming Conformance test systems from Rohde amp Schwarz for mobile radio support all major standards such as GSM900 1800 1900 DECT TETRA W CDMA and Bluetooth Hundreds of test cases based on the particular regulations have already been implemented But the low level interface used for programming is much too time consuming for users wanting to modify test cases or design their own To allow users to concentrate on their tasks Rohde amp Schwarz developed test types described by parameter sets that very much simplify complex procedures Why complicated Conventional development of test cases involves exact coding of the test regulation creating a program that is no longer changed once vali dated Modern high level languages eg C which are very flexible and thus suitable for all cases are used for programming But for users who want to modify supplied tests or create their own these low level interfaces are relatively complicated and time consuming So there is big demand for further functionalities beyond validated test cases because many users want to e vary test routines without any prob lems e perfor
8. and reference oscil lator Data sheet PD 757 5550 21 enter 167 19 DECT Signalling Test Unit PTW 15 can be used for mobile and stationary coverage measurements installation test network control software and hardware development as well as audio tests Data sheet PD 757 5020 2 enter 167 20 Compact Coverage Measurement System TS55 C3 Flexible field strength measurement system for stationary and mobile applications software ROMES in public GSM networks GSM railway and E GSM extended optional GPS navigation and signalling measurement Data sheet PD 757 4247 21 enter 167 21 Emission Test System T 9976 0 15 MHz to 18 GHz for standard conformant interference and spurious measurements on wireless com munication equipment in EMC and conformance testing for use up to 40 GHz Data sheet PD 757 5495 21 enter 167 22 EMS Test System TS9980 The 6 page data sheet provides more information specifications and illustrations Data sheet PD 757 1525 22 enter 167 23 Vector Signal Generator SMIQ 300 kHz to 6 4 GHz comes with new options BER measure ment and digital standard W CDMA acc to 3GPP FDD have been added Data sheet PD 757 2438 24 PD 757 4582 22 enter 167 24 Antenna Impedance Converter EZ 12 120 kHz to 30 120 MHz has been redesigned and is calibrated to the future CISPR25 standard remote controllable AM FM switchover Data sheet PD 757 5289 21 enter 167 25 Precision Halfwave Dipoles HZ 12 HZ 13 30 MHz to 1
9. case 28 News from Rohde amp Schwarz Number 167 2000 1 Test case 1 Test type Test type Test type Test type Transceiver JA transceiver receiver transmitter D Test case 29 N Test type Test type Test type Test type Transceiver transceiver receiver transmitter Ae e its dynamic behaviour special test sequence e the measurement technique how the measurement is conducted e processing and display of results Example transmitter measurements The test type transmitter measurements determines the transmitter quality of the DUT It defines the network and environmental conditions Especially interesting is the response of the DUT as a function of e transmit level and frequency e receive level e interfering signals e supply voltage e temperature and vibration position during antenna measure ments By combining different parameters special features of the DUT can be tested or a series of measurements car ried out to find associations that may reveal design problems The conven ient graphical user interface supports the user in the creation of test cases FIG 2 The transmitter measurements test type given as an example FIG 3 deter mines E m t imm el EG ERDQUMEES oss Eu ass un in ju ae e phase and frequency errors e power as a function of time for mobile radio standards with L TDMA z e modulation parameters future FIG 2 Convenient gr
10. supply voltages tuning and amplitude voltages of PLLs of oscil lators tuning voltages of harmonic fil ters module temperatures limit values and current measured value for each voltage Combined tests System Selftest All modules are tested once in consecutive order Test results PASSED or FAILED and the fault in question are indicated Internal RF LOOP Selftest The frequen cies and levels of the RF path are tested once at connectors RF1 and RF2 using the TX generator and the selec tive RX power meter with internal RF coupling All frequencies and levels are output and any limit violations marked in red Continuous Selftest Continuous test of system selftest and internal RF LOOP selftest This test was devel oped specially for the burn in cycle and is also very helpful in finding faults occurring rarely or sporadi cally Test results PASSED or FAILED and the fault in question are indicated Any faults found are logged in a spe cially created file CST ERR together with the date and time 1 gt 4 3 gt 2 RF LOOP The frequen cies and levels of the RF path are tested once at connectors RF1 gt RFAIN and RF3 OUT gt RF2 via special external N coax cables included in CMU Service Kit CMU Z3 using the TX generator and the selec tive RX power meter FIG 3 Example internal RF loop test Maintenance ti E FEESTTELEELE JT a x nam KA ILIN L Re Ee Re Re He Jibi 88888388855 Eo
11. top boxes Header 4 bytes SFQ FIG 2 The received MPEG2 transport stream is available at its common interface An adapter card is available as a recommended extra for this standard interface so that the MPEG2 transport stream can be output converted in level and the signal then applied to the parallel input TS PARALLEL AUX of SEQ For BER measurement SFQ eliminates the header from the MPEG2 transport stream and evaluates bit errors in the payload lt Payload PRBS __ 184 bytes Header A bytes data serial Payload PRBS N 184 bytes MPEG2 transport stream parallel Header A bytes Demodulated and decoded MPEG2 transport stream with bit errors The BER measurement hardware is accommodated in the DVB T module of SFQ The BER measurement software option is independent of this module however and works with transport streams of any modulation format The bit error rate currently being measured is shown in a line of the display FIG 3 The user can thus vary the C N ratio and see the measured bit error rate at the same time FranzJosef Zimmermann Payload PRBS 184 bytes Bit error REFERENCES Kretschmer Erhard Zimmermann Franz Josef Digital test signals for the television future News from Rohde amp Schwarz 1997 No 153 pp 14 16 Reader service card 167 12 News from Rohde amp Schwarz Number 167 2000 1 3
12. ttinger News from Rohde amp Schwarz Number 167 2000 II 35 Vector Network Analyzer ZVM 10 MHz to 20 GHz has the top class features of the ZVx models and extends their frequency range to 20 GHz options and extras as for the other ZVx models Data sheet PD 757 5543 2 enter 167 15 Baseband Fading Simulator ABFS generates sig nals for universal mobile radio measurement applications 1 C 2 fading channels 12 paths optional 4 or 24 noise generators optional for output and second output Data sheet PD 757 5466 21 enter 167 16 Modulation Generator AMIQ Simulation Soft ware WinlQSIM The data sheet contains speci fications relating to W CDMA 3 GPP FDD and describes the optional digital Q output as well as the AMIG03 and AMIQO4 models the latter 16 Msample Data sheet PD 757 5314 21 enter 167 17 Signal Analyzer FSIQ 20 Hz to 40 GHz for the latest FSIQ model this model and the options 1 dB attenuator Ethernet interface with RJ 45 connector and exchangeable hard disk or two have been taken into account in the revised data sheet Data sheet PD 757 4160 22 enter 167 18 Signal Generator SMLO1 9 kHz to 1 1 GHz resolution 0 1 Hz offers all the properties of a universal signal source setting time lt 10 ms level 140 dBm to 13 dBm 19 dBm over range error typ lt 0 5 dB SSB phase noise typ 128 dBc Hz AM FM qM pulse dig ital sweeps electronic attenuator options pulse modulator with generator
13. 00 kHz for demodulation and a variety of other filters up to 1 MHz for measuring level offset and bandwidth with the aid of an IF panorama Pro viding Average Min Hold and Max Hold functions as well as selectable display range the panorama is an indispensable tool in signal assessment The IF panorama is not an option by the way it is fully integrated into the basic unit since it is needed whenever you want to measure bandwidth AM FM CW LSB USB ISB PM and IQ demodulators are fitted as standard The digital concept all IF functions being merely computed allows subseguent upgrading by loading new software This also applies to filters and other functions of course should adaptation become necessary due to changes in specifications or measure ment methods FIG 4 As a stand alone ESMB is able to perform all monitor ing and measure ment tasks Photo 43 406 1 Designed for mobile use Low weight and compact dimensions mean that ESMB can easily be used in a large variety of applications In a stand alone role it is able to perform all monitoring and measurement tasks with out PC support FIG 4 The clear cut front panel makes for ease of operation allowing the user to familiarize with a minimum of effort without time consum ing study of a manual The proven oper ating philosophy of Miniport Receiver EB 200 1 was largely adopted here an extra benefit because the two instru m
14. 000 MHz The specifications of the antennas have been extended Data sheet PD 757 0387 22 enter 167 26 Web over DVB is an interactive Internet service for sending controlling managing and access ing Internet data transmission in the MPEG2 data stream IP format call up on PC via stan dard browser Data sheet PD 757 5237 21 enter 167 27 DTV IP Inserters DIPOO1 and DIPO10 enable the insertion of Internet Intranet data for standard independent transmission in the MPEG2 data stream DIPOOT requires an external PC DIPOTO has an incorporated PC Data sheet PD 757 5637 21 enter 167 28 MPEG2 Realtime Monitor DVRM can handle 26 DVB or as an option 19 ATSC measurements at the same time remote control only messages via LEDs relay contacts and interface result documentation for example available as an option Data sheet PD 757 5566 2 enter 167 29 DAB Multiplexer DM001 The STI interface and other changes are described in the new edition of the data sheet Data sheet PD 757 2580 23 enter 167 30 TV Test Transmitter SFQ 0 3 MHz to 3 3 GHz is provided with a new option for BER measure ments for the DVB T test transmitter models Data sheet PD 757 3334 26 enter 167 31 Digital Direction Finder DDF190 0 5 MHz to 3 GHz The new ADD 119 antenna 0 5 MHz to 30 MHz plus firmware version gt 2 enables 36 News from Rohde amp Schwarz Number 167 2000 11 direction finding in the HF range error 2 all the antennas can be op
15. 1 DVB T Test Receiver EFA T Innovative measurement functions for terrestrial digital TV DVB T Test Receiver EFA T FIG 1 features a multitude of measurement functions for the complex characteristics of OFDM signals thus helping to locate transmission channel problems Some of these innovative methods are already described in detail in 1 A number of new features now allow classification and analysis of DVB T signal quality FIG DVB T Test Receiver EFA T now with enhanced functionality for terrestrial digital TV OFDM modulation DVB T employs OFDM orthogonal frequency division multiplex modu lation in accordance with standard ETS300744 2 Depending on the transmission mode 1705 or 6817 mutually orthogonal carriers are sent simultaneously in a transmission chan nel 6 MHz 7 MHz or 8 MHz bandwidth Each single carrier is AQAM 16QAM or 64QAM modu lated At exactly defined intervals individual carriers called pilots are emitted unmodulated with O or 180 phase angle depending on the car rier number and at power boosted by a factor of 16 9 These pilots allow direct assessment of the quality of the transmission channel linear distor tion Linear distortion EFA T calculates the theoretical expected phase values of the pilots At the same time the actual phase values and amplitudes of the received pilots are determined The quotients of the theoretical to actual values are a measure of l
16. 8 Universal Radio Communication Tester CMU 200 was presented in No 165 This new tester is future proof thanks to its high measurement speed and modular concept The article on page 24 describes fast GSM power measurements with CMU 200 The tester s versatile selftest capabilities are ates detailed on page 26 of this issue Photo 43 238 7 Published by ROHDE amp SCHWARZ GmbH amp Co KG Muehldorfstrasse 15 81671 Munich Support Center Tel 49 01805124242 E mail customersupport rohde schwarz com Fax 49 89 4129 3777 Editor and layout Ludwig Drexl Redaktion Technik German English translation Dept 5CLA Photos Stefan Huber Circulation 90000 six times a year ISSN 0028 9108 Supply free of charge through your nearest Rohde amp Schwarz representative Printed in Germany by peschke druck Munich Reproduction of extracts permitted if source is stated and copy sent to Rohde amp Schwarz Munich News from Rohde amp Schwarz Number 167 2000 Il 3 EEE vuovuonotsn TIITIITITIITIIIITIIILIIITTIIIT L JJIIIIITITTITTTTITTIITTIITTITIII YT Litt hh htt et of ATE SSCSSSSSSSSSESESS SSCS OSES EE EES Photo 43 456 1 1 Receiver ESMB the bargain receivers were by no means lightweight Wan additional drawback in many an Receiver ESMB FIG 1 a wide frequency ectrical characteristics comprehensive compact and lightweight instrument e It is
17. EFA family except for standard specific func tions Singular versatility The new test receiver features a multi tude of innovative measurement func tions right from the basic version allow ing comprehensive in depth signal analysis In addition to measurement of general parameters such as bit error ratio BER FIG 2 more thorough analysis includes e Q constellation diagrams with selectable number of symbols to be represented eye aperture and modulation error MER EVM versus time News from Rohde amp Schwarz Number 167 2000 Il 11 e calculation of transmission param eters like pilot carrier e amplitude spectrum of user channel e linearity analysis from histogram of amplitude distribution e complex channel transmission function e received echo signals ghost pat tern Any failures and degradations are vis ible straight away from the constella tion diagram FIG 3 Effects of interest can be located more precisely by vary ing the number of symbols represented A particularly effective method here is presentation of eye aperture as a function of time Eye apertures plus decision thresholds are displayed on a largely user selectable scale reveal ing for example periodic transmis sion errors or individual interferers at a glance and allowing immediate identification Trend analyses too are possible with this method The integrated spectral analysis func tion enables simple exa
18. MPEG2 transport stream No extra digital transmission tester is necessary Signal generation 30 and evaluation can be fully remote controlled Quasi errorfree In digital television to DVB specifi cations measurement of the quasi errorfree QEF point at a defined receive level has proven to be espe cially important QEF means a BER FIG 3 Permanent display of measured BER News from Rohde amp Schwarz Number 167 2000 Il of 2x 10 4 before the Reed Solomon decoder White Gaussian noise is added to the useful signal and BER is measured before the Reed Solomon decoder at different noise levels C N settings The deviation of the mea sured from the theoretical curve is then determined at the QEF point to obtain the equivalent noise degrada tion END which is an important receiver parameter What was previously only possible with a special configuration is now done by SFQ quite simply BER measured direct in an MPEG2 transport stream For this purpose SFQ provides a NULL PRBS PACKET signal before the FEC forward error correction in the coder in which a pseudo random bit sequence PRBS is packeted as the payload in an MPEG2 transport stream Example set top box The settop box demodulates and decodes the RF signal generated by Internally generated MPEG2 transport stream NULL PRBS PACKET Oe ma m gt Header 4 bytes 184 bytes FIG 7 Principle of BER measurement on set
19. Noise Measurement Soft ware FS K3 invests these high grade analyzers with characteristics that are otherwise only obtainable in special purpose noise test systems The follow ing parameters can be measured e noise figure in dB noise temperature in Kelvin e gain in dB The software runs on a commercial PC with the Microsoft Windows 3 1 95 98 NT operating systems An IEEE IEC 625 1 interface is required for measurement In the case of ana lyzers including the controller function FSE B15 or FSIQ the application can run in the particular unit without the need for a PC Settings for the measurements are per formed via the software and can be stored on a data medium Results can be exported in the form of WMF DAT or TXT files for further processing by other programs Users who already have the predeces sor version FSE K3 will receive a free upgrade and can take advantage of the extended functionality Noise figure and gain of mixers A frequent problem when measuring the noise figure and gain of mixers is that the broadband noise of com mercial noise sources is not only con verted into the IF at the required input frequency but also at the image fre quency The noise power addition ally converted at the image frequency causes a measurement error that can vary by proportion One way of avoiding this error is to use a filter with which the input noise at the image frequency is strongly sup
20. Receiver EB 200 Following an interesting lead in animation you see EB200 emerge step by step from the drawing board to become the finished receiver the main menu offers you a wide choice of subjects First time round though you should work from the top down The Tutorial tells you all about startup recep tion direct functions and freguency plus memory scan Here you can learn how to handle the device just like in conven tional training Under the next menu item Operation you can try out what you know virtually on the receiver Back channel Domin N T DAB n z Transceiver REFERENCES 1 Fraebel Michael Vielhuber Robert Soft ware based radios for professional use News from Rohde amp Schwarz 2000 No 166 pp 8 9 2 Kneidel Thomas When the PostMan rings on Internet News from Rohde amp Schwarz 1997 No 153 pp 28 29 which is simulated with all its functions Test finds out what you know about EB 200 and what you can do with it The results tell you how good you are and what you may need to repeat to get better Click on Documentation and you can read the data sheet specifica tions and manual a presentation of all information relating to EB200 and a profile of Rohde amp Schwarz This virtual workshop offers both users of Miniport Receiver EB 200 and those interested in it a simple way of finding out how to operate the device or make even better use of it Stefan B
21. The focus at the show was on new gener ations of test equipment for digital technologies and on medium power transmitters The compact air cooled transmit ters of the NH NV7000 family with LDMOS transistors and integrated analog or OFDM 8 VSB coder are designed for digital television from 100 W to 800 W and analog television in the range 250 W to 2 kW They allow precise and efficient coverage even of small areas The exciter is modular mean ing that the transmitters can be reconfigured from analog to digital TV DVB T ATSC by German Navy successfully trials PostMan As part of a series of short wave trials called PC Net the German Navy used the Post Man communication software from Rohde amp Schwarz for the first time early in 2000 With the aid of PostMan it was pos sible to set up a wireless TCP IP simply replacing the encoder module Among the highlights was the ATSC Test Receiver EFA the world s first realtime TV test receiver for digital TV see pages 11 and 37 With the new MPEG2 Recorder Generator DVRG transport streams to ATSC and DVB can be recorded decoded newly multiplexed and generated The new TV Test Transmitter SFQ produces RF signals for ATSC the North American terrestrial digital TV standard In addition to its own showing Rohde amp Schwarz was also rep resented on the stand of its US partner Acrodyne The teaming up of the two transmitter produc ers has been well rece
22. and remedied fast by replacing the module concerned Nor mally of course no faults will be detected in the selftest showing that your CMU 200 is working perfectly this is ensured alone by early diagnosis in production Roland Mahr To find out just how fast CMU200 can mea sure the power of GSM mobiles look at pages 24 25 Reader service card 167 10 Maintenance b Terung REF Biwa Emu Cost a biam arie Riana RF Loe Test Wl mor aes Sole DM i es oe dal ab Tun Fal Pipi mas NI Sete krri EF Fen e far otan Goer e 26 News from Rohde amp Schwarz Number 167 2000 1 Denese HT Liege un FE Tainan d id Module tests Any tolerance violations are marked in red FE Selftest RF FRONTEND Output of defined supply voltages and logic switching voltages limit values and current measured value for each volt age REF Selftest REFERENCE BOARD Output of defined tuning and ampli tude voltages of PLLs at different fre quencies output of supply voltages and module temperature limit values and current measured value for each voltage DIG Selftest DIGITAL BOARD Out put of defined supply voltages and frequency proportional voltages of clock signals limit values and current measured value for each voltage FIG 2 Example REF selftest Maintenance 528388925 amp a UE uc ur ee 40 D CMU 200 selitest RXTXI Selftest RXTX BOARD Out put of defined
23. aphi For result analysis it displays the fol n a interface lowing FIG 4 ist of all test steps to be performed e phase and frequency error as MEE in re maximum and average value ground e average power of transmit signal e burst form Users can freely select the above men tioned parameters They can use con formance tests already supplied by Rohde amp Schwarz normally sampling tests and thus a small subset of the com plete test range and modify a copy of them Creating new test cases within the given test types is also very simple Preset defaults help and support the user in the first steps This powerful open interface places high demands on the system software since it must be able to offer functions measurement stimulus and compensa tion methods to handle this variety of FIG 3 functionalities and implement them cor Example of RF S NE type for transmitter rectly for the complex test system This is aa endi a real challenge but Rohde amp Schwarz is backed up by many years of experience in all fields of mobile radio measure ments Application software is supplied together with the test cases and combines high grade measuring instruments for a vari ety of uses Users can fully concentrate on the measurement task itself and the optimization of DUTs from develop ment through to conformance testing Detlef Wiese FIG 4 Overview of test oo results for success Reader service car
24. asurement technology to the new ATSC Test Receiver EFA from Rohde amp Schwarz at the NAB2000 show page 38 The test receiver won the prize for its inno vative concept and modern technology EFA can simultane ously receive ana lyze and demodulate 8 VSB modulated pic ture data the trans standard adopted for digital mission television in North America The Star Award is presented just once a year to the most innovative products exhibited at the NAB show in Las Vegas Articles in this issue on ATSC EFA page 11 and EFA T page 32 Stefan B ttinger m cmm AES LUI AS i Digital broadcasting of TV signals by MPEG 2 is on the increase In addition to transmission media like satellite and cable terrestrial broadcasting networks are in the process of being set up in many coun tries or are planned for the near future Rohde amp Schwarz offers numerous solutions for these requirements News from Rohde amp Schwarz Number 167 2000 II 37 NN Taas NAB Rohde amp Schwarz with allround assortment At the world s biggest show for broadcast technology the NAB which was staged in Las Vegas from 10 through 14 April Rohde amp Schwarz presented its entire range of transmission and measurement equipment The effort was worth it the large number of visitors to the stand and numerous contacts proved how much interest there is in the company and what it has to offer
25. d Transmitter lists can also be extracted from databases for example Since the location of a transmitter is often known ArgusMon can align rotat able antennas towards the transmitter and then measure Practice proven user manual The new user manual was developed in close cooperation with experienced customers It explains step by step the commonest typical measurement tasks in radiomonitoring and how to solve them with the ARGUS software pack ages Further improvements in brief e Level cannot only be measured in dBpV and dBpV m but now in all other common units e A new graphical window shows freguency band occupancy during a measurement in realtime FIG 5 e An auxiliary icon bar shows the current location and alignment of the test vehicle at a glance if a GPS receiver and compass are connected FIG3 Bearing measurement mode Mee 89 3 o is Ri Li News from Rohde amp Schwarz Number 167 2000 Il 19 Software en m ho m m call pe Gm m pusu 01844797 OBEN Bh jenii d EIL en ee pos odd ue pees Pere bee A cae Ci rn E ima tdm eC EMA LA eE i O W Sid ge ES 1 N 4 97 De pem pen Cee ie ocom msmmmuumum oa Diss 20 News from Rohde amp Schwarz Number 167 2000 11 FIG 4 Automatic measure ment mode FIG 5 Frequency band occupancy can be visualized in real time during mea surement FIG 6 Frequency channel statistic
26. d 167 11 ful analysis News from Rohde amp Schwarz Number 167 2000 1 29 TV Test Transmitter SFQ Bit error rate measurement on set top boxes Bit error rate BER can be measured at different points on set top boxes for digital television A BER instrument must be able to accept and evaluate data in serial or parallel form or as the payload of an MPEG2 transport stream This is no problem with TV Test Transmitter SFQ FIG 1 and its BER measurement option while the necessary signals are generated at the right places in the signal flow BER is measured at the same time Together with an optional noise generator and fading simulator SFQ is also able to simulate the interference occurring in Photo 42592 2 real life transmissions in a reproducible way FIG1 TV Test Transmitter SFQ produces highly precise standard test signals that can be varied and generated with predefined errors to deter mine the performance of products at their operat ing limits No need for special transmission testers Reproducible measurement of BER under defined conditions is an informa tive and important measurement when you want to assess the quality of digital transmission methods and the compo nents involved TV Test Transmitter SFQ features comprehensive BER capa bility it evaluates data from receivers settop boxes or demodulator chips in serial form as data and clock or in parallel form as a PRBS sequence or as the payload of an
27. dows NT operating system a second network card and an Ethernet cable for con nection to CRIx CRIx in turn must be fitted with option CRT B3 network card for connection to PSM Phase2 Operational Software CRO2P2P provides full circuit switched functionality for GSM Phase2 Part FIG 2 Structure of GPRS protocol stack 2 of the software package is installed on CRTx and part on PSM Software option CRGPRS1 incorpo rates functionality for the GPRS phys ical layer and RLC MAC layer in the unacknowledged mode Software option CRGPRS2 adds acknowledged mode to the RLC MAC layer pro vided that software option CRGPRS1 is installed Software option CRGPRS3 comprises the higher protocol layers LLC and SNDCP It is installed on PSM and requires one of the options CRGPRS1 or CRGPRS2 integrated in CRTx Several packages CRTKGxx are also available containing GPRS test cases implemented according to ETSI speci fication GSM11 10 1 Patrick Kolligs Reader service card 167 04 REFERENCES 1 Segerer Franz HSCSD test software for GSM Phase2 Measurement software and test cases for new fast GSM data ser vices News from Rohde amp Schwarz 1999 No 163 pp 28 29 2 GSM 04 64 version 6 7 0 release 1997 ETSI TS TOT 351 MS Um BSS Gb SGSN News from Rohde amp Schwarz Number 167 2000 Il General packet radio service GPRS GPRS is a third generation data service set up on mobile radio netwo
28. e amp Schwarz 1999 No 165 pp 4 7 Reader service card 167 09 FIG 5 CMU200 measures power through all PCLs of mobile on three different GSM channels in just two or three seconds 25 Digital Radio Communication Tester CMU 200 Selitesting CMU 200 Modern measuring instruments are not only expected to be fast and accurate the user also wants high reliability and above all long calibration intervals Should any repair ever become necessary accurate fault diagnosis helps to keep servicing times to a minimum and makes for increased instrument availability Universal Radio Communication Tester CMU 200 consequently integrates elaborate selftest facilities allowing fast checking of its basic functions Extensive selftests as early as production CMU 200 selftest functions are exten sively used during its production The first selftest is carried out after assembly and interconnection of all the unit s modules In this way possible faults are detected before the instrument is sub jected to a five day burn in at tempera tures varying between 5 C and 45 C During this time a continuous selftest is run in CMU200 Any faults detected are logged in a file This reveals both non recurrent faults and those appear ing at certain temperatures Such a procedure detects faults at the earliest possible stage so that only good units are subjected to further checks and tinal testing thus considerably reduc ing measurement time and cost
29. e arrival of GPRS has added multiple complexity to the GSM standard espe cially with regard to the protocol stack This places stringent demands on the performance and flexibility of a GPRS test platform which CRTx meets by hardware and software extensions To meet elevated performance require ments CRTx is supported by Industrial Controller PSM FIG 1 The two units communicate on a standard Ethernet link The more time critical lower pro tocol layers physical layer and RLC MAC run on CRTx the higher layers LLC and SNDCP on PSM FIG 2 The system as a whole is operated from 14 News from Rohde amp Schwarz Number 167 2000 11 FIG 1 Flexible platform for GPRS test scenarios Digital Radiocommunication Test Set CRTx and Industrial Controller PSM PSM using the Windows NT operat ing system GPRS test applications are pro grammed via a powerful API which allows each protocol layer to be checked In addition a reference imple mentation of the complete GPRS proto col stack is available for testing GPRS based applications RF measurements like block error rate BLER are imple mented too As regards multislot opera tion CRTx supports a maximum of four timeslots uplink and downlink 4 4 The system is consequently suitable both for applications in the develop ment of GPRS systems and conform ance testing of mobile radio stations PSM must be equipped with option B10 comprising the Win
30. e to be processed Now a new member has been added to the family the DVRG generator platform FIG 1 This unit is quite unique generating the entire spectrum of digital TV signals while occupying minimum space In addition to recording and replaying MPEG2 transport streams DVRG can optionally process uncompressed SDI video streams of 270 Mbit s Additional software packages open up a wide range of applications capacity for recording and replaying MPEG2 transport streams DVRG offers outstanding characteristics The supplied transport stream library con right in its basic version Featuring com tains predefined signals for many applica pact design of only two height units tions and test cases This library famil DVRG offers up to 36 Gbytes of storage iar from DVG and much appreciated Photo 43 401 3 News from Rohde amp Sc FIG 1 Only two units in height yet easy to oper ate via the front panel DTV Recorder Generator DVRG Em KN E m E T bm ig Hj i AE I pia LLL Gam A AY aay a AEF 4p LZ Z EDADA EDLA AT TCI ry N rary a amma a FIG 2 Compact test station for error analysis by users is continuously expanded by Rohde amp Schwarz to match new require ments and developments in the TV indus try An integrated CD ROM drive makes it easy to download signals And an optional CD burner is available for archiving recorded streams A tri
31. ents are offen used together Easily understood menus allow simple adapta tion of ESMB to different tasks reduc ing operator error to a minimum Used in a mobile role not only ESMB s compact size but also its low power consumption is a special benefit par ticularly for the vehicle s battery Communicative within a system Controlled from a PC on its modern Eth ernet interface ESMB demonstrates alll its functionality Rohde amp Schwarz offers Measurement Software ArgusMon 2 for this purpose see also page 18 With the aid of this software all func tions can be controlled results quickly and clearly displayed and if wished data recorded the volume only being limited by the capacity of the stor age medium Despite its versatility ArgusMon is quite simple to handle The user interfaces shown in FIGs 5 and 6 are only a fraction of the many possibilities An RS 232 C interface can optionally be fitted instead of the Ethernet inter face This interface is sufficient for simple remote control applications with out exacting speed requirements Use of ESMB in conjunction with Digital Direction Finder DDF 190 from Rohde amp Schwarz 3 4 produces a small scale system that is almost unparalleled in terms of functionality and compactness and that is able to perform practically all tasks in signal detection monitor ing and measurement FIG 1 Suit able Argus drivers are of course avail able for combination wit
32. erated simultaneously Data sheet PD 757 1460 24 enter 167 32 Microwave Directional Antenna AC008 1 GHz to 26 5 GHz The extended frequency range of the HLO25 feed made a new edition of this data sheet necessary Data sheet PD 756 5633 23 enter 167 33 Series200 Single Channel Communication System 118 MHz to 144 MHz 225 MHz to 400 MHz Many specifications were outdated due to ongoing technical development Data sheet PD 757 0241 25 enter 167 34 D Channel Filter ISDNwall A model with So inter face for connecting several instruments is offered by Rohde amp Schwarz SIT GmbH Data sheet PD 757 3770 23 enter 167 35 Rohde amp Schwarz electronic workshops Your way to independence in maintenance and repair is presented by R amp S Cologne Plant in this brochure customized stationary semi mobile and mobile test shops especially for applications without standard solutions Info PD 757 5508 21 enter 167 36 New application notes Bit error ratio BER in DVB as a function of S N Appl 7BMO3 1E enter 167 37 Program for frequency response measurements FreRes Appl 1IMAO9 4E enter 167 38 Calibrating the CMD output level for BER Appl IMA24 OE enter 167 39 W CDMA signal generator solutions by Rohde amp Schwarz Appl 1GP39 OE enter 167 40 Schz TAC Photos author Into the Bluetooth era with Rohde amp Schwarz MOBILE europe a European journal for wire less communication decorated the cover of it
33. ers in corresponding measurement menu Simultaneous analysis measurement of key parameters ideal for monitoring tasks ATSC YS5B MEASURE CENTER FREG 30 dB 400 000 MHz 1 2 dBm HDDULATTOH COUHSTELL DIAGRAM FREQUENCY SET CENTER FREI S00 MHz SET PILOT FRE 297 MHz FILOT FEREG OFFSET ir ok SET SYMBOL FATE SYMBOL FATE OFFSET FREGQUEHMCY DOMAIN TIME DOMAIN BER BER BEFORE VIT 0 0E 10 lt 1K80 BER BEFORE RS 0 0E 10 BER AFTER RS BVSe FARA METERS RESET BEF TS BIT RATE ADD MOISE OFF ATSC YSB NHEASURE CONSTELL DIAGRANM 10000 SYMBOLS PROCESSED SYMBOL CHT 10000 HOLD FREEZE OH ADD MOISE specific amplitude level eight levels Synchroniza Everything for ATSC from Rohde amp Schwarz tion data segment sync field sync are added to the coded signal for data recovery in the receiver Remains SIEG error correction channel equalizer For carrier Wr toma sf News 166 SFQ goes North American with digital TV standard ATSC recovery in the receiver the unmodulated carrier is added to the 8VSB signal as a pilot To make UHF the most efficient use of the available bandwidth Ligirenlet TV transniters for my Transmitter only one sideband of the AM modulated signal is E i CUP e transmitted vestigial sideband suppression Prior N L News 165 to emission the modulated signal is shaped by a on a 0 rootcosine rolloff fi
34. etection acquisition assess ment and classification These include special features like frequency scan memory scan IF panorama or RF spec trum with the DIGI Scan option FIG 3 the latter often being the only means of detecting signals This option features scan rates up to 800 MHz s in other words about 10000 channels s with 150 kHz bandwidth Lean digital ESMB uses highly advanced digital signal processing Digital technology is not only employed for the measure ments mentioned above but for the entire IF processing Such a large vari News from Rohde amp Schwarz Number 167 2000 Il 5 FIG 5 Scan with 3D water fall display KH pa IL FIG 6 H N d F kh k d au hmi 5 i E 5 TT TE E e LL ee 4 Modulation and PSE m bandwidth measure ment with pan H A Peine Ln ni Hu oramic display E m Po bab Raus na FE Pun mi ma Pee A man I H ss O ROHDE amp SCHWARZ MONITORING RECEIVER 9kHz 93 300 000 AODOKHZ jia DISPLAY a rer 2222222222222222222 no 00000000000000000000 00000000000000000000 eeccccocce L gom n News from Rohde amp Schwarz Number 167 2000 11 J6GHz ESMB IER ee Du ew os 0000000000 ES E ES E Ma ety of functions would never have been possible on an analog basis because of the forbidding space requirements ESMB has 18 IF filters from 150 Hz to 3
35. ful part In the production of GSM mobile phones peak power measurement is sufficient in many cases It allows for example very fast adjustment of a mobile followed only by a com pliance check of the power versus time template CMU 200 comprises power meters of different bandwidths to perform such peak power measure ments Power versus slot But this is by no means all this fast new tester has to offer Another impor tant measurement is power versus slot FIG 3 which is of interest in particu lar in testing multislot mobile phones Here CMU 200 measures the average power of eight successive timeslots in realtime It is not possible to carry out GSM conformant power measurement and template verification in such a short time so the tester only evaluates part of the power ramp and from this cal FIG 3 Power versus slot measurement determines power in all eight timeslots of a frame an interesting function for multislot mobiles ECT msc meme 20 F 3 oh oa aT Dy lal sdp FIG 4 Hopping in fre quency CMU 200 changes power Multiframe from highest through to lowest power control level PCL All PCLs are measured in one go culates the average power The train ing sequence is not determined in this measurement nor is the power versus time template checked Experience has shown however that results obtained in this way are usually sufficient in GSM
36. g home banking travel booking and point to multipoint eg news traffic infor mation The first mobiles supporting GPRS are expected to become available late this year 15 GH 127 AllAudio Digital recording distribution and management of audio signals in radiomonitoring systems GH 127 AllAudio is PC based software for simultaneous digital recording of audio signals from up to 16 channels and their distribution via networks An integrated database for data backup and an export function support management of record ings An optional intercom makes for easy teamwork _ 0F FT Q OUT3 e 1 Headphones Loudspeaker va TB eH H Playback Advantages through digitization Conventional radiomonitoring systems use different analog components to process audio signals such as e switching matrixes e recorders e distributors splitters amplifiers e multiplexers e intercom All these components can be imple mented much more flexibly and cost efficiently on a PC by software GH 127 AllAudio digitizes all audio signal sources via multichannel sound cards and can distribute record play back and store digitized signals Possible sources are the audio outputs of receiv ers microphones or IF outputs up to FIG 1 Switching diagram of soft ware matrix Each coloured module is available several times inputs IN WAN LAN same number as con fig
37. gger input simplifies the selective recording of video streams Transport streams can be recorded before after or right at the time of an event so that even rare errors or events can be reliably documented and analyzed FIG 2 Beside these characteristics DVRG is also compatible with the widely used MPEG2 Generator DVG from Rohde amp Schwarz This makes for good economics because all signals generated for DVG can be transferred to DVRG unmodified Conversely sequences generated by DVRG can be downloaded to DVG and replayed there Another strong point of DVRG shows in continuous operation Free RAM capacity MPEG2 transport stream TS DVRM DVQ DVRG Stream Explorer TS stream analysis Quality Explorer video ES analysis is automatically used for signal output This means that shorter image sequences can be output without requiring any hard disk capacity Robust operating system and comprehensive software packages The Windows Embedded NT oper ating system is the powerful motor in DVRG This robust version of the Windows NTTM 4 0 operating system known from the PC world also allows the unit to be powered off in ongo ing operation This does away with tedious shutdown an aspect that will be appreciated by many users The main advantage however is that reli able booting is ensured even after a power failure an important feature especially in production Connecting a keyboard mouse and monitor tu
38. h DF equip ment Thanks to its modern interfaces and standardized command syntax ESMB is easily integrated into large monitoring systems Use in unattended measurement stations is no problem either since all results including the data for spectrum display are available at the interface Premium in reliability and serviceability The low power consumption and the well devised thermal concept ensure high reliability even where space is at a premium Should any fault occur the intelligent test concept BITE is a valu able aid in troubleshooting Out of4ol erance conditions are signalled acous tically and optically and the defec tive module is immediately identified Replacement is quite straightforward reducing downtime to a minimum Condensed data of ESMB Frequency range Measurement functions Demodulation Filters Scan functions Interfaces Power consumption Weight Dimensions WxHxD Reader service card 167 01 Designed for the future Simple downloading of new software and additional free slots for hardware extensions provide sufficient reserve capacity for subsequent upgrades With its future oriented technology ESMB gives the user a tool that can always be kept right up to the state of the art Christian Gottlob REFERENCES 1 Klenner G nther Miniport Receiver EB 200 and Handheld Directional Antenna HE 200 Radiolocation from 10 kHz to 3 GHz now with portable equipment News from Rohde
39. he implementation of elec tronic documentation and cataloging of spare parts H PAEH E Hur hiia Grot heira Trinia hates 7 era Drga Heinz Peter Olbr ck J rg Zorenb hmer REFERENCES 1 Zorenb hmer J rg Technical documenta tion by high tech methods News from Rohde amp Schwarz 1999 No 162 pp 16 17 2 Olbr ck Heinz Peter Database supported information management News from Gn ppf msi deem dee ere ec eee ap er ed ee du a lisissa ohan lt E roll fel ere TTT F Rohde amp Schwarz 2000 No 166 pp E 20 21 FIG 3 Wide range of functions in familiar software environment eg full text research in Reader service card 167 07 Microsoft Internet Explorer 22 News from Rohde amp Schwarz Number 167 2000 1 Noise Measurement Software FS K3 Noise test system with FSE FSIQ or FSP analyzers The noise figure and the gain of a DUT can be measured highly accurately with the new Noise Measurement Software FS K3 and a signal or spectrum analyzer of the FSE FSIQ or FSP family The result is a noise test system that is substantially superior to a conventional test setup High grade noise test systems Spectrum Analyzers FSE and FSP and Signal Analyzers FSIQ from Rohde amp Schwarz featuring high sensitivity and level accuracy are together with switchable and calibrated noise sources ideal for performing auto matic measurements of noise figure and gain
40. hed by Germany s minis try of the interior the BSI tool News from Rohde amp Schwarz Number 167 2000 Il Photo author Newsgrams Deputy Minister of Communica tion Dasho Leki Dorji was very satisfied with the performance of ARGUSIT J rg Pfitzner Software for ARGUS IT see page 18 in this issue Spectrum monitoring on the high est passes of Bhutan Pele La at 3400 m altitude from Rohde amp Schwarz is recom mended as being especially suit able for protecting IT systems against denial of service on the Internet Stefan B ttinger 39 Visit us on Internet at www rohde schwarz com Sune amp SCHWARZ ROHDE amp SCHWARZ GmbH amp Co KG Muehldorfstrasse 15 81671 Munich Germany P O B 801469 81614 Munich Support Center Tel 49 01805 12 42 42 E Mail customersupport rohde schwarz com Fax 49 89 41 29 37 77 News from Rohde amp Schwarz 167 2000 II PD 757 5350 21 B42622
41. highly detailed presentation of results This measurement is used on the one hand to show the channel impulse response caused for example by reflec tions from buildings mountains and other obstacles But it also serves for monitoring synchronization in single frequency networks SFNs The SFN technique allows network operators to operate all transmitters at the same frequency for broadcasting a DVB T signal from several sites This requires highly precise time synchronization of the different transmitters however To verify synchronization EFA T can present channel impulse response as a function of both time and distance conversion to kilometers or miles Amplitude distribution of nonlinear distortions DVB T signals displayed on an oscil loscope cannot be distinguished from Gaussian noise These signals are known for their very high crest factor Monitoring the amplitude distribution of these signals is particularly important for the transmitter operator for two reasons which should be carefully weighed up against each other On the one hand nonlinear limitation of the transmitted signals increases spurious emissions because of inter modulation between the OFDM car riers so adjacent TV channels may be affected For this reason a high crest factor of the transmitted signal is aimed at On the other hand too high a crest factor in conjunction with effective use of the available transmitter power can considerably
42. ic unit eg with the 64 kbit high performance modem for radio data transmission with high bandwidth efficiency Modem implemented by software The new 64 kbit modem is entirely implemented as software on one of the digital signal processors of the radio This allows future extensions or matching to special applications through a simple software upgrade The new method makes considerably better use of scarce frequency bands than conventional solutions Encryption of communication is just as straight forward as changing to other com munications standards eg from ISDN through TCP IP LAN links to mobile radio networks The new modem has vast potential stills video sequences and fast data base queries are now also possible during mobile use That makes it a must for the military as well as gov ernment authorities and organizations with security missions such as police forces fire fighters and border patrols In addition it is ideal for mobile data acquisition and information systems FIG 1 Radio data by soft ware modem shows how flexible DF networks with data rates of 64 kbit s for bearing and control data portable control units as well as remote access applications The box below illustrates how the modem meets the special requirements encountered in mobile use Mobile radio data must meet special requirements In contrast to fixed transmit and receive equipment radio data units for mobile use face addi
43. inear distortion in a trans mission channel at a specific frequency All values of the pilots together give the channel transmission function The special point about this method is that all calculations are complex ie with real and imaginary components yield ing complex results So EFA T outputs not only the amplitude response of a transmission channel but also its phase response The frequency axis is freely selectable and the amplitude phase axis automatically adjusts to 32 News from Rohde amp Schwarz Number 167 2000 11 the range of values obtained FIG 2 Group delay can now be determined by means of a simple conversion func tion of EFA T Polar plot in complex plane The conditions prevailing in a transmis sion channel can be assessed at a glance by representing the complex values of pilots in the complex plane While this representation is not refer enced to freguency it offers straightfor ward phase and amplitude information in a single diagram FIG 3 Channel impulse response The channel transmission function and the channel impulse response are linked to each other via the Fourier transform EFA T performs an inverse Fourier transform IFFT to determine the channel impulse response whose main signal at t O and echoes are graphically displayed FIG 4 This measurement is performed with very high precision so the zoom function of the receiver is particularly valuable in this case allowing
44. intended as a monitoring receiver mmendations and for use in the entire Y FIGs 2a to 2d All measurements in line with ITU recom mendations RMG 0 SPAN 300 KHZ 105 700 DU 93 0 RAS Rx COMF 2a bandwidth 2b to 2d modulation Mi MAX GET lt de 5888 CONFIG gt T RF panoramic display with DIGI Scan option 3 KHZ AM Mec OFF Sau OFF TONE FF FRG AUTO MOD DEFTH 39 8 398 Bas x AFC FREQ DEW 0 036 4 0 036 0 037 EHZ FHASE DE 20 KHZ HIN Moc OFF sau OFF TOME OFF FR AUTO HOD DEFTH 33 3 236 324 FREQ DEM 44 77 44 77 44 77 KHZ FHASE DEW RAD IIE 20 KHZ FM Moc OFF sau OFF TOME OFF FRA AUTO HOD DEFTH 3 3 FREQ DE FHASE DEM 3 35 200083 150 000 EEDEN FRA ITU conformant measurements ESMB can perform all measurements in line with ITU recommendations such as frequency and frequency offset field strength modulation parameters band width and frequency occupancy with PC FIGs 2a to 2d For bandwidth measurement both XdB and the more universal B method can be adopted A special benefit is that parameters can be measured simultaneously so time requirements are cut to a minimum The time needed for this kind of procedure can otherwise be quite bothersome when a whole series of measurements has to be carried out Before it actually starts to measure sig nals important functions in ESMB sup port their d
45. introduction of digital TV in the United States was the allocation of additional 6 MHz channels for the parallel trans mission of digital TV programs by all the approximately 1600 broadcast sta tions This made it possible to operate Photo 43482 1 simultaneously on digital and analog channels during the transition period Another milestone was the definition of a tight time frame by the legislation compelling stations to start broadcast ing digital TV signals in good time The first digital programs were transmitted on schedule in November 1998 To date May 2000 some 120 stations are on air with digital programs provid ing coverage for about 60 of the US American population By late 2002 all commercial TV stations are to follow It is planned to shut down all analog channels by the end of 2006 EFA characteristics ATSC Test Receiver EFA fully compati ble with the ATSC Doc A 53 standard receives demodulates decodes and analyzes VSB vestigial sideband sig nals All major parameters for demod ulating the receive signal can be selected automatically or manually e 8VSB modulation e trellis decoder code rate 2 3 e variable symbol rate for special modulator tests and lab analysis e Reed Solomon error correction 207 187 10 e filter bandwidth 6 MHz option ally 2 MHz and 8 MHz The operating principle of the new receiver is largely identical with that of the other receivers of the
46. ion blocks allow ing early detection of any problems Detected transmission errors are saved in the test receiver together with the date and time in error reports compris ing up to 1000 entries In addition it triggers an acoustic alarm Use as relay receiver For this special application EFA is simply optimized for reception at a keystroke This allows reception even under adverse operating conditions The user is also able to configure the bandwidths of the main amplitude and phase control loops Christoph Balz Mathias Leutiger Ernst Polz Further articles on Test Receivers EFA on pages 32 and 37 of this issue 12 News from Rohde amp Schwarz Number 167 2000 11 SVSB ATSC modulation for terrestrial broadeasting of digital TV signals The ATSC standard employs 8VSB 8 level trellis coded vestigial sideband discrete amplitude mod ulation Here the incoming data stream at the transmitter is applied to a data randomizer Reed Solomon encoder and data interleaver divided into packets of two bits and because of the 2 3 code rate coded to produce data packets of three bits in a Viterbi convolutional encoder trellis encoder Each group of three bits symbol represents a Captions to FIGs 2 through 6 Measurement menu all important data visible at a glance Constellation diagram here representing 10000 symbols Spectral analysis of 8VSB signal by means of FFT Display of calculated 8VSB transmission paramet
47. ists stored in ASCII format can be integrated as simply as graphical presentations and photographs Systematic structure for fast searching An SPC has a user friendly hierarchy like the corresponding hardware struc ture resulting from design or integration FIG 1 Individual startup pages lists of contents product groups or equipment family overviews help you to quickly get where you want You familiarize quickly and intuitively with a unit or system Electronic SPCs reduce the documenta tion carried by someone in the field service to a single CD ROM Even electronic SPCs cannot always be up to date which is where an amend ments service helps providing the latest information and changes via diskette CD ROM or straight from the Internet for daily actuality SPC functions Presentation and navigation in Internet browser Use of standard software eg Microsoft Internet Explorer TM simplifies intuitive working because you find the familiar Microsoft Windows environment An SPC makes use of the standard func tions forward and backward naviga tion bookmarking by favourites etc and other functions can be added by Java scripts Very many configurations are possible so a customer s own cor porate identity can be created Further functions or links to other applications are easily integrated Sophisticated search functions Searching for individual parts is extremely simple This can be done by selecti
48. ived in the USA and already resulted in initial joint projects and con tracts In the words of a seasoned sales engineer who really knows the show The best NAB ever Stefan B ttinger link between a submarine and a land based LAN on short wave The radio link enabled an exchange of e mails using COTS commercial off the shelf e mail programs PostMan will also implement other TCP IP appli cations by radio as was dem onstrated by an intranet access with standard browsers Thomas Kneidel 38 News from Rohde amp Schwarz Number 167 2000 1 Competent on the spot service in Asia In the capital goods sector in particular customer satisfaction depends very much on being able to offer fast and first class service For this reason Rohde amp Schwarz is implementing an expanded multistage concept with its Asian representatives in the 1999 2000 business year that will upgrade the service sup port centers in the various coun tries to meet the bigger demands of the market for calibration repair and spare part logistics Categorization will also provide customers with a clearer pro file of the individual support centers This means auditing Rohde amp Schwarz s Asian support cen ters and organizing them into performance categories accord ing to training eguipment inven tory service processes and pro files The categories range from basic support First Line Bronze through standa
49. ked up on tape and restored FIG 3 Recording data base selected recording sessions consist of several files in WAV format Some positions of recording session are characterized by bookmarks Session is played when clicked at cor responding position ait Amie Pt N i Zw ame Zi War ECI OER Nd E i 1000001153 ei TE OE PA XR ETI abbr 11 14 07 C2 15 0100 Hu TKTT D COATS OO oe in Tet of targa aura a ibis rama andi dcm 1 GA OD 170308 Backup may delete recordings while management information in the data base is maintained on the PC The user can thus see all recordings When accessing archived recordings he is told on which tape to find them In touch by remote control Several remote control possibilities are integrated e stations with GH127 can remotely control other workstations with GH 127 to start or stop recordings e monitoring software eg Rohde amp Schwarz RAMON or ARGUS see page 18 of this issue can activate audio output of a receiver control the volume etc FIG2 Audio distribution 2 channels switched for listening Distribution local MITT an I Muting Volume HI Recording Playback Balance Bookmark Analysis outputs CH x HIE SHL te mill 5 L Loss Distribution network data buffer 60 s E m News from Rohde amp Schwarz Number 167 2000 Il e switching statuses of outputs can be queried so that res
50. level BER MER EVM SNR pilot carrier level pilotcarrier frequency symbol rate Graphical displays I O constellation amplitude spectrum echo signals ghost pattern complex channel transmission function amplitude distribution eye pattern history Output signals SMPTE 310 MPEG TS SPI ASI Options RF preselection EFA B3 SAW filter 8 MHz 2 MHz EFA B13 B14 FREGUEHMCY DOMAIH TRANSHISSION TIME PHASE JITTER RHS Clr DOMAIM SIGHAL WOISE RATIO 41 5 dE ADD MOISE OFF ATSC YSB ALAR CONFIG CENTER FREG CHANNEL ATTEH 30 dB 400 000 MHz 1 2 dBm DISABLED EHAELED DISAELED BEF BEFORE WIT BEF BEFORE RS Reader service card 167 03 MPEG DATA ERROR DISAELED News from Rohde amp Schwarz Number 167 2000 11 13 Photo 43475 1 Digital Radiocommunication Test Set CRTx Flexible test platform for general packet radio service GPRS General packet radio service GPRS is the new service of GSM standard Phase2 for packet oriented data transmission Compared with existing line oriented GSM data services such as high speed circuit switched data HSCSD 1 GPRS allows better adaptation to data networks like the Internet and more efficient use of available radio resources while offering the same data transfer rates Radiocom munication Test Set CRTx is ready to go for this new data service and with its flexible test facilities provides an excellent platform for GPRS test scenarios Th
51. lter r 0 115 ATSC YSB MEASURE SPECTRUM MPEG2 measurement t generators and decoders AWG 100 100 Let s go west ATSC ready for takeoff A special standard complying with national requirements is used in the US for terrestrial i ligi A y E E A G E C H T Dent integration dnte network or m te paiva ia ik DETECTOR pA MM i MPEG2 Realtime MIN MA co es oe ayo Monitor DVRM START FREG News 165 a 4 E 3 O M H H continuon mless STOP FREG ar 4 50 MHz ADD MOISE tim Pak Wee eo km REFERENCES OFF o Ean omani sed pam Balz Christoph Leutiger Mathias DVB T A Test Receiver EFA T The test reference now MPEG2 signal genera for terrestrial digital TV too News from tors and analyzers Rohde amp Schwarz 1999 No 164 pp News 164 2 CEHTER FREG ATTEH 30 dB 400 000 MHz 1 2 dBm PILOT CARRIER COHSTELL DIAGRAM PILOT ALUE DATA SIGHAL PILOT PILOT AMPLITUDE ERROR Condensed data of EFA ATSC Frequency range model 50 48 MHz to 862 MHz model 53 43 MHz to 1000 MHz model 53 with option EFA B3 5 MHz to 1000 MHz Input level range model 50 77 dBm to 10 dBm model 53 47 dBm to 14 dBm model 53 with option EFA B3 77 dBm to 14 dBm Bandwidths 6 8 2 MHz Modulation 8VSB Symbol rate 2 to 11 Msymbol s Equalizer auto freeze off BER analysis ahead of and after Reed Solomon decoder ahead of Viterbi decoder Measurement functions
52. m qualitative tests in an early development phase of the DUTs e analyze test results with powerful tools e make optimum use of expensive hardware Such requirements can only be met by high performance test systems that provide the measurement competence in optimum and transparent form and flexibly cover the range between one button testers and very versatile test systems lf there is a simpler way The Rohde amp Schwarz solution to these requirements takes the form of abstract complete test types matched to mobile radio needs The user can vary these test types in any way imaginable thanks to their transparent parameters One parameter set describes a test case that can be completely executed FIG 1 The following test types are currently available depending on the testsystem family transceiver transmitter receiver complex time and special DUT report ing measurements They are defined after abstraction of all test cases to be implemented possibly for all mobile radio standards with the aim of obtain ing an optimum between the total number of test types and the number of parameters to be configured and displayed Such a test type is character ized by e the mobile radio network to be configured eg characteristics of the useful channel e test conditions regarding DUT environment Test case 2 Transceiver Test case 12 Transceiver FIG 1 Parameter set describes complete executable test
53. mie z ITU conformant monitoring receiver Software for spectrum monitoring systems Recording processing and replaying MPEG2 transport streams 2000 Il 167 E I li it MI L al NUT ail MIL TTI M HTT Il m II Il I 1 i Radiomonitoring over wide frequency ranges at high scan rates The new Monitoring Receiver ESMB handles the frequency range from 9 kHz to 3 GHz and has excellent electrical characteristics and comprehensive functions all that com bined in an incredibly compact instrument page 4 Christian Gottlob Werner Rohde Alexander Worner Christoph Balz Mathias Leutiger Ernst Polz Patrick Kolligs Johannes Meidert J rg Pfitzner Heinz Peter Olbr ck J rg Zorenb hmer Robert Obertreis Number 167 2000 11 Volume 40 Photo 43565 ITU conformant Monitoring Receiver ESMB cccccceeeeccceeseeseneeeeeeeenans 4 Incredibly compact and high end into the bargain DTV Recorder Generator DVRG Recording processing and replaying MPEG2 transport streams 8 ATSC Test Receiver EFA All measurement functions for North American digital TV standard 11 Digital Radiocommunication Test Set CRTx Flexible test platform for general packet radio service GPRS 14 GH127 AllAudio Digital recording distribution and management of audio signals in radiomonitoring systems
54. mination of the signal type and its spectrum You can see immediately for example whether there is a marked frequency offset or if the pilot carrier level matches the specification FIG 4 An optional filter with 8 MHz channel bandwidth covers spectral components outside the 6 MHz user channel while effectively suppress ing more distant components Realtime signal analysis The powerful digital signal processing of EFA provides fast and in depth analy sis of 8VSB signals FIG 5 Analysis is simultaneous with and independent of demodulation and decoding so the MPEG transport stream is permanently available for vision and sound repro duction Thanks to this realtime analysis capability the large number of mea sured values necessary for the complex calculation and display processes are produced fast for subsequent mathe matical statistical processing Because of its rapid data acquisition the test receiver is an ideal choice not only in R amp D but also in production monitor ing where high measurement speed is called for EFA ATSC as monitoring receiver Monitoring receivers permanently moni tor the major parameters of broadcast signals directly at the transmitting sta tion FIG 6 EFA ATSC is tailor made for this application Six parameters with separately selectable alarm thresh olds can be configured for monitor ing Particularly worth emphasizing is BER monitoring ahead of and after the various error protect
55. mobile phone production Power versus PCL When measuring power versus PCL CMU 200 shows unbeatable perform ance ie time economies In no more than two or three seconds it deter mines the power of a mobile phone at all power control levels on three dif ferent GSM channels Using conven tional methods channel and power change followed by measurement of power versus time this would take more than 30 seconds Hopping in frequency CMU 200 changes power from the highest through to the lowest Pg t News from Rohde amp Schwarz Number 167 2000 Il 500 approx i inserted while mobile is waiting for execution of command PREETHI channels A B C L5 Combined with i hopping Idle multiframe is Configurable d 3iframes PCL 19 gt 15 steps of 13 frames approx 900 ms PCL FIG 4 and detects the power in realtime by the same method as in measurement of power versus slot The power measured on three differ ent channels is output in table form for each PCL FIG 5 In doing this the tester automatically takes into account the PCLs supported by the mobile CMU200 also incorporates sophis ticated selftest functions which are described on the next two pages Rudolf Schindlmeier LITERATUR Mittermaier Werner Schmitz Walter Universal Radio Communication Tester CMU 200 On the fast lane into the mobile radio future News from Rohd
56. on because they determine test times and thus throughput Universal Radio Communication Tester CMU 200 FIG 1 optimizes the two parameters for each application How this rapid tester helps you to cut down on measurement times is demonstrated here by the example of power measurements on GSM mobiles m L FIG 1 Universal Radio Communication Tester CMU200 optimally matches measurement requirements in GSM mobile phone produc tion Optimized in every case GSM specifications state how much power a mobile may emit as a function of power control level PCL together with the time characteristic a mobile must comply with FIG 2 The latter again depends on PCL CMU 200 per forms all the measurements required for this fast and extremely accurately Power versus frequency CMU200 allows GSM conformant measurement of the power character istic in all frequency bands GSM400 with option CMU K20 GSM900 with option CMU K2 1 GSM 1800 with option CMU K22 GSM1900 with option CMU K23 CMU 200 records several bursts 1 to 2000 of a mobile and from these finds the minimum maximum and average Photo 43 238 10 power characteristic In manual opera tion detailed analysis is simplified by a zoom function markers and auxiliary lines To allow immediate verification of compliance with GSM specifications the tester automatically positions the power versus time template over the measured burst and detects and marks violation
57. on from graphical presenta tions and through designations or part numbers FIG 2 Fulltext search is also possible FIG 3 News from Rohde amp Schwarz Number 167 2000 Il 21 Automatic contents generation Ordering and logistics information as well as graphics are for the most part automatically imported from existing Am ETA databases or CAD systems Operating X LEW a EJ S A 2 0 an amendments service will generally S SHED ETAT a require very little manual effort Integrated ordering system An ordering process is initiated for the particular spare parts or products through the ordering system Coupling to the manufacturer s goods manage ment system is possible via an Internet link Notepad and printer functions The producer and user can file a sepa rate note for each spare part via the notepad function So feedback can be obtained from the field on an online link Graphical views in CGM format can FIG2 User friendly combination of picture and be printed out by the integrated viewer text information Parts lists can be printed straight from the browser SPC ideal for experienced service providers i j The functions outlined here are just examples and can be expanded in a whole variety of ways The service center for technical documentation at the Rohde amp Schwarz Cologne Plant assists users in devising tailor made concepts for t
58. r considerable pressure especially when their customers expensive machinery or systems are shut down due to a defect A large number of different models versions and variants as well as a constantly changing product range aggravate this situation and often result in the wrong thing being ordered One solution to this problem is electronic spare parts catalogs SPCs with integrated search engines to speed up the tracing of the right spare part They reduce the effort involved in updating spare parts documentation simplify the ordering process and lots more ai View eee Pa py a an OL Her o a jet maisia ep ia dena are i a FECHIN rom Pe TE el M a LE redes NN uut E F God uL FIG 1 Hierarchical structure of complex units and systems helps to fid spare parts fast What is an SPC Based on techniques proven on the Internet the service center for technical documentation of the Rohde amp Schwarz Cologne Plant 1 develops electronic spare parts catalogs that make logistics a lot easier Searching through lists as well as order operations become much more convenient Thanks to the techniques used later integration into complex electronic documentation sys tems 2 is possible A free Internet browser available on practically every PC is used as display software In an SPC parts lists and graphics such as exploded view drawings are com bined electronically Parts l
59. r that processes the data is connected to detached direction finders via radio modems FIG 1 that can transmit remote control information plus IF spec tra or audio signals thanks to their high data rate Use of the radio modem in conjunc tion with broadband data transmis sion media such as satellites or DAB transmitters opens up completely new prospects DAB originally developed for digital radio is basically suitable for transmitting data of any kind FIG 2 Interactive multimedia applications using DAB have asymmetrical through put So a query for data on the Inter net can use the narrowband path whereas the usually vast amount of FIG 2 The Rohde amp Schwarz product range offers all com ponents for point to point communica tion from a single source various radio equipment families DAB and DVB transmitters and IT product PostMan 2 data is returned through the broad band medium This guarantees the extremely efficient utilization of the available resources Ulrich Otto Reader service card 167 14 Workshop on CD ROM Miniport Receiver EB 200 PERS f 8 B La N HM i o y Miniport Receiver EB 200 Obtainable free of charge from your Rohde amp Schwarz representative Ta rail SF ib il J a A new English German training CD ROM from Rohde amp Schwarz presents an extensive and versatile virtual workshop for familiarizing with operation and functionality of Miniport
60. rd service First Line Silver to above average service and support First Line Gold Appropriate upgrading will be undertaken to achieve the right performance category at the right place The support for large regions has been decentralized and assigned to an area support center Second Line Service which handles direct most of the service previously managed from Munich thus presenting greater on the spot presence The demands made on such an area support center are very high in both technical and logis tic terms The Rohde amp Schwarz Support Center Asia SCA sited in Singapore satisfied all the reguirements and was recently named the first official area sup port center photo Others are currently being set up in both Asia and Latin America Hans Joachim Mann The SCA team of the area support center for Southeast Asia E j Photo author A Spectrum Monitoring System ARGUS IT from Rohde amp Schwarz The ISCTI Istituto Superiore delle Communicazioni e delle Tecnol ogie dell Informazione which is part of the Italian telecom munications ministry awarded Rohde amp Schwarz an order to supply a GSM System Simu lator TS8916B with extensive accessories for a test center in Rome for the certification of GSM mobile telephones The TS8916B system is the state of the art in GSM conformance test ing and is used by virtually all producers and test houses world wide It comprises a total of nine wa
61. reduce the lifetime of transmitter output stages For this reason precisely specified limitation is chosen ie reduced crest factor FIG 5 illustrates the amplitude distribu tion of a DVB T transmitter showing the relative frequency of the amplitudes ina 1 dB amplitude window The rms value of the transmitted signal is used as the basis to which all other values are referred Noteworthy is the very high inherent crest factor of more than 15 dB of EFA T which offers a comfort able margin for this type of measure ment Since the theoretical amplitude distribu tion characteristic can be exactly cal culated with DVB T it is included in the diagram dotted lines above columns You can see at a glance if and how the signal is limited in amplitude Summary reference class EFA T offers further functions not described here such as spectrum analysis FFT and history So it is no wonder that the test receiver has rapidly become a reference in the class of realtime instruments All func tions and graphical displays are of course available also via the remote control interface Great ease of opera tion and extremely fast measurement cycles round off the comprehensive and innovative functionality of EFA T Christoph Balz REFERENCES 1 Balz Christoph Leutiger Mathias DVB T Test Receiver EFA T The test reference now for terrestrial digital TV too News from Rohde amp Schwarz 1999 No 164 pp 4 7 Digital s
62. revised interactive measurement mode IMM and the bearing measure ment mode BMM now ensure direct access to device settings This does away with bothersome setting through range configuration menus In addi tion to spectrum and signal analysis the interactive measurement mode now also offers antenna analysis for fast omnidirectional height and elevation measurements FIG 2 FIG 2 Antenna analysis in interactive measurement mode 2084 97 Q mm rLr5sEm Intermodulation analysis Intermodulation analysis is now inte grated into IMM The original frequen cies can be found much faster since the number of possible frequencies and the maximum order can be limited during calculation and the results displayed according to probability Editing the list of possible original frequencies was also extended and simplified Spectrum mode In the spectrum mode of IMM it is now possible to define alarm conditions If they are exceeded for example signal analysis of the particular frequency can be started Bearing measurement mode In the bearing measurement mode FIG 3 it is possible to calculate and store radiolocation results This requires the use of at least two direction finders Locations can also be performed by the automatic measurement mode or the interactive measurement mode and the results can be stored Automatic measurement mode In the automatic measurement mode FIG 4 scans of transmitter lists can be performe
63. rks of the second generation GSM Data trans mission is packetswitched not circuit switched like in HSCSD for example This enables better adaptation to exist ing data networks such as the Inter net and its associated services WWW e mail etc The short packets comprise a maximum of 1500 octets Through channel trunk ing multislot of up to eight timeslots a maximum data rate of 115 2 kbit s is achieved in full duplex mode same as with HSCSD Since some applications require a defined continuous data rate the user can select between different service classes QoS quality of service for which network operators guarantee the appropriate data throughput After registration a permanent virtual link exists round the clock which also allows faster access to the data network The major advantage from the point of view of network operators is the more efficient use of available radio resources With GPRS this is achieved chiefly by making use of radio resources only during data transmission Timeslots in uplink and downlink can also be split dynamically among several subscrib ers The chief advantage of GPRS where users are concerned is the low cost compared with former circuit switched transmission since only the actual data volume transmitted not the online time is charged Simultaneous data and voice communication is possible too GPRS based applications can be divided into two classes pointto point e
64. rns DVRG into a Windows NTTM workstation for which exten sive software packages are available for generating processing and ana lyzing transport streams in the unit FIG 3 The Stream Combiner soft ware 3 allows fast and simple modi fication and recombination of transport streams This software too comes with a large library of elementary streams into which elements of recorded seguences can also be integrated The coding of recorded transport streams can be analyzed and displayed in detail with the elementary stream analyzer of the Quality Analyzer software package 4 Applications here there and everywhere Video server Absolutely new in an MPEG2 genera tor is the optional ITU 601 interface This enables recording and replaying of uncompressed video signals turning DVRG into one of the most compact video servers on the market DVRG is thus an ideal signal source for testing encoders and decoders Development With its versatile capabilities DVRG is an ideal tool in the development of digital TV equipment of every kind for example encoders multiplexers modu lators receivers set top boxes In the simplest case one of the many prede fined test signals available in DVRG can be used If transport streams with specific contents are needed these can be obtained either by recording other sources or by freely configuring the recorded elementary streams of optional Stream Combiner software DVG B1 3
65. s An extra benefit for the user CMU 200 selftest functions offer the user a convenient way of checking basic instrument functions and thus reliably excluding faults This is impor tant for example in the production of mobiles where the user needs to be sure that his measuring equipment is operating properly At Rohde amp Schwarz service centers the selftest functions are used in incom ing inspection of instruments returned The tests supply detailed information about faulty modules which enables fast repair ie replacement Customers benefit from short repair times because their instruments are soon available for use again Menu guided test runs The selftest menu is called with the MENU SELECT key on the CMU 200 front panel examples are shown in FIGs 1 to 3 Then you select the BASE Maintenance function group with the spinwheel and confirm with ENTER The selftest menu Maintenance Dyn Test opens and you can choose the particular test with the spinwheel after pressing the SELECT softkey Detailed report The selected selftest is started by press ing TEST and confirming with ON You can cancel a selftest at any time by FIG 1 Example selection of selftest function aud RE H d s 00 X pressing OFF At the end of the selftest a report is displayed in which you can scroll up and down with the spinwheel after pressing the REPORT softkey Any fault that may have occurred is thus easily located
66. s March issue with the Bluetooth image motif from Rohde amp Schwarz Inside the magazine reported on the new Bluetooth test system V m m i m mo gl le EI BA ih 15 s AN JR Tiie SLE ZEE i a Loree rie ree i Markertphaere Top the star the new ATSC Test Receiver EFA left Michael Vondermassen Head of the Broadcasting Division receiv ing the Star Award In TS 8960 Rohde amp Schwarz is launching the world s first test system for Bluetooth equip ment and components This system right in tune with the current Bluetooth core specifi cations 1 0 and RF test specifications 0 7 can be used for both conformity tests and measurements in the development phase or in quality assurance All necessary Bluetooth test cases are ready set but their parameters can be modified and adapted as wished 1S 8960 is available straight away making it the first and only Bluetooth test system obtainable on the world market Instrumentation for digital TV The front spread of the April edition of the European broadcasting magazine IBE was taken up by measurement solutions for DTV from Rohde amp Schwarz An article inside the journal described the use of this instrumenta tion in terrestrial digital TV networks Star Award for ATSC Test Receiver EFA TV Technology the world s major and most read magazine focusing on the broadcast industry presented its Star Award in the cat egory for me
67. s in ArgusEval e The newly developed data naviga tor in ArgusMon and ArgusEval allows extremely fast access to def inition files and measured results e The time stamp in the measured results now also indicates milli seconds to accommodate modern receivers e The speed of graphics presenta tion is as much as ten times faster e ArgusEval contains new statistics for frequency band occupancy according to a planned ITU recom mendation FIG 6 All statistics can be generated faster because the measured results can be used direct Generating the channels is no longer necessary Many improvements and additions in the new version make the software packages even easier to operate for faster turnaround The self explanatory user interface increases productivity decisively and takes stress off the opera tor in performing the various and com plex measurements J rg Pfitzner Reader service card 167 06 REFERENCES 1 Seidl Wolf Spectrum monitoring the ITU way News from Rohde amp Schwarz 1997 No 153 pp 26 27 2 Pfitzner J rg Radiomonitoring System TS9965 Complete coverage up to 18 GHz News from Rohde amp Schwarz 1994 No 146 pp 22 25 3 Fokken Theodor Mini receivers Remote control lends weight to network role News from Rohde amp Schwarz 1999 No 165 pp 6 17 Electronic spare parts catalog Short clicking is better than long leafing People in spare parts logistics and field service are often unde
68. s of limits and specifications FIG 2 The template is automatically adapted to the particular power control level The user can define template FIG 2 CMU 200 auto matically positions Mm power versus time C template over mea sured power charac rs f teristic and checks La compliance with specified values Tolerance violations iu WE indicators and measured values highlighted in red km m QUE Hi eben and tolerance limits to match mobile specific requirements In short with CMU 200 you can check at a glance whether the power characteristic of a mobile is go or nogo The pass fail indicators are available also in remote control So on the remote control computer you can deter mine immediately without elaborate analysis whether or not a mobile con forms to GSM specifications Plus you s Tuai dq ig a ig perie umm APS oo en Se oe ee Se a are marked by fail i 24 News from Rohde amp Schwarz Number 167 2000 1 URE Eeg can read out the complete power char acteristic minimum maximum and average or selected parts of it In the latter case CMU 200 also detects the minimum maximum and average power values of the selected part This special feature allows time optimized recording of especially critical parts of the power characteristic and makes it very easy to trace power ripple of the use
69. s recently commissioned in Bhutan a country in the eastern Himalayas It was contracted by the Ministry of Communi cation and consists of a sta tion in the capital Thimphu plus an all terrain test vehicle physical RF channels and extra RF instrumentation for measuring fading effects or wideband inter ference Many years of experience in all sectors of mobile radio and especially in certification testing have made Rohde amp Schwarz the world s market leader The ISCTI which is responsible for certificating digital communica tions eguipment in Italy intends to set up a GSM test center by mid 2000 that covers the broad spectrum from protocol and RF tests through to acoustic and EMC tests plus environmental simulation photo In Bhutan the focus is on coordinating the many medium wave transmitters in the coun try itself and in the neighbour ing countries China and India to prevent mutual interference At the official handover Bhutan s In the new version of the BSI tool Secure UNIX Administra tion Rohde amp Schwarz is offer ing software with which UNIX systems can be tested for gaps in their security The software performs security checks auto matically or manually produces suggestions for correcting weak nesses in security and even supports the system adminis trator in eliminating detected sources of danger In the cata log of measures of the Safe Internet task force recently publis
70. ser interface for operat ing DVRG as work station dard 19 inch enclosure and Ethernet interface 100BaseT simplify integra tion of DVRG into test systems IF an EUT outputs MPEG2 transport streams or SDI video streams these can be recorded by DVRG for test or quality assurance purposes and Condensed data of DVRG Signal inputs and outputs Transport stream Packet lengths Sequence length Signal set Data memory Operating system Remote control interfaces Reader service card 167 02 10 News from Rohde amp Schwarz Number 167 2000 11 subsequently analyzed offline with other tools such as MPEG2 Measure ment Decoder DVMD or Digital Video Quality Analyzer DVQ 4 Monitoring DVRG is suitable also in monitoring applications Triggered recording allows in depth analysis of error states that occur only rarely The trigger signal is supplied by MPEC2 Realtime Moni tor DVRM 5 or by DVQ for exam ple FIG 2 DVRG can be set to start recording some time before the trigger event so that the cause of an error state can easily be traced In a workstation configuration the Stream Explorer and Quality Explorer software options can be installed on these units to produce a complete compact test station Compact powerful and extremely flex ible these properties make DVRG a highly versatile MPEG2 test device Werner Rohde Alexander Worner DVB TS ASI active loop through input DVB TS SPI LVDS ISDI
71. tional requirements Fading is a general problem in mobile radio It can be time and frequency selective multipath fading in particular causes problems when transmitting data via mobile radio links The new data modem offers significant advantages by using OFDM orthogonal frequency diversity modulation Here the data stream is split into parallel bit streams and spread over several carriers in the baseband In addition to the modulated car riers pilot tones sinusoidal are integrated in the spectrum for channel estimation and synchronization To enable the baseband signal with up to 24 kHz bandwidth to be transmitted in stan dardized frequency grids eg 25 kHz linear conversion to the channel frequency is per formed by modulation similar to SSB Since the data rate is split up among a large 34 News from Rohde amp Schwarz Number 167 2000 1 number of carriers symbol duration can be selected large enough to minimize fading effects and intersymbol interference To make communication resistant to inter ference the various QAM quadrature amplitude modulation g lt 64 signal states are trelliscoded Trelliscoded modula tion TCM is a combination of encoding and modulation technigue that yields an improvement coding gain and shaping gain of almost 6 dB compared to eguiva lent QAM without trellis coding Radio DF networks are a good exam ple of remote controlled applications A central communication serve
72. ults of analy ses can be assigned correctly e recording of each channel can be controlled by software and infor mation like time file name etc is exported to a controlling applica tion for management in a common database Easy to get into The simple and self explanatory user interface Windows NT configur able user groups with different rights and automatic control of input level are features that make a change from con ventional analog technology or oper ation for inexperienced users a lot easier And integrated data adminis tration allows experienced users to manage their recordings much better than before GH 127 AllAudio can be supplied in different configurations eg as software with sound cards for use on PCs or as a completely remote controllable digital recorder Johannes Meidert Reader service card 167 05 17 Photo 43336 Spectrum Monitoring Software ARGUS 4 0 New software generation for spectrum monitoring systems Spectrum Monitoring System ARGUS IT formerly SMSI plus TS9965 1 2 is equipped with different software packages for complex radiomonitoring tasks ArgusMon and ArgusEval now available in upgraded versions form the core of the software Measurement Software ArgusMon pro vides very different means of measur ing electromagnetic emission in various modes according to ITU recommenda tions It can be scaled by using modu lar components controlling a single de
73. ured hardware inputs Outputs or playback windows are generated and switched when user selects a live chan nel or recording a center frequency of 12 5 kHz like VLF HF Receiver EK896 or digital audio signals eg from Digital Monitor ing Direction Finder DDFOxM from Rohde amp Schwarz GH127 AllAudio is ideal for all sys tems in which automatic audio signal recording and distribution as well as communication via intercom are to be integrated Radiomonitoring and spec trum management are typical fields of application GH 127 AllAudio in detail Flexible signal distribution Audio signals are distributed by switch over or mixing the input channels by 16 News from Rohde amp Schwarz Number 167 2000 11 GH 127 AllAudio at a glance e Flexible local audio signal distribution by software configu ration of up to 16 channels LAN distribution to any number of workstations by multicast tech nology Speech transmission in WAN by compression from data rates of 9600 baud per channel Local recording of all channels for optimum use of resources central archiving possible Integrated database report function and data backup for management of recordings Optional intercom with auto matic muting of audio sources group call etc software FIGs 1 and 2 A data buffer with 60 s capacity is available for each channel The user can play passages again by positioning the mouse appro priately Output is on headphones or
74. vice see 3 and page 5 Monitoring Receiver ESMB is as easy as operating several unattended stations Evaluation Software ArgusEval allows comprehensive statistical analysis of measurement results according to ITU recommendations In addition mea sured results the associated definitions and statistical evaluations can all be documented Both software packages are now avail able in version 4 0 They come with improved user friendliness even better oriented on the tasks of radiomonitor ing Plus the latest ITU recommenda tions are also considered The most important modifications compared to version 3 6 are described in what fol lows FIG 1 monitoring stations EDT ere 18 News from Rohde amp Schwarz Number 167 2000 11 Ri Ci ves System visualizer in ArgusMon produces schematic of complete radio j f E 5 1 wil ell ims S The most important modifications System visualizer The new system visualizer in ArgusMon produces the schematic of a selected radiomonitoring station antennas receivers analyzers decoders and recording equipment with all their con nections are shown in graphical rep resentation FIG 1 The required con nections between antennas and receiv ers can be selected and switched by mouse click A second mouse click on a device icon opens the interface from which the user can control the device and measure with it Interactive measurement mode The
75. ystems for television sound and data services Framing structure channel coding and modulation for digital terrestrial television ETS300744 European Telecom munications Standards Institute ETSI 2 kl Reader service card 167 13 u T E m i ia r mi 8 j Ca i L a E A Rt SR o T d E E non 1 a DYB T HEASURE FREQUENCY DOMAIN AMPL PHASE AMPL G POLAR PLOT START CARR EE STOP CARR 1704 ADD NOISE OFF DYB T MEASURE FREOUENCY DOMAIN 44 SYMBOLS PROCESSED MER de IHTERFEREHCE MER AMPL PHASE AMPL GO POLAR PLOT START CARR 5 STOP CARR 1704 ADD NOISE OFF DYB T HMEASURE TIME DOMAIN EI AMPLITLUDE DISTRIBUTION IMPULSE RESF MS KM MILES ADD HOISE OFF 20 100 4150 200 E PH ATAT 2 PERI DMA TH N ADD HOUSE JE OFF ACO 10 24E E News from Rohde amp Schwarz Number 167 2000 II 33 64 kbit modem for multifunctional mobile radios Software enhancement of functions for future requirements The newly developed radio equipment families from Rohde amp Schwarz eg Series 4400 1 are set up with hardware and software modules on a uniform platform This principle ensures across the board use and radio system standardization with all the accompanying potential for low cost of ownership The universal platform can be adapted to future requirements by software and hardware extensions to the bas

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