FM Stereo Tuner Measurement
Contents
1. Enter the key code in the registration form and click Start The main window for FUTunerMeas_demo appears Once the program has been registered the registration form will not appear the next time you run FWTunerMeas_demo NOTE If FW TunerMeas_demo has not been registered you can still start the program by clicking the Start button 6 Rohde amp Schwarz FM Stereo Tuner Measurements 6 Operating FMTunerMeas demo Software Getting started 1 Start FMTunerMeas_demo EXE Ea FM tuner program using SML UPLAUPY audio Frequency Response THD Noise vs Mod Frequency Crosstalk vs Deviation Crosstalk 1kHz vs RF lewel Modulated S N Ratio vs RF level npULOutpul Ratio ws RF lel 2 Connection and instrument control setup Before you can use this software for connecting the instrument you must configure the program to match your setup e g GPIB connection and then click the Test Setup button for your test configuration as follows Setup ay Ter aa LE li ET aA pei gt rh F i a Ji mee gt i Piya ar p pms Tii i af Fi Pas a e Pn r k hw TE EN s z ra nl fico i RAC 0502 0012 version1 1 7 Rohde amp Schwarz RAC 0502 0012 version1 1 FM Stereo Tuner Measurements 3 Run the test Before you run the test program you should select the test procedures you want or click the Selected All Items button to select all the test pr2. CEAD O O EEB 00939 00 R L Remote PE Sohware FMTunerhieas 5 Rohde amp Schwarz FM Stereo Tuner Measurements 5 Installing the Software RAC 0502 0012 version1 1 3 4 5 Extract the ZIP file FMTunerMeas_demo zip available for free download from the R amp S website Start SETUP EXE to install the program Program files are copied to a directory of your choice during installation Complete the registration form to receive a registration key Welcome to FMTUNERMEAS_DEMO v1 00 You are using an unregsiered version of FMITUNERMESS DEMO This version has ful tunctionality and mo expiration date As we are continuously mproving the program we depend on your comments and experience with FMTUNERMEAS DEMO Therefore we kindh ask you to register FRTUNERMEAS DEMO Registration is tree of charge and doesn obligate you or your company Z Cick Copy Registration Form to Clipboard fagliieaion donn io RAC aniindhiie actwears coe You will receive an email from Rohde amp Schwarz wath your regesination key t The registration key is derived from your name Al other akis may be filed cut cptionedy a eee Company bo oo mi TT lt a Copy Registration Form to Clipboard 1 Enter your User Name and Regatration Key 2 Click Continus FMTUNERMEAS DEMO will start inumeckatety This registration form wil no longer appear at program start ser Hamel rite cheond
3. requirements Microsoft 32 bit operating system Windows 2000 XP GPIB driver installed CVI runtime engine VISA runtime version 2 5 or later For a document report Microsoft Word 2000 or later must be installed 4 Connecting the Computer and the Instrument RAC 0502 0012 version1 1 The instrument connection is set up via an IEC IEEE bus primary address Make sure that each instrument has a unique GPIB address Connect the RF output of the R amp S SML to the unbalanced antenna input of the tuner Since the R amp S SML has an output impedance of 50 ohm the generator has to be matched to the tuner Usually the coaxial 75 ohm antenna input is used We recommend using the Matching Pad R amp S RAM which can be ordered under 358 5414 02 If the receiver to be measured is only equipped with a balanced input an adequate balun with an impedance of 240 ohm or 300 ohm must be connected in between the R amp S SML s 50 ohm output the receiver balance input Make sure that measurements are performed with adequate grounding e g to eliminate hum pick up Since tuners are normally not grounded and their outputs are floating the inputs of the R amp S UPV R amp S UPL should be grounded provided a ground connection is not established via the antenna connected to the R amp S SML RF modulated test signal including ARI and RBS SML or SMV with B5 1 a r F EJ e eiL Ee 2 1 E Urm 4
4. 1 9 Rohde amp Schwarz
5. e ne a cee eee eee 9 8 Additional Information ccc cece sec eeceeeeeceeneeeeeeceeeeeeueseeeeeueeseesseeeneeees 9 9 Ordering Information c cece eeccc eee ceeeeeeeceeeceeeceeceeeeseueceeeteueeeeseeeeaeetes 9 More and more modern mobile phones and PDAs come integrated with FM chipsets To analyze the quality of RF FM tuners a large number of measurements have to be performed This Application Note presents a program FMTunerMeas which combines automatic FM tuner measurement sequences in line with DIN EN60315 4 It is an extension of Application Note 1GA43 and can be used with the Audio Analyzer R amp S UPV The program FMTunerMeas is included Run FMTunerMeas to perform measurements via GPIB remote control or to simulate the test sequences without any hardware connected The report with measurement graphics and the test results are generated automatically in the appropriate folders in the user s computer 2 Stereo Frequency Modulation Theory In FM the amplitude of the information signal is used to vary the carrier frequency while the frequency of the information signal determines the rate at which the carrier frequency changes For a transmitter with linear modulation characteristics the frequency deviation of the carrier is directly proportional to the amplitude of the applied modulating signal The frequency deviation is defined as follows O k Ey where k f frequency deviation V is the frequency sensitiv
6. hasis Filter l EH 10 kHz L00 kHz 0 dk 3 dB at 2120 Hz De cmphasis Filter sol 7 dB at 15 kHz i i m l kHz 1 kHz 100 kHz FM Stereo FM Stereo Transmitter block diagram The left and right sources of information are first pre emphasized and then fed to adder circuits The output of one adder is the sum of the two signals L R and the output of the other adder is the difference of the two signals L R The L R signal is applied to a balanced modulator driven with a 38 kHz signal The output of the balanced modulator is a DSBSC AM signal centered at 38 kHz 3 Rohde amp Schwarz FM Stereo Tuner Measurements Quartz ascill 19 kHz R MPA Signal channel 59 pS L Rif2 y ac Balance Output FM L Ry2 peter unit Transmitter L Left Preemph channel 50 ps Level Deviation Spectrum of the Stereo MPX Signal RDS Spectrum o 10 20 30 40 50 60 FI kHz 19 8 7 Pilot Stereo Subcarrier RDS Subcarrier suppressed suppressed FM Stereo Receiver block diagram Left channel FM a To the AF Receiver modulator Amplifiers R Right Output of De channel the Lowpass emphasis demodulator filter RAC 0502 0012 version1 1 4 Rohde amp Schwarz FM Stereo Tuner Measurements 3 Hardware and Software Requirements PC hardware requirements CPU Pentium III 800 MHz or better RAM 128 MB or more Monitor VGA color monitor IEC IEEE bus Nl compatible IEC IEEE bus interface PC software
7. ity of the FM modulator and is the peak frequency deviation Mathematical analysis of FM E nt E sn 2af t m sin27f t The R amp S logo Rohde amp Schwarz and R amp S are registered trademarks of Rohde amp Schwarz GmbH amp Co KG and its subsidiaries RAC 0502 0012 version1 1 2 Rohde amp Schwarz RAC 0502 0012 version1 1 FM Stereo Tuner Measurements where E is the peak amplitude of the carrier frequency f and fm represent the carrier and modulating frequencies and m is the index of modulation m _ where fy is the rated maximum system deviation M Pre emphasis and de emphasis In normal speech and music the spectral amplitude of the signal drops at higher frequencies This behavior can be used to improve the signal to noise ratio of the FM transmission In the transmitter the higher signal frequency amplitudes are amplified Due to the typically lower amplitudes at higher frequencies this can be done without violating the rated maximum system deviation RMSD On the receiver side this frequency dependent amplification is compensated by a lowpass with exactly the same time constant used in the transmitter This lowpass reduces the noise in the receiver but produces an overall flat frequency response for the desired signal due to the pre emphasis in the transmitter ik 20 dB 7 tae TE 1h Amplifier 20 di 17 dB at 15 kHz f a ap FF YL Lem r a p i 41 i Pa A dB Ds 2120 He Presemip
8. nal Generator R amp S SML with option B5 1GA24_ 1E Klaus Schiffner Marco Brusati Measurements on Tuners using the Audio Analyzer R amp S UPL or UPD and Signal Generator R amp S SMT 1EC 60315 4 1997 Methods of measurement on radio receivers for various classes of emission part 4 Receivers for frequency modulated sound broadcasting emissions NI VISA User Manual National Instruments available for free download http www ni com visa Additional Information For additional information or further suggestions please contact your nearest Rohde amp Schwarz office or rac ap rohde schwarz com 9 Ordering Information Audio Analyzer R amp S UPL 1078 2008 06 R amp S UPV 1146 2003 02 Signal Generator R amp S SMLO1 9 kHz to 1 1 GHz 1090 3000 11 R amp S SMLO2 9 kHz to 2 2 GHz 1090 3000 12 R amp S SMLO3 9 kHz to 3 3 GHz 1090 3000 13 R amp S SMV03 9 kHz to 3 3 GHz 1147 7509 13 R amp S SML B5 Stereo RDS Coder option 1147 8805 02 Accessory R amp S RAM Matching Pad 50 75 Ohm 0358 5414 02 amp ROHDE amp SCHWARZ ROHDE amp SCHWARZ System amp Communication Asia Pte Ltd Regional Application Center 1 Kaki Bukit View 04 12 TECHVIEW Singapore 415941 Telephone 65 6513 0475 Fax 65 6846 1090 Internet htto www rohde schwarz com This Application Note and the supplied programs may only be used subject to the conditions of use set forth in the download area of the Rohde amp Schwarz website RAC 0502 0012 version1
9. ocedures FM tuner program using SML UPL UPY Audio Frequency Response _ THD Noise vs Mod Frequency v THD Nose vs Deviation w Crosstalk vs Frequency Crosstalk vs Dewation Crosstalk 1kHz vs AF level Modulated S N Ratio vs RF level Input Output Ratio ve AF level d Report You also can click the Report button to include the information that you want to add to your report files Report Setup The following tithe will be included after you click Fi DUT Modet jaz Peer FF Operator Name Mike Cheong F Comment five F Date t Time ok Cancel 4 Run the simulation test You can execute this software without connecting any instruments In order to do that you have to enable the Simulation check box Simulation Note In order to run this software properly please close the Tuner BAS or any other BASIC program running in the R amp S UPL If MS Word is not installed in the controller PC you can enable Txt Format and disable Word format Diagram If you want a Word printout format with picture results MS Word 2000 or a later version needs to be installed in the controller PC 8 Rohde amp Schwarz FM Stereo Tuner Measurements 7 Literature Audio Analyzer R amp S UPL Operating Manual Audio Analyzer R amp S UPV Operating Manual Signal Generator R amp S SML Operating Manual 1GA43_0E Tilman Betz Measurements on RF radio tuners with Audio Analyzer R amp S UPL and Sig
10. wi THD Noise vs Mod Frequency THO Noise ve Deviation Cinastalk va Frequency Crosstalk vs Deviation Crosstalk 1kHz ve AF level Modulated S N Ratio vs RF level v iinpuyOulputRatovs AF level Suppression of Pilot Tone amp Subcamer_ Products R amp S UPL R amp S UPV R amp S SML FM Stereo Tuner Measurements with Audio Analyzers R amp S UPV or R amp S UPL and Signal Generator R amp S SML with R amp S SML B5 option Application Note RAC 0502 0012 This Application Note presents a program called FMTunerMeas which combines FM tuner measurements to form automatically running sequences in line with DIN EN60315 4 It is an extension of Application Note 1GA43 and can be used with the Audio Analyzer R amp S UPV amp ROHDE amp SCHWARZ Subject to change Mike Cheong Tilman Betz 03 2006 RAC 0502 0012 version 1 1 Contents 1 Overview FM Stereo Tuner Measurements We CTV 16 Wy EAE E AE A E AAE EE 2 2 Stereo Frequency Modulation TNEOSy ccccecccececseeceeeeeeeeeeeseeeeaeeees 2 3 Hardware and Software Requirements ccccccecseeeeeeeeeeeeeeeeeseeeeeees 5 4 Connecting the Computer and the InstruMent cccceeceeeeeeeeeeeeeee 5 5 Installing the Software ccccccsssccceeeceseeseeeccesceceeecsueesueeeesueecueessaeesaees 6 6 Operating FMTunerMeas demo Software ccccceecceceeseeeeeeseeeeaeeees 7 fame lt 21 0 eee eee ee eee o
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