MR25 Service Manual
Contents
1. H N o lt H ES a M3 200 210 _ n U PANEL TT none B cores SCREW l y k 188 135 205 5 MR25 400MHz Racom s r o MR25 Service Manual 132. 000 24 AKU 24V F6 3A PKC106 yellow 3 C red faston PKC106 yellow ous blue faston PKCO506 2x lock the polarity is not distinguished thermistor Racom s r o MR25 Service Manual 3 RADIO MODEM MR25 VERSIONS 3 Radio modem MR25 versions The following chart shows the port asignement to individual versions of the MR25 RS232 simple RS232 V 24 RJ45 Ethernet MR25 type TxD RxD RTS TxD RxD RTS TxD RxD RTS CTS DSR CTS DSR CD Gis DSR ED TxC RxC MR25X ver lt 11 rzn subverze MR25X ver 12 MR25ET MCM302ET MR25X hw version 11 and older was produced in more subversions labeled o XS with synchronous port V 24 o X4 ports configurable to RS485 RS422 o XE economy with limited volume bytes min o X asynchronous port RS232 or RS232 simple which covers the majority of cases MR25X hw version 12 produced since 8 2001 has the RS232 port only MR25ET is equipped by synchronous port V 24 in context with faster medium Ethernet RS485 or RS422 signals can be connected by optocouplers OPI485 or OPI422 The DSR signal is connected via resistence to 12V Racom s r o MR25 Service Manual 4 LED NUMERALS IN THE MR25 4 LED Numerals in the MR25 4 1 Seven segmented display in the MR25 modem part Located on upper part of MR25 near of the RACOM logo DQ 20 31 DQ Data Quality DQ The receive
3. MINI UHF type connector The fitting for the connector corresponds to the type and impedance For antenna leads we recommend cable RG58 for lengths up to 10 m and RG213 for longer lengths 2 2 MR25 Data Connectors DSUB37F All inputs outputs three serial ports and some parameters for service functions run through this connector Signals shown in the table are functions depending on the version of the MR25 more in the chapter 3 The old designation COM 1 2 3 is replaced by SCC O 1 2 now Port SCCO Port SCC1 pin in out pin in out pin in out pin in out 2 RxD 3 TxD 27 RxD 28 TxD 21 RTS 22 CTS 9 RTS 10 CTS 4 DTR 20 DSR 29 DTR 8 DSR 1 CD 23 GND 26 CD 11 GND Port SCC2 pin in out pin in out 32 RxD 33 TxD 14 RTS 15 CTS 13 CD 34 GND 2 2 1 Other pins pin no 17 Ext PTT input output for station service transmission pin no 36 Ext AF audio frequency output for demodulator pin no 37 GND ground pinno 7 10V auxiliary signal for SCCO pin no 31 10V auxiliary signal for SCC1 pin no 19 12V this input is not for direct supplying of external devices The using consult with producer 6 Racom s r 0 MR25 Service Manual 2 MORSE CONNECTORS 2 3 Wiring for RS232 V 24 2 3 Standard Connector Wiring for Interfaces RS232 V 24 DCE equipment 2 3 1 RS232 interface Canno
4. MR25 Service Manual Radio modem designed to transmit data RACOM s r 0 Nov M sto na Morav Czech Republic May 23 2005 Contents Contents Contents 1 Radio modem MR25 4 1 1 Description of functions s e s se sas auces np ee e e ee 5 114 MR25 Radio Partes ba a la id a 5 11 2 MR25 Modemi Part 3 2a 2 ioe A eH R00 AE AAA HE A de 5 2 MORSE connectors 6 2 1 Antenna Connector 6 2 2 MR25 Data Connectors DSUB37F 6 BZ Other pihs a RE ATA NA 6 2 3 Wiring for RS232 WA 0 0 ae Bi ee a de gb gr p an sa 7 2 3 RS232 interface ss 2 LL shaded hs de a tig 8 Hw 2 ele a Pme O amp ges T A E GS iaar ie et AA 7 2 4 Service Connector Wiring 7 2 3 MR25 Power Connector ars a Bars su Denis 3 n Ri E RAB A eS 7 2 6 Power connector types s e c e ss kon v Vol a aug te pete 8 3 Radio modem MR25 versions 9 4 LED Numerals in the MR25 10 4 1 Seven segmented display in the MR25 modem part 10 4 1 1 Condition while active connected terminal 10 4 1 2 Condition without attached to service terminal 10 4 1 3 Writing into flash memory 11 4 2 Seven segmented display in the radio part MR25 11 5 MR25 Technical Specifications 12 6 MR25 Mechanical Specifications 13 Addresa RACOM s r o M rov 1283 592 31
5. Nov M sto na Morav esk Republika Telefon 420 566 618 578 GSM 420 602 511 061 GSM 420 603 149 439 GSM 420 724 080 224 GSM 420 777 828 240 Fax 420 566 618 035 email mail racom cz WWW www racom cz Racom s r o MR25 Service Manual 3 1 RADIO MODEM MR25 1 Radio modem MR25 The MR25 is a radio modem designed to transmit data in the VHF and UHF bands with 25 kHz 12 5 kHz channel spacing The radio modem uses 4 level GMSK modulation which makes possible a maximum communication speed of 21 68 kbps 25kHz channel spacing From the point of view of the data network s architecture it is possible to consider the radio modem as an autonomous system the operator has at his disposal three standard ports RS232 it can by converted to RS422 485 by RACOM optocouplers OPD Identification of modems by frequency band e 146 162 2 MHz RACOM160S21L e 162 2 180 MHz RACOM160S21H e 300 360 MHz RACOM300S21 e 400 444 MHz RACOM400S21L e 444 493 MHz RACOM400521H By means of the modem module it is possible for the radio data transceiver to configure an arbitrary transmission and receiving frequency in the divided frequency span 3 2 MHz in the 25 kHz or 12 5 kHz channel grid Input and output work frequencies are independent of each other and are derived from the frequency by the 4 phase lock loop system programmed in the transceiver microcontroller The channel setting is stored in EEPROM memory in the transc
6. d packet is for this modem 12 19 for any adress of the modem i AN DQ Flashing 6 11 Sync i reguest state read the error logs Continuos light V O service state n Da 1 5 TX on Sync synchronization of modem circuits TX on illuminates when giving a command for transmission 4 1 1 Condition while active connected terminal Condition while switching on the modem a connector from an active connected terminal is inserted in the service connector i b indicated the base loader module is launched if Enter is pressed within the next 3 LI seconds the modem stays in this module after guick changing a pair of characters the display remains dark for next 6 seconds the JN main module is launched If any ordered command is send from Setr on this time then the whole menu goes to the default values in memory If it doesn t happen the program starts with the values set in flash memory after finishing the start process a group of number leaded by letter r or c starts circulate This mi number indicates the version of software Modem is set in MORSE mode mi e Modem is set in C92 mode 4 1 2 Condition without attached to service terminal Condition while turning on the modem the service connector is not attached to any active connected terminal 1 0 Racom s r o MR25 Service Manual 4 LED NUMERALS IN THE MR25 4 2 Seven segmented display in th
7. e radio part MR25 e after quick changing a pair of characters the display remains dark for next 6 seconds the main module is launched e after finishing the start process a group of number indicating the version of software starts circulate From the previous information it can be gathered that the ideal conditions high DQ packet received for this modem modem circuits synchronized etc are indicated by a 0 zero when receiving Error states e Center segment flashing check and analyze the error logs e Zerois not indicated relatively low DQ the modem did not synchronize or the packet is not destined for this modem e Sync is not indicated the modem is not able to synchronize with any packets on the RF channel Sync should be indicated for the duration of receiving e Nothing is indicated some unknown operation for the modem is on the RF channel eg packets are transmitted with another polarity menu FMe there is interference on the RF channel 4 1 3 Writing into flash memory When writing into flash memory by the service terminal SETR commands w write and 1 Init the display signalize shortly C I 4 2 Seven segmented display in the radio part MR25 Located near of the antena connector 70 to 80 dBm E ES S 80 to 90 60 to 70 dBm dBm S 90 to 100 dBm gt 60 dBm Y AT 100 to 110 dBm TX on illuminates during transmis
8. econd filter has suppression characteristics needed for channel selection in the 25kHz user s channel space 1 1 2 MR25 Modem Part The modem part is composed of three basic blocks 1 the microcomputer controller 2 the convertor circuits for standards RS232 3 the modem data circuits The microcomputer has 512 kB of flash memory and 64 kB RAM memory available Included among the circuits are a backup battery for power in real time a detector for monitoring lost power and a circuit watchdog During a power failure a charge preserved in the electrolytic capacitor enables the exact time of the occurance to be recorded into flash memory So the operator has the relevant information on hand to determine the length extent and manner of the blackout The microprocessor activity is protected by a circuit watchdog Protection is implemented by the processor chip and if needed it carries out a 16 second reset Convertors RS232 can work with speed limitation 120 kbps The convertors are protected against prestress by TRANSIL components Data conversion on the 4 level FSK modulation signal and back is made possible by a specially pro grammed circuit made by CML The transmission speed of 21680 bps is derived from the crystal oscillator on the board of the radio part Racom s r o MR25 Service Manual 5 2 MORSE CONNECTORS 2 MORSE connectors 2 1 Antenna Connector The cable for connecting the antenna is equipped with a
9. eiver and in FLASH memory in the modem module whose communication processor controls the performance of the transceiver microcontroller The output power of the high frequency signal from the radio modem transmitter is digitally adjusted in 16 steps A description of the MR25 software controls and configuration is available in the publication Morse Firmware Documentation in the chapter Morse main menu 4 Racom s r 0 MR25 Service Manual 1 RADIO MODEM MR25 1 1 Description of functions 1 1 Description of functions 1 1 1 MR25 Radio Part The architecture of the MR25 radio modem provides for a comfortable and reliable working station Fre quency synthesis makes possible multi channel operation with the synthesizer s dividing conditions being stored in EEPROM memory The performance of the radio data transceiver module is controlled and diag nosed with the microcontroller The logic circuits the switching stations between the receiving and transmitting modes have high signal noise immunity and activate the relevant blocks gradually This minimizes most of the transient parasitical conditions and optimizes the bandwidth when switching over The receiver part of the modem works with two mixes Centralized selectivity is divided between both interfrequency degrees The first filter maintains the basic channel preselection until suppressed ensuring linear functioning for the second mixer and the interfrequency amplifier The s
10. n DSUBOF connector pin signif pin signif pin signif 1 CD 4 DTR 7 RTS 2 RxD 5 GND 8 CTS 3 TxD 6 DSR 9 2 3 2 V 24 interface Cannon DSUB25F connector pin signif pin signif pin signif pin signif pin signif 1 6 DSR 11 16 21 RDL 2 TxD 7 GND 12 17 RxC 22 3 RxD 8 CD 13 18 LAL 23 4 RTS 9 14 19 24 5 CTS 10 15 TxC 20 DTR 25 TI 2 4 Service Connector Wiring Designated Service Cable DKR12 The wiring of DSUB9 connector corresponds to DTE devices ar lee j ee l RX data gt pin 2 TX data pin 3 2 5 MR25 Power Connector of Jo O AA Figure 2 1 The wiring of power supply plug in MR25 Racom s r o MR25 Service Manual 7 2 6 Power connector types 2 MORSE CONNECTORS 2 6 Power connector types The type of power cord used is NKRx NKR MS220 MR25 nn po z 3 nn r ved ecto a ecto NKRY for MR25 MS2000 MR25 PKCO506 red I E connector PKCO506 wate ll p MPS NKRO for MS220 MS220 OPI eerop T push red PKCO506 RN gf l y white PKCOSOS NKR4 t r MS220 MS220 AKU FAA connector red faston MF2 ji T ac NKR4 for MS2000 MS2000 12 AKU 12V MS2
11. sion If the station is in a quiet state a cyclical letter notice rid 302 is displayed or if need be another number of the software version While receiving the station evaluates the signal level S meter If the level is less than 110 dBm the notice rid 302 appears The maximum level is indicated by 0 zero When Error message is running on the display it is a grand error condition when at least one PLL in station is not locked Racom s r o MR25 Service Manual 11 5 MR25 TECHNICAL SPECIFICATIONS 5 MR25 Technical Specifications Frequency ranges Channel spacing Number of channels in working band Method of setting up working frequency Switching time transmit receive Temp range for guaranteed parameters Temp range for guaranteed functionality Atmospheric pressure Relative humidity Supply voltage Current consumption transmission 1W max output Dimensions MR25 only Dimensions MR25 with heat sink and holders Dimensions MR25ET with heat sink and holders Weight MR25 only Weight MR25 with heat sink and holders Weight MR25ET with heat sink and holders Antenna connector Receiver sensitivity for BER 107 Frequency stability Receiver intermodulation response Adjacent channel sensitivity 12 5 kHz Adjacent channel sensitivity 25 0 kHz Spurious response rejection Spurious receiver radiations Receiver spurious response rejection Receiver desensitisation Transmitter power Transmitter ou
12. tput impedance Spurious transmitter emissions Transmitter power in adjacent channels 12 5 kHz Transmitter power in adjacent channels 25 0 kHz Max modulation transmission speed 12 5 kHz Max modulation transmission speed 25 0 kHz Standard interfaces in modem part Max speed on user channels Memory Software diagnostics through the network e measuring receiver signal strength e adjusting output power e monitoring Remote config possibilities all necessary parameters Software modification through the network 146 162 2 162 2 180 MHz 300 360 MHz 400 444 444 493 MHz 25 kHz 12 5 kHz 128 256 software lt 2 ms 25 to 55 C 30 to 55 C 700 1200 hPa 10 90 13 8 V 0 5 A 1 1 A 2 0 A 84x 190X 52 mm 84x190x71 mm 84x 190x97 mm 890 g 1150 g 1360 g mini UHF better than 107 dBm according to ETS300113 gt 70 dB 60dB 70dB gt 70 dB lt 2 nW gt 70 dB 84 dB 0 1 5 W 502 lt 36 dBm lt 60 dBc lt 70 dBc 10 84 kbps 21 68 kbps 3x V 24 without synchronization 115 Kbps async 64 kB SRAM 512 kB FLASH EEPROM yes yes yes yes yes 12 Racom s r o MR25 Service Manual 6 MR25 MECHANICAL SPECIFICATIONS 6 MR25 Mechanical Specifications Y 16 P o he 8 gt MTL NN O
Download Pdf Manuals
Related Search