SRM 9000 Series FM VHF/UHF Mobile Radio Transceiver Revision 9 Hardware SERVICE MANUAL TNM-M-E-0002 ISSUE 1.0 May 2006 ISO9001 Lic.
SRM9000 Series Mobile Radio Transceiver Rev 9 Hardware TNM-M-E-0002 ~ Iss 1.
SRM9000 SERIES SERVICE MANUAL TABLE OF CONTENTS APPENDICES........................................................................................................................................ III DECLARATION..................................................................................................................................... IV COPYRIGHT .........................................................................................................................................
SRM9000 SERIES SERVICE MANUAL 3. 3.1 3.2 3.3 3.4 3.5 3.6 4. 4.1 4.2 T EST EQUIPMENT ..................................................................................................................... 33 T EST SET-UP ........................................................................................................................... 35 4.2.1 COMMS Set up.............................................................................................................. 36 4.2.2 Radio Preparation .....
SRM9000 SERIES SERVICE MANUAL 6.1 ISSUE 9 CIRCUIT DIAGRAMS ......................................................................................................
SRM9000 SERIES SERVICE MANUAL Declaration The performance figures quoted are subject to normal manufacturing and service tolerances. The right is reserved to alter the equipment described in this manual in the light of future technical development. Copyright All rights reserved. No part of this publication may be reproduced in any form or by any means without the prior permission of TMC Radio.
SRM9000 SERIES SERVICE MANUAL Document History Issue Date Comments 1 January 2006 Initial issue List of Associated Publications Document No. Description Issue TNM-I-E-0005 SRM9000 Series Installation Instructions 5 TNM-P-E-004 Selcall Product Manual 2.
SRM9000 SERIES SERVICE MANUAL Warnings and Cautions WARNING Compliance with RF Energy Exposure Standards: To minimise exposure to RF fields during equipment service and repair, the antenna terminal of the SRM9000 radio should be connected to a suitable non-radiating RF load when the transmitter is in use. WARNING SRM9000 radio equipment is to be connected only to 12-volt negative earth systems. In vehicles with a 24-volt supply, an approved 24V/12V converter must be used.
SRM9000 SERIES SERVICE MANUAL 1. INTRODUCTION 1.1 GENERAL The SRM9000 series of FM mobile radio transceivers is designed for PMR and Trunked operation in VHF and UHF radio systems. The system is available in a number of functional variants. Each variant uses the standard SRM9000 mobile transceiver, which is software configured for different control ancillaries.
SRM9000 SERIES SERVICE MANUAL 1.4 PRODUCT VARIANTS AND FACILITIES Product variants and facilities are detailed in Table 1-1, Table 1-2 and Table 1-3.
SRM9000 SERIES SERVICE MANUAL Table 0-2 Conventional-PMR Variants Feature: Model: 9005 9010 9020 9022 9025 9030 Channels 1000 10 100 + 1000 1000 1000 Signalling CTCSS/DCS CTCSS/DCS ANI CTCSS/DCS Selcall CTCSS/DCS Selcall CTCSS/DCS Selcall CTCSS/DCS Selcall Attack Operation - Yes Yes Yes Yes Yes DTMF Encode - 2 Fixed Seq 2 Fixed Seq Yes Yes Yes MPT1327 Trunking Yes Programmable User selectable User selectable User selectable User selectable PTT Limit Timer with war
SRM9000 SERIES SERVICE MANUAL Table 0-3 Trunked Variants Feature: Model: 9005 9010 9020 9022 9025 9030 Channels 1024 channels in 50 sub-bands Frequency Bands Specifically: 136-174MHz, 400-450MHz (and possible in all other bands) Background Hunt and Vote-Now Yes Yes Yes Yes Yes Yes MPT1343 dial strings Yes Yes Yes Yes Yes Yes ANN Numbering - - - Yes Yes Yes Phonebook Memories 250 10 100+ 250 250 250 User Phonebook Recall entries configured by FPP only Recall entries
SRM9000 SERIES SERVICE MANUAL 1.5 SOFTWARE VERSIONS AND NAMING There are various associated items of Software (SW) required for the SRM9000 radio and programmer to operate. This section simply defines the naming rules of the SW files to allow identification and conformity. This allows different versions of SW to be distributed and co-exist without confusion. The SRM9000 Transceiver has three items of SW for digital and analogue PMR, Trunking and Alignment.
SRM9000 SERIES SERVICE MANUAL a_a 9022 PMR with ASI Map27option board a_u 9022 PMR with ASI SUP option board a_q 9022 PMR with ASI-G Map27option board tm Standard MPT1343 Trunking. DMAP or No option board ta Standard ANN Trunking. DMAP or No option board tb Basic (9010/9020) MPT1343 Trunking. DMAP or No option board tmg Standard MPT1343 Trunking. Direct GPS option board tag Standard ANN Trunking. Direct GPS option board tbg Basic (9010/9020) MPT1343 Trunking.
SRM9000 SERIES SERVICE MANUAL 1.5.4 Version Number This is a 3-digit number allocated by Engineering to identify the SW version. e.g. 1.5.5 103 = Version 1.03 Exclusions The Programmer SW does not follow the above rules as it is a PC based Program and its version number can be easily identified by starting the SW. Later releases of SW will be backward compatible, unless deliberately not so, in which case a different directory structure/path may be implemented. 1.5.
SRM9000 SERIES SERVICE MANUAL SRM9030 Control Head SW can be displayed on the Control Head by holding the ‘3’ button down when the radio is switched on. This is only implemented in CH V1.06 SW (Oct/2000) and later. SRM9025 Handset SW has a similar method of Version identification. SRM9020 Microphone SW has a similar method of Version identification. SRM9022 Handset SW can be displayed by pressing the top side button when the radio is switched on.
SRM9000 SERIES SERVICE MANUAL Transceiver SW Description, Start-up and Backup-Software 1.5.
SRM9000 SERIES SERVICE MANUAL servicing and that the receiver audio output be kept below 100mW for receiver servicing. Radio performance is not adversely affected by operating without the outer sleeve but there will be some change to performance when the metal cans are removed from the RF sections of the board. On re-assembly, the PA module should be checked for a thin layer of heat-conducting paste. If this is missing or dried-out, it should be replaced prior to re-assembly. 1.
SRM9000 SERIES SERVICE MANUAL Rx Audio O/P: 300mW (not bridged) ≤ 450mA ≤ 470mA ≤ 500mA * 4.0W ≤ 1200mA ≤ 1220mA ≤ 1250mA* Transmit: VHF UHF 25W ≤ 6.5A ≤ 6.5A ≤ 1.5A ≤ 1.5A 1W *Add 250mA to current consumption for Control Head with backlight on.
SRM9000 SERIES SERVICE MANUAL 1.8.2 Transmitter Power Output Any two levels programmable from High Power: 25W Adjustable down to 1W Low Power: 1W Adjustable up to 25W Transmitter Rise Time Less than 40 ms Duty Cycle 1 minute transmit: 4 minutes receive Spurious Emissions < 0.25uW (9kHz to 1GHz) < 1.0uW (1GHz to 4GHz) Residual Noise 60% deviation. CCITT Weighted 25kHz Channel Spacing >45dB 12.
SRM9000 SERIES SERVICE MANUAL 1.8.3 ETS Receiver Sensitivity AS4295 ≤0.5µV PD (-113dBm) for 20dB SINAD ≤0.3µV PD (-117.5dBm) for 12dB SINAD ≤0.5µV PD (-113dBm) for 20 dB Quieting. Adjacent Channel Selectivity 25kHz Channel Spacing: >73dB 25kHz Channel Spacing: >73dB 12.5kHz Channel Spacing: >60dB 12.
SRM9000 SERIES SERVICE MANUAL Signalling 1.8.4 1.8.4.1 CTCSS All 38 standard CTCSS Tones are supported as per the table below. Identifier Frequency Identifier Frequency Identifier Frequency Q 67.0 C 107.2 0 167.9 R 71.9 L 110.9 1 173.8 S 74.4 D 114.8 2 179.9 T 77.0 M 118.8 3 186.2 U 79.7 E 123.0 4 192.8 I 82.5 N 127.3 5 203.5 V 85.4 F 131.8 6 210.7 A 88.5 O 136.5 7 218.1 W 91.5 G 141.3 8 885.7 J 94.8 P 146.2 9 223.6 = 97.4 H 151.
SRM9000 SERIES SERVICE MANUAL Decoder Bandwidth Not greater than ±3.0% Deviation Sensitivity Less than 6.0% of system deviation (for decode with full RF quieting) Noise Immunity Less than 500ms dropout per minute at 10dB SINAD (CTCSS tone deviation 10% of system deviation. RF deviation 60% at 1000Hz). False Decode Rate Less than 5 false decodes per minute (no carrier input) Talk-off For no dropouts in one minute, interfering tone at 90% of system deviation (CTCSS tone at 10% of system deviation).
SRM9000 SERIES SERVICE MANUAL Selcall Tone Frequency Table Tone CML ST500 SIGTEC SIGTEC SEPAC CML ST500 SIGTEC CCIR CCIR CCIR CCIRH CCIR EEA EEA EEA 0 1981 1981 1981 1981 1981 1981 1981 1981 1 1124 1124 1124 1124 1124 1124 1124 1124 2 1197 1197 1197 1197 1197 1197 1197 1197 3 1275 1275 1275 1275 1275 1275 1275 1275 4 1358 1358 1358 1358 1358 1358 1358 1358 5 1446 1446 1446 1446 1446 1446 1446 1446 6 1540 1540 1540 1540 1540 1540 154
SRM9000 SERIES SERVICE MANUAL Tone SEPAC ST500/CML ST500 SIGTEC SIGTEC SEPAC ST500 ZVEI-3 ZVEI-3 DZVEI DZVEI NATEL EIA EIA EIA 0 2200 2400 2200 2200 1633 600 600 600 1 970 1060 970 970 631 741 741 741 2 1060 1160 1060 1060 697 882 882 882 3 1160 1270 1160 1160 770 1023 1023 1023 4 1270 1400 1270 1270 852 1164 1164 1164 5 1400 1530 1400 1400 941 1305 1305 1305 6 1530 1670 1530 1530 1040 1446 1446 1446 7 1670 1830 1670 1670 1209
SRM9000 SERIES SERVICE MANUAL 1.8.4.5 DCS Data rate 134 bits per second, frequency modulated 7.46ms/bit 171.6ms per codeword continuously repeating 0.5kHz for 12.
SRM9000 SERIES SERVICE MANUAL 1.8.5 Environmental Note: Operation of the equipment is possible beyond the limits stated but is not guaranteed.
SRM9000 SERIES SERVICE MANUAL 2. SERVICE PHILOSOPHY 2.1 SERVICE CONCEPT The SRM9000 series has been designed to provide low cost trunked, non-trunked analogue and digital speech mobile transceivers, using common core electronics, software and interfacing. It is a requirement that once the customer has purchased equipment, TMC Radio can follow this by providing an ongoing, high level of customer support together with a competitive and professional servicing activity.
SRM9000 SERIES SERVICE MANUAL The customer undertakes not to disclose any part of the software to third parties without the Company's written consent, nor to copy or modify any software. The Company may, at its discretion, carry out minor modifications to software. Major modifications may be undertaken under a separate agreement, and will be charged separately.
SRM9000 SERIES SERVICE MANUAL 3. 3.1 TECHNICAL DESCRIPTION RECEIVER Refer to Figure 3-1. 3.1.1 Front End Filters and RF Amplifier The receiver input signal from the antenna passes through the harmonic filter and antenna switch. With the mobile in receive mode, diodes D580, D540a and D541a in the antenna switch are reverse biased allowing the receiver input signal to be coupled through to the receiver front-end with minimal loss.
© TMC Radio 2006 page 23 SPKR_OUT 2 SPKR_OUT 1 AUDIO_OUT 3 (Option Audio) AUDIO_OUT 1 (Option Audio) AUDIO_OUT 2 ( H/S Audio) Antenna Filter L582, L584 & L585 Speaker Amp U805 EN 3 Rx Audio Mode3 U806B (Rev9C+ only) EN 1 Rx Audio Mode1 U806C (Rev9C+ only) . From PLA Antenna Switch D580/ D540/D541 To TX PA RX_PSU . CPP AF Amp U802A SPKR_ON De-emphasis Network EN 2 RF Amp Q400 TUNE_1, 2, 3 & 4 RX VCO Switch Q601 RX VCO Q600 Rx Audio Mode 2 U302C Speaker Switch Q810/ Q811/Q813 .
SRM9000 SERIES SERVICE MANUAL 3.1.4 Receiver Audio Processing The base band audio from the IQ Demodulator is applied to a differential amplifier that cancels out DC offsets and converts the balanced demodulator I/Q output signals to unbalanced inputs for the CODEC U800. All receiver audio processing and filtering functions are performed by the CODEC under the control of the DSP.
SRM9000 SERIES SERVICE MANUAL 3.2 TRANSMITTER Refer to Figure 3-2. 3.2.1 Drivers and PA Stages The RF output level from the VCO T/R switch D611a is typically +5dBm (UHF) and +8dBm (VHF). Tx buffers Q606/Q612 increase this level to provide approximately 10dBm of drive power to the Tx driver Q571. The Tx driver stage provides a maximum of 17dBm of drive to the PA module and provides part of the power control function in conjunction with the first stage of the PA module.
SRM9000 SERIES SERVICE MANUAL 13V8_UNSW From L8 TX Current Sense to PLA Standard Microphone External Accessory Audio TX_CURRENT Directional Coupler TX PA U500 Switch U801A MOD_SW TX_MODE TX/RX AF Control From PLA ADC/DAC/ CODEC U800 DATA_EN Audio Gate U801B From PLA/DSP TX VCO Switch Q603 TX_MOD TX VCO Q602 VCO Buffer Q604/ Q605 RX/TX AF Switch U801C I Q TX/RX Switch D610/ Q611 To RX Mixer LO1_RX TX Buffer Amp Q606/ Q612 Internal MIC/ External Audio Control From PLA TX Driver Q571
SRM9000 SERIES SERVICE MANUAL The frequency synthesiser consists of one transmitter and two receiver voltage controlled oscillators, loop filters, varactor negative bias generator, reference oscillator and an integrated dual phase locked loop device U701. 3.3.2 PLL The PLL device contains two prescalers, programmable dividers and phase comparators to provide a main and auxiliary PLL.
SRM9000 SERIES SERVICE MANUAL - The divided reference signal is differentiated and discharges C744 via Q711 after which Q711 is turned off allowing C744 to recharge via constant current source Q712/Q713. Schmitt Trigger comprising Q714 to Q716 converts the modulation combined with the saw tooth ramp to a square wave output, the duty cycle of which is controlled by the ramp slope and modulation.
SRM9000 SERIES SERVICE MANUAL 3.4.
BAT_SENSE © TMC Radio 2006 Reset U200 Clock X200 Rx Audio CODEC U800 DSP U201 Tx Audio XTAL_SHIFT Synthesiser U701 Flash Memory U202 LOCK PLA U300 FUNCTION_EN AFC TX_Power MOD BAL AGC Tune 1 - 4 page 30 TX_DATA RX_DATA Bit Inputs Bit Outputs Serial port Serial port 1. PTT_IN1 2. PTT_IN2 3. GAIN 4. DC PWR_STATUS 5. PWR_ON 1. SPKR_ON 2. PA_ON 3. TX_MODE 4. OPTION ON/OFF 5. PWR_OFF 6. ANALOG GATE CONTROLS 7.
SRM9000 SERIES SERVICE MANUAL 3.6 POWER SUPPLIES Power On Function 3.6.1 The unregulated 13.8V DC input (13V8_UNSW_F) is routed directly to all high current devices and is then switched via FET Q900 to provide BAT_SW supply for all other circuits. The output from Q900 feeds three low dropout series regulators and switched battery voltage These regulated supplies power auxiliary supplies as well as the negative voltage generator. The radio ON/OFF function is achieved through Q902, Q908 and Q909.
SRM9000 SERIES SERVICE MANUAL 3.6.2.3 3.3V Regulator U912 Regulated 3.3V supply (3V3) • Reset U200 • PLA U300 • DSP U201 • Flash U202 • Digital supply for CODEC U800 Regulated 3.3V supply (3C3) • Analogue supply for CODEC U800 Regulated 3.3V supply (3Q3) • I/Q demodulator U401 Regulated 3.3V supply (3P3) • Digital supply for PLL U701 Unregulated 13.8V (13V8_UNSW_F) • Tx PA module U500 • Antenna changeover switch Q541/542/543 • Rx mute switch Q811 • Rx audio power amplifier U805 3.6.
SRM9000 SERIES SERVICE MANUAL 4. ALIGNMENT (LEVEL 3 SERVICE ONLY) This procedure is applicable to all versions of SRM9000 mobile transceivers. Caution Preparing the radio for alignment will erase from the radio all customer PMR and Trunking configuration data (channel, signalling information etc). The only data retained by the Alignment Tool is the factory alignment data for the radio (DAC settings for Tx power, front-end tuning, etc).
SRM9000 SERIES SERVICE MANUAL AF Generator BNC (F) Connector PC 25-9 Way Adaptor White (8) (Not Used) To SRM9000 S1 22uF to 47uF Tant. or Elect + 470E R Green(4) DB25 PRM80 Programming Cable P/N 9525-001-00016 RJ45 White 8 Orange 7 Black 6 Red 5 Green 4 Yellow 3 Blue 2 Brown 1 Mic Audio in Ground Handset AF Output 13.8V Switched Mic Ground On/Off Rx Data Tx Data Access and modify cable as shown 9000_49/2 Figure 4-1 SRM9000 Programming & Alignment Breakout Box .
SRM9000 SERIES SERVICE MANUAL 4.2 TEST SET-UP Noise & Distortion Meter SRM9000 CRO PC 8 15 SRM9000 Speaker O/P Breakout Box 7 14 6 13 5 P2 (DB15M) 12 4 11 3 10 2 9 1 S1 RJ45 + - 13.8V DC Power Supply SRM9000 Programming and Alignment Breakout Box S5 Antenna Skt Coax (<200 mm) AF Generator Radio Transceiver Test Set 9000_49 Figure 4-3 Test Set-up 1. Connect the radio to the test equipment as shown in 2. 3. 4. Figure 4-3. 5. Switch on the DC Power Supply.
SRM9000 SERIES SERVICE MANUAL 4.2.1 1. COMMS Set up Copy the SRM9000 Alignment Tool Computer Software file to the PC hard drive and run the program The Alignment Tool Opening Menu is displayed. 2. Go to the Options menu and choose Comms Setup. 3. The Comms Setup dialogue box is displayed. Select the Comms Port setting appropriate to the configuration of your PC and choose üOK.
SRM9000 SERIES SERVICE MANUAL 4.2.2 Radio Preparation Radio parameters are to be aligned sequentially as detailed in this procedure. 1. At the Opening Menu, select the Align Menu and choose Prepare/Read Radio. 2. The WARNING is displayed. Choose No if you want to save the configuration and use the FPP software to read and save the data to a file. Choose Yes if you want to proceed and go to step 3. 3. The radio alignment data is read (indicated by percentage bar) and stored.
SRM9000 SERIES SERVICE MANUAL 4.2.3 Alignment Procedure Radio alignment must be done in the sequence detailed in the following paragraphs. This alignment assumes that the radio is functioning normally. 4.2.3.1 VCO DAC Alignment 1. Select the VCO DAC page. 2. Select Auto Align. The Synth DAC Rx slider will automatically adjust its value for each receiver alignment frequency to set the VCO loop filter value between 140 and 150. 3. Select PTT and then select Auto Align.
SRM9000 SERIES SERVICE MANUAL 4.2.3.2 TCXO (Radio Netting Adjustment) 1. Select the Mute/TCXO page. 2. Select PTT. 3. Adjust the TCXO slider to ensure that the transmit frequency error is within 50Hz for the selected channel (to be measured on the RF Test Set frequency counter).
SRM9000 SERIES SERVICE MANUAL 4.2.3.3 Rx Front End 1. Ensure that the TCX0 Alignment has been done before proceeding with this section. 2. Select the Rx Front End Page. 3. Select Open Mute. 4. Set the Volume slider to 15. Speaker audio should now be visible on the Scope. If required readjust the Volume slider to a suitable level. 5. Set the Signal Generator to the Channel 0 carrier frequency, with a 1000Hz modulation signal, a deviation of ±2 kHz and an RF level of -90dBm. 6. Select Channel 0.
SRM9000 SERIES SERVICE MANUAL 4.2.3.4 Mute Adjustment Note. This adjustment has default setting of 1000/2600 and should not need changing except for specific requirements. 1. Select the Mute/TCXO page and select Open Mute. 2. Set the RF signal generator to the receiver alignment frequency, and adjust the RF level such that the desired mute opening SINAD (typically 10dB SINAD) is achieved. 3. Select Close Mute and remove the RF input from the radio. 4.
SRM9000 SERIES SERVICE MANUAL 4.2.3.5 RSSI 1. Select the RSSI Cal page. 2. Set the Signal Generator for a RF output level of -90dBm and 2kHz deviation at the specified frequency. 3. Activate the Store RSSI button. The receiver RSSI threshold setting is calibrated.
SRM9000 SERIES SERVICE MANUAL 4.2.3.6 Tx Power 1. Select Tx Power/Mod page. 2. Select Channel 0. 3. Select the 1W power level. 4. Press the PTT button. 5. Adjust the Tx Final Value slider for a power output of 1W. 6. Repeat step 5 for the remaining 3 Channels (1, 2, & 3). 7. Select the 5W power level. 8. Adjust the Tx Final Value slider for a power output of 5W. 9. Repeat step 8 for the remaining 3 Channels (2, 1& 0). 10. Select the 25W power level. 11.
SRM9000 SERIES SERVICE MANUAL 4.2.3.7 Modulation 1. Select Tx Power/Mod page. 2. Select Channel 0. 3. Select the 1W power level. 4. Set the microphone input signal from the Audio Generator to 1000Hz at 400 mV RMS. 5. Adjust the VCO Modulation Limit slider for a maximum peak deviation of ±2.3kHz 6. Reduce the microphone input level to 40mV RMS and check that the deviation is within the range ±1.25 kHz to ±1.75 kHz. 7. Repeat steps 2 to 7 inclusive for the remaining 3 Channels (1, 2, & 3). 8.
SRM9000 SERIES SERVICE MANUAL 4.2.3.8 Programming When all channels have been aligned the radio is programmed with the new alignment data: 1. Select Align and choose Write Alignment. 2. A warning message is displayed. 3. Choose Yes. New alignment data is written to the radio. 4.2.3.9 Customers Radio Personality Data If the Customers Radio Personality Data was saved as a separate file, use the FPP Programmer to write this data to the radio.
SRM9000 SERIES SERVICE MANUAL 5. REPLACEABLE PARTS 11 4 6 5 11 7 8 3 11 2 1 4 9000_51b 10 9 Figure 5-1 Replaceable Parts 5.
SRM9000 SERIES SERVICE MANUAL Ident Description 5.2 Part Number Transient Suppressor Diode D900 1 6102 012 00031-0 Transmit Receive Switch Q541 1 3513 999 00006 ON/OFF FET Q7, Q900 1 6102 062 00051-0 BAND-SPECIFIC PARTS Ident 6.
SRM9000 SERIES SERVICE MANUAL 6.11 KM Band Transmitter 6.30 R2 Band VCO’s 6.12 KM Band VCO’s 6.31 R2 Band Synthesizer 6.13 KM Band Synthesizer 6.32 TU Band Receiver 6.14 R1 Band Receiver 6.33 TU Band Transmitter 6.15 R1 Band Transmitter 6.34 TU Band VCO’s 6.16 R1 Band VCO’s 6.35 TU Band Synthesizer 6.17 R1 Band Synthesizer 6.36 UW Band Receiver 6.18 R2 Band Receiver 6.37 UW Band Transmitter 6.19 R2 Band Transmitter 6.38 UW Band VCO’s 6.
SRM9000 SERIES SERVICE MANUAL APPENDIX A - GLOSSARY OF TERMS A summary of common radio terms and some other terms used in this document, and their meanings, are given below. 3RP Trunking Signalling Specification relating to trunked networks for shared use. Used primarily for networks in France. ADC Analogue to Digital Converter. AFC Automatic Frequency Control. AGC Automatic Gain Control. Alarm A Selcall sequence sent from subscriber equipment to indicate an Emergency situation.
SRM9000 SERIES SERVICE MANUAL Call Back A request, sent by the dispatcher, to a unit requesting that the unit calls the dispatcher back. CCSC Control Channel System Codeword. Channel Spacing The distance (in Hz) between the defined frequency channels. CHEKKER System Interface Specification for Trunked Networks in Germany. CLIM Call Limit Time; time limit on calls made. Normally this is defined by the Call Time Limit parameter but can by overridden by the TSC depending upon the setting of TSCLIM.
SRM9000 SERIES SERVICE MANUAL provides a simple method of sending messages to selected receivers only and allows several different networks to use the same frequencies. Decode Reception of signalling. Either Selcall where encoded tone frequencies are decoded and identified as specific tones digits or CTCSS/DCS where tones are analysed to see if the channel should be opened.
SRM9000 SERIES SERVICE MANUAL them being allocated to calls when the called party is not present to deal with the call. PLA Programmable Logic Array. FPP Field Personality Programmer.
SRM9000 SERIES SERVICE MANUAL Hash (#) digits These digits are used for two purposes: • For Selcall identities (encode and decode) - known as User Id digits. These digits are replaced by the user id entered at switch on (if enabled) • Use in DTMF dialled strings - their use is network dependent to access special services. IDENT A 13 bit number used for Identification purposes.
SRM9000 SERIES SERVICE MANUAL Password An optional password system available on the radio. This feature is only available if the radio does has a display and a keypad. To make available: go to Hardware Components, Terminal Settings and set Product Type to one which has a display and a keypad. PFIX The 7 most significant bits of an MPT1327 address number. Normally same fleet units have same prefix. Relates to individual and group address numbers. PLL Phased Locked Loop.
SRM9000 SERIES SERVICE MANUAL • If the Acknowledge property of a Decode Identity is set to 'Auto Interrogate' or 'Transpond & Auto Interrogate' then the Auto Interrogate encode identity is transmitted. Roaming This is a process that allows changing between regional trunking systems which have different Operator Identities (OPID 's). Not allowed on MPT1343 Systems. RSSI Received Signal Strength Indicator.
SRM9000 SERIES SERVICE MANUAL SW Software. SYS System Identity Code part of the CCSC. TCXO Temperature Compensated Crystal Oscillator. Temporary Temporary Registration; a process carried out by the Dispatcher due to some system failure that prevents it from carrying out normal registration. The radios will recognise this temporary registration mode but will otherwise use the network in the same way as if they were registered.
SRM9000 SERIES SERVICE MANUAL User Identity This is a sequence of up to four digits entered by the user when the Radio is switched on, if this option is programmed. These digits are then substituted into any transmitted Selcall identity which includes # digits. VCO Voltage Controlled Oscillator. Vote Method used to compare the signal strength on a current channel with another specified channel and then to choose the channel having the stronger signal.
