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GM950E/GM950i
Mobile Radio
Service Manual
6804111J39-B
Issue: May, 2000

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Table of Contents
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Summary of Contents for Motorola GM950E

  • Page 1 GM950E/GM950i Mobile Radio Service Manual 6804111J39-B Issue: May, 2000...
  • Page 3 Cautions and Warnings CAUTION ELECTROSTATIC SENSITIVE DEVICES PRECAUTIONS SHOULD BE TAKEN TO MINIMIZE THE RISK OF DAMAGE BY ELEC- TROSTATIC DISCHARGE TO ELECTROSTATIC SENSITIVE DEVICES (ESDs). ANY DEVICES EMPLOYING METAL OXIDE SILICON (MOS) TECHNOLOGY ARE PARTICULARLY SUSCEPTIBLE. CIRCUIT DIAGRAMS MARKED WITH THE ABOVE SYMBOL INDICATE ELECTRONIC CIRCUITS (PECs) FOR WHICH ESD HANDLING PRECAUTIONS ARE NECESSARY.
  • Page 4 Cautions and Warnings...
  • Page 5: Safety Warnings

    Cautions and Warnings SAFETY WARNINGS THE ELECTRICAL POWER USED IN THIS EQUIPMENT IS AT A VOLTAGE HIGH ENOUGH TO ENDANGER LIFE. BEFORE CARRYING OUT MAINTENANCE OR REPAIR, PERSONS CONCERNED MUST ENSURE THAT THIS EQUIPMENT IS ISOLATED FROM THE ELECTRICAL SUPPLY AND TESTS ARE MADE TO ENSURE THAT ISOLATION IS COMPLETE.
  • Page 6 Cautions and Warnings...
  • Page 7: Introduction

    Contents Service Manual Contents Chapter Introduction Gives a brief introduction into the manual and the service policy. Model Chart and Accessories Provides list of models and accessories available for the mobile radio. Maintenance Describes how to disassemble/assemble the radio for maintenance purposes and gives details on safety precautions.
  • Page 8 Contents viii Service Manual...
  • Page 9 How to Use This Manual ................1 Warranty and Service Support ..............1 Waranty Period .................... 1 After Warranty Period .................. 1 Piece Parts ....................2 Technical Support..................2 GM950E/GM950i Technical SpeciÞcation ..........2 General ....................... 2 Transmitter....................3 Receiver...................... 3 Introduction...
  • Page 10 Table of Contents 1-ii Introduction...
  • Page 11: Scope Of Manual

    In instances where the product is covered under a "return for replacement" or "return for repair" warranty, a check of the product should be performed prior to shipping the unit back to Motorola. To ensure the product has been correctly programmed or has not been subjected to damage outside the terms of the warranty.
  • Page 12: Piece Parts

    Aftermarket Division (AAD). If a generic part is listed or only a part description is listed, the part is not normally available from Motorola. If a parts list is not included, this generally means that no user-serviceable parts are available for that kit or assembly. All orders for parts/information should include the complete Motorola identiÞcation number.
  • Page 13: Transmitter

    GM950E/GM950i Technical SpeciÞcation Transmitter SPECIFICATION ITEM TYPICAL VALUE Channel Spacing 12.5 or 20/25 kHz Output Power 5-25W Modulation Limiting <±2.5kHz (12.5kHz); <±4kHz (20kHz); <±5kHz (25kHz) FM hum & noise (CCITT) >40dB (12.5kHz); >45dB (25kHz) CCITT Conducted/Radiated Emission <0.25uW (0.1...1000MHz); <1uW (1...4GHz) Adjacent Channel Power <-60dB (12.5kHz);...
  • Page 14 GM950E/GM950i Technical SpeciÞcation Introduction...
  • Page 15: Table Of Contents

    Table of Contents Chapter 2 Model Chart and Accessories Table of Contents Paragraph Page Overview..................... 1 Model Chart ....................1 Accessories....................2 Mechanical Hardware Kits: ................2 Microphones: ....................2 Speakers:..................... 2 Cables:......................2 Other:......................2 Model Chart and Accessories...
  • Page 16 Table of Contents 2-ii Model Chart and Accessories...
  • Page 17: Model Chart

    Overview Overview This chapter lists the models and accessories available for the GM950E/GM950i mobile radio. Model Chart GM950E/GM950i 136-174 MHz VHF 403-470 MHz UHF X = Indicates one of each required Item Description PMBN4039_ Packaging Kit GCN6103_ Control Head Model A2 Non-Display...
  • Page 18 Accessories Accessories Mechanical Hardware Kits: GLN7324 Low ProÞle Trunnion kit (Standard) GLN7317 High ProÞle Trunnion kit GLN7320 In-Dash Mount, DIN installation kit HLN9457 Accessory Connector Facility Kit GLN7325 IP54 seal, Accessory Connector Microphones: GMN6146 Enhanced Compact Microphone (Standard) GMN6148 DTMF Microphone HMN3141 Handset, low cost with Hang-up cup HMN3000...
  • Page 19 Table of Contents Chapter 3 Maintenance Table of Contents Paragraph Page Overview..................... 1 Disassemble the Radio ................1 Remove the Control Head ................1 Remove the Top Cover................1 Remove the Transceiver Board ..............2 Disassemble the Control Head ..............2 Assemble Radio..................
  • Page 20 Table of Contents 3-ii Maintenance...
  • Page 21: Overview

    Overview Overview This chapter explains, step by step, how to disassemble and assemble the radio, to transceiver board level. The chapter also contains a list of test equipment required to service the radio. The procedure for radio alignment and the test setup is also available in this chapter. Disassemble the Radio Remove the Control Head Recess...
  • Page 22: Speakers

    Disassemble the Radio Insert a small ßat blade screw driver in the side recess of the radio chassis. Lift the top cover over the chassis. Remove the Transceiver Board Protruding Tabs Flex Clip Flex Recess Clip Recess Chassis Recess Printed Circuit Board Top Cover Chassis Transceiver Board...
  • Page 23: Assemble Radio

    Assemble Radio Assemble Radio Assemble the Control Head Protuding Tabs Recess Keypad Recess Speaker Control Head Housing Printed Circuit Board Figure 3-4 Control Head Assembly. Place the keypad onto the board assembly, making sure the keypad is ßush with the board. Make sure the speaker including the gasket is well positioned.
  • Page 24: Exploded View Diagrams And Parts

    Exploded View Diagrams and Parts Recess Figure 3-5 Control Head Replacement. Exploded View Diagrams and Parts Cover Chassis 1502609Y01 incl. Gasket Chassis 3202619Y01 Shield 2602640Y01 Screw M3x10 03S10911A12 Controlhead with Shield or without LCD Main 2602639Y01 Accessory Conn. 16Pin 2804503J01 Power Conn.
  • Page 25 Exploded View Diagrams and Parts Housing 1502611Y02 Keypad 7502614Y02 Gasket 3505932V01 Printed Circuit Board Speaker 5005156Z02 8480573Z01 Figure 3-7 Control Head Model A2. Housing incl. LCD Gasket 1502612Y03 Connector Elastromeric 2802638Y04 top 2802638Y03 bottom Printed Circuit Board 8480479Z01 7202662Y01 Speaker Frame LCD 5005156Z02 0702643Y01...
  • Page 26: Cables

    Service Aids Service Aids The list in table 3-1 includes service aids recommended for working on the GM950E/GM950i radio. Table 3-1 Service Aids. PART No. DESCRIPTION APPLICATION GTF376 Test Box Cable Connects radio to GTF180 test box. GTF374 Combined Interface Connects radio to RLN4008 RIB.
  • Page 27: Test Equipment

    Battery-operated test equipment is recommended when available. The ÒCharacteristicsÓ column is included so that equivalent equipment may be substituted; however, when no information is provided in this column, the speciÞc Motorola model listed is either a unique item or no substitution is recommended.
  • Page 28: Radio Tuning Procedure

    Radio Tuning Procedure Radio Tuning Procedure General The recommended hardware platform is a 386 or 486 DX 33 PC (personal computer) with 8 MBytes RAM, MS DOS 5.0, Windows 3.1, and RSS (Radio Service Software). These are required to align the radio.
  • Page 29: Pa Bias Voltage

    Radio Tuning Procedure The Service windows introduce the concept of the ÒSoftpotÓ, an analog SOFTware controlled POTentiometer used for adjusting all transceiver alignment controls. A softpot can be selected by clicking with the mouse at the value or the slider or by hitting the TAB key until the value or the slider is highlighted.
  • Page 30: Battery Threshold

    Only if the transmitter components have been changed should the following procedure be performed. The advanced power setting technology employed in the GM950E/GM950i makes use of two reference power level settings along with parameters describing the circuit behaviour. To set the reference points requires tuning on two power level settings, a high power level setting, and a low power level setting.
  • Page 31: Reference Oscillator

    Radio Tuning Procedure Reference Oscillator Adjustment of the reference oscillator is critical for proper radio operation. Improper adjustment will not only result in poor operation, but also a misaligned radio that will interfere with other users operating on adjacent channels. For this reason, the reference oscillator should be checked every time the radio is serviced.
  • Page 32: Rated Volume

    Radio Tuning Procedure Table 3-5 Start Value for Front-End Pre-selector Tuning. RF-Band Start Value Maximum Minimum Table 3-6 Normal Test Deviation. Channel Spacing Deviation 12.5 kHz 1.5 kHz 20 kHz 2.4 kHz 25 kHz 3 kHz Rated Volume The rated volume softpot sets the volume at normal test modulation. Set test box (GTF180B) meter selection switch to the ÒAUDIO PAÓ...
  • Page 33: Transmit Deviation Limit

    The transmit deviation limit softpot sets the maximum deviation of the carrier. Unlike other radios, the deviation limit for GM950E/GM950i is set using low frequency (PL) rather than the usual 1kHz tone. The deviation value needs to be set at 7 frequencies across the frequency range. No audio signals need to be injected, as the radio generates a 82.5Hz tone while the deviation limit alignment...
  • Page 34: Transmit Modulation Balance (Compensation)

    Radio Tuning Procedure 7.10 Transmit Modulation Balance (Compensation) Compensation alignment balances the modulation sensitivity of the VCO and reference modulation (synthesizer low frequency port) lines. Compensation algorithm is critical to the operation of signalling schemes that have very low frequency components (e.g. PL) and could result in distorted waveforms if improperly adjusted.
  • Page 35 Table of Contents Chapter 4 Theory of Operation Table of Contents Paragraph Page Overview..................... 1 Controller....................2 General ......................2 Voltage Regulators ..................2 Electronic On/Off ..................3 Mechanical On/Off ..................3 Ignition ......................3 Hook ......................4 Microprocessor Clock Synthesizer .............. 4 Serial Peripheral Interface (SPI) ..............
  • Page 36 Table of Contents Receive Audio Circuits................12 Squelch Detect ..................12 Audio Processing and Digital Volume Control ........... 13 Audio Amplification Speaker (+) Speaker (-) ..........13 Handset Audio ................... 14 Filtered Audio .................... 14 Discriminator Audio (Unfiltered)..............14 Option Board Audio ................... 14 Receive Signalling Circuits..............
  • Page 37 Table of Contents 12.0 Power AmpliÞer (PA) 5-25W ..............25 12.1 Power Controlled Stage ................25 12.2 PA Stages ....................26 12.3 Directional Coupler ................... 26 12.4 Antenna Switch ..................26 12.5 Harmonic Filter..................27 12.6 Power Control ................... 27 13.0 Frequency Synthesis ................
  • Page 38 Table of Contents 4-iv Theory of Operation...
  • Page 39 Overview Overview This section provides a detailed theory of operation for the radio and its components. The main radio is designed to accept one additional option board. This may provide functions such as secure voice/or a signalling decoder. The control head is mounted directly on the front of the radio. The control head contains a speaker, LED indicators, a microphone connector, buttons and dependant of radio type, a display.
  • Page 40 The digital section consists of a microprocessor, support memory, support logic, signal MUX ICs, the On/Off circuit, and general purpose Input/Output circuitry. The closed architecture controller uses the Motorola 68HC11E9 (U0101) for a GM950E radio and the 68HC11E20 for a GM950i radio. In this conÞguration RAM and ROM are contained within the microprocessor itself.
  • Page 41 Controller The voltage 9V3 SUPP is only used in the VHF radio to supply the drain current for the RF MOS FET in the PA. The voltage SW B+ is monitored by the mP through the voltage divider R0641/R0642. Diode VR0641 limits the divided voltage to 5.1V to protect the mP.
  • Page 42 Controller When the IGNITION input goes below 6 volts, Q0421 switches off and R0426, R0427 pull line IGNITION SENSE high. The software is alerted by line IGNITION SENSE to switch off the radio by setting B+ CONTROL to low. The next time the IGNITION input goes above 6 volts the above process will be repeated.
  • Page 43 GP3,5,6 are bidirectional. The software and the hardware conÞguration of the radio model deÞne the function of each port. Some ports are not connected on GM950E radio, refer to appendix B. GP1 can be used as external PTT input or others, set by the RSS.
  • Page 44 Controller C0622 allows the battery voltage to be disconnected for a couple of seconds without losing RAM parameters. Diode D0621 prevents radio circuitry from discharging this capacitor. U0101-22 is the high reference voltage for the A/D ports on the E9/20µP. Resistor R0105 and capacitor C0105 Þlter the +5V reference.
  • Page 45 General CONTROLLER BOARD AUDIO AND SIGNALLING CIRCUITS General Audio Filter IC (AFIC) The AFIC (U0103) used in the controller performs RX/TX audio shaping, i.e. Þltering, ampliÞcation, attenuation. The AFIC is programmable through the SPI BUS (U0103-30/31/33), normally receiving 6 bytes. This programming sets up various paths within the AFIC to route audio signals through the appropriate Þltering, gain and attenuator blocks.
  • Page 46 Transmit Audio Circuits The FLAT TX AUDIO signal from accessory connector U0400-5 is buffered by op-amp U0106-1 and fed to the AFIC U0103-13 through gate U0107-1. Gate U0107-1 is controlled by the µP port PC7 (U0101-42) and selects between FLAT TX AUDIO or signalling signal created by the µP. J0101 J0103-1 J0103-3...
  • Page 47 Transmit Audio Circuits Option Board Audio (GM950i only) The audio coming from the microphone (J0101-16) or the external microphone (J0400-2) is routed through op-amp buffer U0106-2 (128ch only) to the option board connector J0103-3. After option board processing the signal emerges at J0103-1. The source resistor of the option board output and C0145, the ampliÞer inside the AFIC (U0103-9,10) and gain setting resistor R0147 pre-emphasise the signal.
  • Page 48 Transmit Signalling Circuits Transmit Signalling Circuits Refer to Figure 4-2 for reference for the following sections. From a hardware point of view, there are three types of signalling: Sub-audible data (PL / DPL / Connect Tone) that gets summed with transmit voice or signal- ling, DTMF data for telephone communication in trunked and conventional systems, and Audible signalling including Select 5, MPT-1327, MDC, Single Tones.
  • Page 49 Transmit Signalling Circuits High Speed Data and DTMF The High Speed Data and DTMF waveforms are created by the µP U0101 using summer U0105-3. Op-amp U0105-3 and resistors R0121-R0124 add up the three signals coming from the µP pins 58, 59 and 62.
  • Page 50 Receive Audio Circuits Receive Audio Circuits Refer to Figure 4-3 for reference for the following sections. ACCESSORY CONNECTOR FLAT RX AUDIO J0400 AUDIO SPKR + EXTERNAL SPKR - U0401 SPEAKER SPKR- SPKR+ CONTROL HEAD CONNECTOR ATTEN. INTERNAL SPEAKER J0101 HANDSET AUDIO RX AUD OUT UNAT...
  • Page 51 Receive Audio Circuits Audio Processing and Digital Volume Control The receiver audio signal enters the controller section from the IF IC (U5201-28) on DET AUDIO. The signal is AC coupled by C0181 and enters the AFIC via the RX IN pin U0103-7. Inside the AFIC the signal entering RX IN (U0103-7) goes through the audio path while the signal entering PL DPL IN (U0103-8) via C0182 goes through the PL/DPL path.
  • Page 52 Receive Audio Circuits The SPK+ and SPK- outputs of the audio PA have a DC bias which varies proportionately with FLT A+ (U0401-7). FLT A+ of 11V yields DC offset of 5V, and FLT A+ of 17V yields a DC offset of 8.5V. If either of these lines is shorted to ground, it is possible that the audio PA will be damaged.
  • Page 53 Receive Signalling Circuits Receive Signalling Circuits Refer to Figure 4-4 for reference for the following sections. HIGH SPEED DATA CENTER SLICER U0105-2 UNATTEN RX OUT PL CLOCK STROBE MICRO AFIC CONTROLLER U0103 U0101 GEPD_5430 PL DPL DET AUDIO LIMITER FILTER DECODER DISCRIMINATOR AUDIO FROM RF SECTION...
  • Page 54 Receive Signalling Circuits Alert Tone Circuits When the software determines that it needs to give the operator an audible feedback (for a good key press, or for a bad key press), or radio status , it sends an alert tone to the speaker. It does so by sending SPI BUS data to U0103 which sets up the audio path to the speaker for alert tones.
  • Page 55 Receiver Front-End UHF SPECIFIC CIRCUIT DESCRIPTION Receiver Front-End The receiver is able to cover the UHF range from 403 to 470 MHz. It consists of four major blocks: front-end, mixer, Þrst IF section and IF IC. Antenna signal pre-selection is performed by two varactor tuned bandpass Þlters.
  • Page 56 Power AmpliÞer (PA) 5-25W. IF IC (U5201) The Þrst IF signal from the crystal Þlters feeds the IF IC (U5201) at pin 6. Within the IF IC the 45.1MHz Þrst IF signal mixes with the second local oscillator (LO) at 44.645MHz to the second IF at 455 kHz.
  • Page 57 Power AmpliÞer (PA) 5-25W. By controlling the output power of Q5510 and in turn the input power of the following stages the ALC loop is able to regulate the output power of the transmitter. PA Stages The bipolar transistor Q5520 is driven by Q5510. To reduce the collector - emitter voltage and in turn the power dissipation of Q5510 its collector current is drawn from the antenna switch circuit.
  • Page 58 Power AmpliÞer (PA) 5-25W. A high impedance resonant circuit formed by D5551 in off state and L5554, C5559 prevents an inßuence of the receive signal by the PA stages. The high impedance of D5631 in off state doesn«t inßuence the receiver signal. Harmonic Filter The transmitter signal from the antenna switch is channelled through the harmonic Þlter to the antenna connector J5501.The harmonic Þlter is formed by inductors L5552, L5553, and capacitors...
  • Page 59 Frequency Synthesis Loop frequency response is controlled by opamp feedback components R0712 and C0711. Opamp U0701-3 compares the power control voltage PWR CNTL divided by resistors R0717 to R0719 with the voltage limit setting VLTG LIMIT SET from the D/A converter (U0731-13) and keeps the control voltage constant via Q0711 if the control voltage, reduced by the resistive divider (R0717 to R0719), approaches the voltage of VLTG LIMIT SET (U0731-13).
  • Page 60 Frequency Synthesis In order to generate a high voltage to supply the phase detector (charge pump) output stage at pin VCP (U5701-32), a voltage of 13 VDC is being generated by the positive voltage multiplier circuitry (D5701-1-3, C5716, C5717). This voltage multiplier is basically a diode capacitor network driven by two (1.05MHz) 180 degrees out of phase signals (U5701-9 and -10).
  • Page 61 Frequency Synthesis The output signal of the phase detector is a pulsed DC signal which is routed to the charge pump. The charge pump outputs a current at pin 29 (I OUT of U5701). The loop Þlter (which consists of R5715-R5717, C5723-C5725, C5727) transforms this current into a voltage that is applied to the varactor diodes D5741, D5742 and alters the output frequency of the VCO.
  • Page 62 Receiver Front-End VHF SPECIFIC CIRCUIT DESCRIPTION 11.0 Receiver Front-End The receiver is able to cover the VHF range from 136 to 174 MHz. It consists of four major blocks: front-end, mixer, Þrst IF section and IF IC. Antenna signal pre-selection is performed by two varactor tuned bandpass Þlters.
  • Page 63 Power AmpliÞer (PA) 5-25W 11.3 IF IC (U5201) The Þrst IF signal from the crystal Þlters feeds the IF IC (U5201) at pin 6. Within the IF IC the 45.1MHz Þrst IF signal mixes with the second local oscillator (LO) at 44.645MHz to the second IF at 455 kHz.
  • Page 64 Power AmpliÞer (PA) 5-25W In receive mode the PA control line (PWR CNTL) is at ground level and switches off the collector current of Q3641 which in turn switches off the current source transistor Q3642 and the RF transistor Q3511. 12.2 PA Stages The following stage uses an enhancement mode N-Channel MOS FET device (Q3521) and requires...
  • Page 65 Power AmpliÞer (PA) 5-25W 12.5 Harmonic Filter The transmitter signal from the antenna switch is channelled through the harmonic Þlter to the antenna connector J3501.The harmonic Þlter is formed by inductors L3551, L3552, and capacitors C3551 - C3554 This network forms a low-pass Þlter to attenuate harmonic energy of the transmitter to speciÞcations level.
  • Page 66 Frequency Synthesis Rise and fall time of the output power during transmitter keying and dekeying is controlled by the comparator formed by opamp U0701-3. During normal transmitter operation the voltage at U701-3 pin 13 is higher than the voltage at pin 12 causing the output at pin 14 being low and switching off transistor Q0711.
  • Page 67 Frequency Synthesis Output LOCK (U3701-2) provides information about the lock status of the synthesizer loop. A high level at this output indicates a stable loop. IC U3701 divides the 16.8 MHz reference frequency down to 2.1 MHz and provides it at pin 11. This signal is used as clock signal by the controller. The serial interface (SRL) is connected to the microprocessor via the data line SPI DATA (U3701-5), clock line SPI CLK (U3701-6), and chip enable line FRACN CE (U3701-7).
  • Page 68 Frequency Synthesis The output signal of the phase detector is a pulsed DC signal which is routed to the charge pump. The charge pump outputs a current at pin 29 (I OUT of U3701). The loop Þlter (which consists of R3715 - R3717, C3723 - C3725, C3727) transforms this current into a voltage that is applied to the varactor diodes D3732, D3733 (TX), D3751, D3752 (RX) and alters the output frequency of the TX VCO (Q3741) and RX VCO (Q3751).
  • Page 69 Parts List ............. 9 Main Board - UHF GM950E, Controller Schematic Diagram 1 of 2....13 Main Board - UHF GM950E, Controller Schematic Diagram 2 of 2.
  • Page 70 Parts List............57 Main Board - VHF GM950E, Controller Schematic Diagram 1 of 2 ....61 Main Board - VHF GM950E, Controller Schematic Diagram 2 of 2 .
  • Page 71 UHF Main Board Component Side C0104 R0115 J0101 L0114 Y0114 C0105 E5702 R5703 C0117 C0116 C5726 R5724 C5801 Q0137 R5723 C5707 C0115 C0125 R0127 C0127 R5726 C0137 C0110 Q0114 R0104 C0126 C5226 C5728 R0102 R0125 C0114 R5705 R0103 R5221 R0114 Y5702 R5702 C5802...
  • Page 72 UHF Main Board Solder Side C5229 C0119 VR0118 R5223 C5230 C0197 R0118 C5238 R0117 R0157 C0109 R5216 C5718 VR5701 E5701 R5222 C5231 E5703 TP5703 C0150 C0152 C5729 C0111 L0195 C5233 C5700 R0112 R0182 R0181 C5237 R0173 R0111 C0176 J0103 C0153 L0194 C0112 C0175...
  • Page 73 UHF GM950i, Controller Schematic Diagram U0107-3 J0102 MIC_PTT MC14053B R0118 INHIBIT R0116 R0117 U0104-4 SPI_MISO 4.7K 1 XX 74AC08 J0102_3 (GP6) C0118 C0119 SPI_MOSI VR0118 R0119 470pF 470pF U0104-5 C0134 U0105-5 C0132 U0106-5 C0133 U0107-4 C0131 5.1V OPTION_BD_CE ADAPT_5 PWR_GND 0.1uF PWR_GND 0.1uF...
  • Page 74 UHF GM950i, Controller_IO Schematic Diagram (GP1) R0431 R0432 4.7K R0413 R0412 R0461 R0462 4.7K 4.7K (GP3) (GP5) Q0431 Q0461 Q0412 VR0431 C0431 C0461 C0413 .01uF .01uF 470pF C0464 R0463 VR0464 470pF C0412 R0414 VR0411 470pF Q0462 Q0411 R0411 R0464 FLT_A+ (GP2) C0463 R0442...
  • Page 75 UHF GM950i Main Board - Controller UHF GM950i Main Board - Controller Circuit Motorola Circuit Motorola Description Description Part No. Part No. C0101 2113743K15 100nF 16V C0149 2113740F39 33pF 5% 50V C0102 2113741F17 470pF 50V C0150 2311049A05 TANT CP 470nF 10% 25V...
  • Page 76 UHF GM950i Main Board - Controller Circuit Motorola Circuit Motorola Description Description Part No. Part No. C0401 2113743A19 100nF 16V C0472 2113741F17 470pF 50V C0402 2113741F37 3.3nF 50V D0101 4813833C02 DIODE DUAL SOT MMBD6100 C0404 2311049A99 TANT CP 47uF 20% 10V...
  • Page 77 UHF GM950i Main Board - Controller Circuit Motorola Circuit Motorola Description Description Part No. Part No. R0106 0662057A57 2k2 1/16W 5% R0145 0662057A84 30k 1/16W 5% R0107 0662057A25 100 1/16W 5% R0147 0662057B04 180k 1/16W 5% R0108 0662057A89 47k 1/16W 5%...
  • Page 78 UHF GM950i Main Board - Controller Circuit Motorola Circuit Motorola Description Description Part No. Part No. R0407 0662057A77 15k 1/16W 5% U0102 5113805A30 IC 10F8 DCDR/REMUX 74HC138 R0411 0662057A73 10k 1/16W 5% U0103 5102227J35 CHIP CAR TEST 27J35 R0412 0662057A65...
  • Page 79 UHF GM950E, Controller Schematic Diagram U0107-3 J0102 MIC_PTT MC14053B INHIBIT R0116 R0117 R0118 U0104-4 SPI_MISO 4.7K 1 XX 74AC08 J0102_3 (GP6) C0118 C0119 SPI_MOSI VR0118 R0119 470pF 470pF U0104-5 C0134 U0105-5 C0132 U0106-5 C0133 U0107-4 C0131 5.1V OPTION_BD_CE ADAPT_5 PWR_GND 0.1uF...
  • Page 80 UHF GM950E, Controller_IO Schematic Diagram (GP1) R0431 R0432 4.7K R0413 R0412 R0461 R0462 4.7K 4.7K (GP3) (GP5) Q0431 Q0461 Q0412 C0413 C0431 VR0431 C0461 .01uF .01uF 470pF C0464 R0463 VR0464 470pF R0414 C0412 VR0411 470pF Q0462 Q0411 R0464 R0411 FLT_A+...
  • Page 81 UHF GM950E Main Board - Controller UHF GM950E Main Board - Controller Circuit Motorola Circuit Motorola Description Description Part No. Part No. C0101 2113743K15 100nF 16V C0150 2311049A05 TANT CP 470nF 10% 25V C0102 2113741F17 470pF 50V C0151 2113741F17 470pF 50V...
  • Page 82 UHF GM950E Main Board - Controller Circuit Motorola Circuit Motorola Description Description Part No. Part No. C0406 2113741F25 1nF 50V R0106 0662057A57 2k2 1/16W 5% C0407 2109720D14 CER LOW DIST 100nF R0107 0662057A25 100 1/16W 5% C0419 2113741F25 1nF 50V...
  • Page 83 UHF GM950E Main Board - Controller Circuit Motorola Circuit Motorola Description Description Part No. Part No. R0148 0662057B14 470k 1/16W 5% R0426 0662057A89 47k 1/16W 5% R0149 0662057B47 0 1/16W R0427 0662057B47 0 1/16W R0150 0662057A90 51k 1/16W 5% R0431...
  • Page 84 UHF GM950E Main Board - Controller 5-20 Schematic Diagrams and Parts Lists...
  • Page 85 UHF Supply Voltage Schematic Diagram FLT_A+ USW_+5V D0621 FLT_A+_8 R0621 USW_+5V_CL FLT_A+ 2.2K VR0621 C0621 C0622 5.1V 470pF 47uF 9V3_SUPP R0606 U0601 LM2941T LM2941T VOUT R0602 D0631 R0631 U0631 R0601 ON_OFF* 7.5K C0604 LP2951CM C0605 33uF .1uF INPUT C0601 C0602 C0603 OUTPUT 470pF...
  • Page 86 UHF Main Board - Supply Voltage UHF Main Board - Supply Voltage Circuit Motorola Circuit Motorola Description Description Part No. Part No. C0601 2113741F17 470pF 50V R0612 0662057C87 3300 5 1/8 C0602 2109720D14 100nF LOW DIST R0613 0662057C87 3300 5 1/8...
  • Page 87 UHF Main Board - Supply Voltage 5-24 Schematic Diagrams and Parts Lists...
  • Page 88 UHF Power Control Schematic Diagram (CNTL) VAG_7 C0711 R0712 R0702 39000pF PWR_DETECT_7 R0701 R0704 (PA) PWR_DETECT U0701-2 PWR_CNTL_7 MC3403 U0701-4 PWR_CNTL R0711 C0701 C0702 (PA) C0713 100pF 100pF MC3403 100pF C0712 R0716 R0717 43pF 560K R0703 R0714 Q0711 U0701-3 C0716 R0718 3300pF MC3403...
  • Page 89 UHF Main Board - Power Control UHF Main Board - Power Control Circuit Motorola Circuit Motorola Description Description Part No. Part No. C0701 2113740F51 100pF 5% 50V R0712 0662057A37 330 1/16W 5% C0702 2113740F51 100pF 5% 50V R0713 0662057A61 3k3 1/16W 5%...
  • Page 90 5-28 Schematic Diagrams and Parts Lists...
  • Page 91 UHF Power AmpliÞer 5-25W Schematic Diagram L5600 FLT_A+_1 FLT_A+ J5601 L5601 D5601 C5600 C5601 C5604 C5602 C5603 .001uF 330pF 10uF 10uF 100pF C5531 C5548 .01uF .01uF BIAS_VLTG_1 R5541 BIAS_VLTG L5532 L5542 TP5201 C5530 C5622 C5532 R5624 C5547 K9V1_1 R5623 K9V1 100pF .01uF 100pF...
  • Page 92 UHF Main Board - Power AmpliÞer 5-25W UHF Main Board - Power AmpliÞer 5-25W Circuit Motorola Circuit Motorola Description Description Part No. Part No. C5501 2113740F27 10pF 5% 50V C5559 2113741F25 1nF 50V C5502 2113741F49 10nF 50V X7R C5600 2113740A67...
  • Page 93 UHF Main Board - Power AmpliÞer 5-25W Circuit Motorola Circuit Motorola Description Description Part No. Part No. L5541 2460591X01 Coil Square R5611 0662057A73 10k 1/16W 5% L5542 2484657R01 Ferrite Bead R5612 0662057A56 2k 1/16W 5% L5551 2460591X01 Coil Square R5613...
  • Page 94 UHF Synthesizer Schematic Diagram Not Used UHF Synthesizer Schematic Diagram Schematic Diagrams and Parts Lists 5-33...
  • Page 95 UHF Main Board - Synthesizer UHF Main Board - Synthesizer Circuit Motorola Circuit Motorola Description Description Part No. Part No. C5700 2113743K15 100nF 16V Y5V R5702 0662057C61 270 1/16W 5% C5701 2113740F51 100pF 5% 50V R5703 0662057A49 1k 1/16W 5%...
  • Page 96 UHF Main Board - Synthesizer 5-36 Schematic Diagrams and Parts Lists...
  • Page 97 UHF Voltage Controlled Oscillator Schematic Diagram UHF Voltage Controlled Oscillator Schematic Diagram Schematic Diagrams and Parts Lists 5-37...
  • Page 98 UHF Main Board - Voltage Controlled Oscillator UHF Main Board - Voltage Controlled Oscillator Circuit Motorola Circuit Motorola Description Description Part No. Part No. C5731 2113741F25 1nF 50V C5783 2113740F21 5.6pF 5% 50V C5732 2113740F37 27pF 5% 50V C5784 2113740F35...
  • Page 99 UHF Main Board - Voltage Controlled Oscillator Circuit Motorola Circuit Motorola Description Description Part No. Part No. Q5741 4813823A05 TSTR N-CH RF JFET R5788 0662057A01 10 1/16W 5% MMBU310LT1 R5789 0662057A13 33 1/16W 5% Q5751 4813827A07 TRANSISTOR NPN R5791 0662057A41...
  • Page 100 UHF RX-FE Schematic Diagram 9V3_2 R5302 RX_IF_2 L5401 TP5301 RX_IF C5331 C5310 C5311 470nH 330pF C5307 330pF .0033uF TP5302 9V3_2_3 .0033uF R5311 R5401 4.7K R5317 Q5302 L5302 L5402 C5404 470nH 150nH 82pF R5318 R5312 C5302 C5303 R5308 C5313 C5314 L5406 L5408 L5407 L5409...
  • Page 101 UHF Main Board - RX-FE UHF Main Board - RX-FE Circuit Motorola Circuit Motorola Description Description Part No. Part No. C5300 2113740F42 43pF 5% 50V C5331 2113741F13 330pF 50V C5301 2113740F11 2.2pF 5% 50V C5401 2113740F22 6.2pF 5% 50V C5302 2113740F09 1.8pF 5% 50V...
  • Page 102 UHF Main Board - RX-FE Circuit Motorola Description Part No. R5317 0662057A29 150 1/16W 5% R5318 0662057A29 150 1/16W 5% R5319 0662057A13 33 1/16W 5% R5401 0662057A18 51 1/16W 5% T5401 2505515V03 XFMR JEDI MIXER SMD T5402 2505515V04 XMFR MIXER 5:1...
  • Page 103 UHF RX-IF Schematic Diagram UHF RX-IF Schematic Diagram Schematic Diagrams and Parts Lists 5-45...
  • Page 104 UHF Main Board - RX-IF UHF Main Board - RX-IF Circuit Motorola Circuit Motorola Description Description Part No. Part No. C5200 2113740F35 22pF 5% 50V C5237 2113743K15 100nF 16V C5201 2113740F19 4.7pF 5% 50V C5238 2113743K15 100nF 16V Y5V C5202...
  • Page 105 UHF Main Board - RX-IF Circuit Motorola Description Part No. R5225 0662057A25 100 1/16W 5% (12.5kHz) 0662057A61 3k3 1/16W 5% (20/25kHz) U5201 5180207R01 IF IC Y5201 9102651Y01 XTAL FLTR 45.1MHZ 12.5KHz 80dB 9102652Y01 XTAL FLTR 45.1MHZ 20/25KHz 80dB Y5202 9102651Y02 XTAL FLTR 45.1MHZ...
  • Page 106 VHF Main Board Component Side C0104 J0101 L0114 Y0114 E3701 C0105 R3724 R3703 C3726 C0116 C0117 C3801 C3707 C0115 C0137 C0110 Q0114 R3723 C3727 R0102 C5226 R0104 C0114 R3705 Y3702 R0126 C0118 R0116 R0103 C3802 R5221 C3702 R3702 C0194 Q0138 FL5202 D0101 U3801...
  • Page 107 VHF Main Board Solder Side R0157 C0197 C5238 R5223 C5230 C5229 R0117 C0109 R5216 R5222 E3702 C0111 C5237 C5233 R0112 L0195 R0111 J0103 C0176 R0173 C0112 L0194 C0153 C0175 U3701 C3720 C5224 C0199 C5239 Y3701 C0198 C5236 R0148 C0196 C0157 C0147 U0103 U5201...
  • Page 108 VHF GM950i, Controller Schematic Diagram U0107-3 MIC_PTT J0102 MC14053B R0116 R0117 R0118 INHIBIT U0104-4 SPI_MISO 4.7K 1 XX 74AC08 J0102_3 (GP6) C0118 C0119 SPI_MOSI VR0118 R0119 470pF 470pF U0104-5 C0134 U0105-5 C0132 U0106-5 C0133 U0107-4 C0131 5.1V OPTION_BD_CE ADAPT_5 PWR_GND 0.1uF PWR_GND 0.1uF...
  • Page 109 VHF GM950i, Controller_IO Schematic Diagram (GP1) R0431 R0432 4.7K R0413 R0412 R0461 R0462 4.7K 4.7K (GP3) (GP5) Q0431 Q0461 Q0412 VR0431 C0413 C0431 C0461 .01uF .01uF 470pF C0464 VR0464 R0463 470pF R0414 C0412 VR0411 470pF Q0462 Q0411 R0464 R0411 FLT_A+ (GP2) C0463 C0411...
  • Page 110 VHF GM950i Main Board - Controller VHF GM950i Main Board - Controller Circuit Motorola Circuit Motorola Description Description Part No. Part No. C0101 2113743K15 100nF 16V C0149 2113740F39 33pF 5% 50V C0102 2113741F17 470pF 50V C0150 2311049A05 TANT CP 470nF 10% 25V...
  • Page 111 VHF GM950i Main Board - Controller Circuit Motorola Circuit Motorola Description Description Part No. Part No. C0401 2113743A19 100nF 16V C0472 2113741F17 470pF 50V C0402 2113741F37 3.3nF 50V D0101 4813833C02 DIODE DUAL SOT MMBD6100 C0404 2311049A99 TANT CP 47uF 20% 10V...
  • Page 112 VHF GM950i Main Board - Controller Circuit Motorola Circuit Motorola Description Description Part No. Part No. R0106 0662057A57 2k2 1/16W 5% R0145 0662057A84 30k 1/16W 5% R0107 0662057A25 100 1/16W 5% R0147 0662057B04 180k 1/16W 5% R0108 0662057A89 47k 1/16W 5%...
  • Page 113 VHF GM950i Main Board - Controller Circuit Motorola Circuit Motorola Description Description Part No. Part No. R0407 0662057A77 15k 1/16W 5% U0102 5113805A30 IC 10F8 DCDR/REMUX 74HC138 R0411 0662057A73 10k 1/16W 5% U0103 5102227J35 CHIP CAR TEST 27J35 R0412 0662057A65...
  • Page 114 VHF GM950E, Controller Schematic Diagram U0107-3 MIC_PTT J0102 MC14053B R0116 R0117 R0118 INHIBIT U0104-4 SPI_MISO 4.7K 1 XX 74AC08 J0102_3 (GP6) C0118 C0119 SPI_MOSI VR0118 R0119 470pF 470pF U0104-5 C0134 U0105-5 C0132 U0106-5 C0133 U0107-4 C0131 5.1V OPTION_BD_CE ADAPT_5 PWR_GND 0.1uF...
  • Page 115 VHF GM950E, Controller_IO Schematic Diagram (GP1) R0431 R0432 4.7K R0413 R0412 R0461 R0462 4.7K 4.7K (GP3) (GP5) Q0431 Q0461 Q0412 C0413 C0431 VR0431 C0461 .01uF .01uF 470pF C0464 R0463 VR0464 470pF R0414 C0412 VR0411 470pF Q0462 Q0411 R0464 R0411 FLT_A+...
  • Page 116 VHF GM950E Main Board - Controller VHF GM950E Main Board - Controller Circuit Motorola Circuit Motorola Description Description Part No. Part No. C0101 2113743K15 100nF 16V C0150 2311049A05 TANT CP 470nF 10% 25V C0102 2113741F17 470pF 50V C0151 2113741F17 470pF 50V...
  • Page 117 VHF GM950E Main Board - Controller Circuit Motorola Circuit Motorola Description Description Part No. Part No. C0406 2113741F25 1nF 50V R0106 0662057A57 2k2 1/16W 5% C0407 2109720D14 CER LOW DIST 100nF R0107 0662057A25 100 1/16W 5% C0419 2113741F25 1nF 50V...
  • Page 118 VHF GM950E Main Board - Controller Circuit Motorola Circuit Motorola Description Description Part No. Part No. R0148 0662057B14 470k 1/16W 5% R0426 0662057A89 47k 1/16W 5% R0149 0662057B47 0 1/16W R0427 0662057B47 0 1/16W R0150 0662057A90 51k 1/16W 5% R0431...
  • Page 119 VHF GM950E Main Board - Controller 5-68 Schematic Diagrams and Parts Lists...
  • Page 120 VHF Supply Voltage Schematic Diagram FLT_A+ USW_+5V D0621 FLT_A+_8 R0621 USW_+5V_CL FLT_A+ 2.2K VR0621 C0621 C0622 5.1V 470pF 47uF 9V3_SUPP R0606 U0601 LM2941T LM2941T VOUT R0602 D0631 R0631 U0631 R0601 ON_OFF* 7.5K C0604 LP2951CM C0605 33uF .1uF INPUT C0601 C0602 C0603 OUTPUT 470pF...
  • Page 121 VHF Main Board - Supply Voltage VHF Main Board - Supply Voltage Circuit Motorola Circuit Motorola Description Description Part No. Part No. C0601 2113741F17 470pF 50V R0612 0662057C87 3300 5 1/8 C0602 2109720D14 100nF LOW DIST R0613 0662057C87 3300 5 1/8...
  • Page 122 VHF Main Board - Supply Voltage 5-72 Schematic Diagrams and Parts Lists...
  • Page 123 VHF Power Control Schematic Diagram VHF Power Control Schematic Diagram Schematic Diagrams and Parts Lists 5-73...
  • Page 124 VHF Main Board - Power Control VHF Main Board - Power Control Circuit Motorola Circuit Motorola Description Description Part No. Part No. C0701 2113740F51 100pF 5% 50V R0714 0662057A81 22k 1/16W 5% C0702 2113740F51 100pF 5% 50V R0715 0662057A81 22k 1/16W 5%...
  • Page 125 5-76 Schematic Diagrams and Parts Lists...
  • Page 126 VHF Power AmpliÞer 5-25W Schematic Diagram VHF Power AmpliÞer 5-25W Schematic Diagram Schematic Diagrams and Parts Lists 5-77...
  • Page 127 VHF Main Board - Power AmpliÞer 5-25W VHF Main Board - Power AmpliÞer 5-25W Circuit Motorola Circuit Motorola Description Description Part No. Part No. C3501 2113740F25 8.2pF 5% 50V C3611 2113741F25 1nF 50V C3502 2113741F17 470pF 50V C3614 2113741F49 10nF 50V...
  • Page 128 VHF Main Board - Power AmpliÞer 5-25W Circuit Motorola Circuit Motorola Description Description Part No. Part No. L3501 2462587T12 COIL CHIP 56nH R3526 0680194M07 18 1W 5% L3511 2460591C23 Square Coil 16nH 3T R3527 0680194M07 18 1W 5% L3521 2460591C23...
  • Page 129 VHF Synthesizer Schematic Diagram VHF Synthesizer Schematic Diagram Schematic Diagrams and Parts Lists 5-81...
  • Page 130 VHF Main Board - Synthesizer VHF Main Board - Synthesizer Circuit Motorola Circuit Motorola Description Description Part No. Part No. C3701 2113740F51 100pF 5% 50V E3702 2605915V01 SHLD PCB MOUNT C3702 2113741F13 330pF 50V R3701 0662057C61 270 1/16W 5% C3703 2113743E20 0.1uF 10V...
  • Page 131 VHF Main Board - Synthesizer 5-84 Schematic Diagrams and Parts Lists...
  • Page 132 VHF Voltage Controlled Oscillator Schematic Diagram L3742 9V3_1_4 9V3_4 C3733 C3734 R3731 R3740 8.2pF 1.5pF L3731 C3731 .001uF C3743 R3742 C3744 68nH K9V1_4 0.1uF .001uF K9V1 5V_STAB D3731 C3736 C3780 33pF .001uF C3771 R3763 R3781 C3737 C3738 U3741 0.1uF D3732 C3781 56pF 33pF...
  • Page 133 VHF Main Board - Voltage Controlled Oscillator VHF Main Board - Voltage Controlled Oscillator Circuit Motorola Circuit Motorola Description Description Part No. Part No. C3731 2113741F25 1nF 50V C3774 2113740F27 10pF 5% 50V C3733 2113740F25 8.2pF 5% 50V C3775 2113741F17...
  • Page 134 VHF Main Board - Voltage Controlled Oscillator Circuit Motorola Circuit Motorola Description Description Part No. Part No. L3742 2462587T30 COIL CHIP 1uH R3767 0662057C61 270 1/16W 5% L3750 2462587T30 COIL CHIP 1uH R3768 0662057A59 2k7 1/16W 5% L3751 2462587T30 COIL CHIP 1uH...
  • Page 135 VHF RX-FE Schematic Diagram VHF RX-FE Schematic Diagram Schematic Diagrams and Parts Lists 5-89...
  • Page 136 VHF Main Board - RX-FE VHF Main Board - RX-FE Circuit Motorola Circuit Motorola Description Description Part No. Part No. C3300 2113741F37 3.3nF 50V D3304 4805649Q13 VCTR 1SV228 SOT23 C3301 2113740F19 4.7pF 5% 50V D3331 4880174R01 QUAD SOIC 8 PIN...
  • Page 137 VHF Main Board - RX-FE Circuit Motorola Description Part No. T3301 2505515V03 XFMR JEDI MIXER SMD T3302 2505515V03 XFMR JEDI MIXER SMD 5-92 Schematic Diagrams and Parts Lists...
  • Page 138 VHF RX-IF Schematic Diagram VHF RX-IF Schematic Diagram Schematic Diagrams and Parts Lists 5-93...
  • Page 139 VHF Main Board - RX-IF VHF Main Board - RX-IF Circuit Motorola Circuit Motorola Description Description Part No. Part No. C5200 2113740F35 22pF 5% 50V C5237 2113743K15 100nF 16V C5201 2113740F19 4.7pF 5% 50V C5238 2113743K15 100nF 16V Y5V C5202...
  • Page 140 VHF Main Board - RX-IF Circuit Motorola Description Part No. R5225 0662057A25 100 1/16W 5% (12.5kHz) 0662057A61 3k3 1/16W 5% (20/25kHz) U5201 5180207R01 IF IC Y5201 9102651Y01 XTAL FLTR 45.1MHZ 12.5KHz 80dB 9102652Y01 XTAL FLTR 45.1MHZ 20/25KHz 80dB Y5202 9102651Y02 XTAL FLTR 45.1MHZ...
  • Page 141 Control Head K D0843 D0868 D0866 D0867 D0842 D0841 J0803 D0844 D0848 D0847 D0846 D0845 D0864 D0863 D0862 D0861 D0865 Control Head ÔKÕ Component Side R0813 Q0843 C0826 R0812 D0825 R0845 R0811 R0814 Q0841 R0841 R0846 VR0809 R0843 VR0801 Q0862 Q0842 J0801 U0841...
  • Page 142 Control Head K Schematic Diagram Control Head K Schematic Diagram Schematic Diagrams and Parts Lists 5-99...
  • Page 143 Main Board - Control Head K Main Board - Control Head K Circuit Motorola Circuit Motorola Description Description Part No. Part No. C0801 2113741F17 470pF 50V X7R R0845 0662057A89 RES CHP 47k 1/16W 5% C0802 2113741F17 470pF 50V X7R R0846...
  • Page 144 5-102 Schematic Diagrams and Parts Lists...
  • Page 145 Control Head P H0931 D0943 D0956 D0957 D0964 D0953 D0961 D0965 D0969 D0968 D0941 D0942 D0966 D0954 D0958 D0962 D0970 J0903 D0952 D0944 D0960 R0902 D0951 D0955 D0959 D0963 D0967 Control Head ÔPÕ Component Side D0925 R0945 R0912 R0946 Q0943 R0911 R0913 R0922...
  • Page 146 Control Head P Schematic Diagram Control Head P Schematic Diagram Schematic Diagrams and Parts Lists 5-105...
  • Page 147 Main Board - Control Head P Main Board - Control Head P Circuit Motorola Circuit Motorola Description Description Part No. Part No. C0901 2113741F17 470pF 50V R0925 0662057A65 4k7 1/16W 5% C0902 2113741F17 470pF 50V R0926 0662057A65 4k7 1/16W 5%...
  • Page 148 Main Board - Control Head P 5-108 Schematic Diagrams and Parts Lists...
  • Page 149: Model Chart

    Table of Contents Chapter 6 216-246MHz Specific Information Table of Contents Chapter Model Chart and Technical Specifications Radio Tuning Procedure Theory of Operation PCB/Schematic Diagrams and Parts Lists 216-246MHz Specific Information...
  • Page 150 Table of Contents 6-ii 216-246MHz Specific Information...
  • Page 151 Table of Contents Chapter 6.1 Model Chart and Technical Specifications Table of Contents Paragraph Page Overview ..................... 1 Model Chart ....................1 Technical Specifications ................2 General ......................2 Transmitter....................2 Receiver....................... 3 Model Chart and Technical Specifications 6.1-i...
  • Page 152 Table of Contents 6.1-ii Model Chart and Technical Specifications...
  • Page 153: Overview

    Low Profile Trunnion Kit GMN6146_ Enhanced Compact Microphone PMUE1609A GM950i 245-246MHz 20/25kHz Tanapa PMUE1610A GM950i 220-240MHz 20/25kHz Tanapa PMUE1611A GM950i 245-246MHz 12.5kHz Tanapa PMUE1612A GM950i 216-223MHz 20/25kHz Tanapa GKN6270_ Power Cable 6804111J35 GM950E/GM950i User Guide Model Chart and Technical Specifications 6.1-1...
  • Page 154: Technical Specifications

    Technical Specification Technical Specification General SPECIFICATION ITEM TYPICAL VALUE Frequency Range 216-246 MHz Channel Spacing 12.5 or 20/25 kHz Frequency Stability ±3ppm Power Supply 10.8 to 15.6V dc, negative earth Dimensions 44x168x160 mm (HxWxD) Weight 1030g Operational Temperature - 25°C to + 55°C Storage Temperature - 40°C to + 85°C 50 Ω...
  • Page 155: Receiver

    Technical Specification Receiver SPECIFICATION ITEM TYPICAL VALUE Channel Spacing 12.5 or 20/25 kHz Sensitivity @ 12.5 kHz < 0.35uV (12dB SINAD) Sensitivity @ 25 kHz < 0.35uV (12dB SINAD) Intermodulation >65dB ETS; >70dB with Base Option Adjacent Channel Selectivity >60dB (12.5kHz); >70dB (20/25kHz) Spurious Rejection >70dB ETS Audio Distortion @ Rated Audio...
  • Page 156 Technical Specification 6.1-4 Model Chart and Technical Specifications...
  • Page 157 Table of Contents Chapter 6.2 Radio Tuning Procedure Table of Contents Paragraph Page 216-246 MHz Tuning Procedure ..............1 General ......................1 PA Bias Voltage................... 3 Battery Threshold ..................3 Transmitter Power ..................4 Reference Oscillator ..................4 Front-End Filter.................... 5 Rated Volume ....................
  • Page 158 Table of Contents 6.2-ii Radio Tuning Procedure...
  • Page 159: Mhz Tuning Procedure

    216-246MHz Tuning Procedure 216-246MHz Tuning Procedure General The recommended hardware platform is a 386 or 486 DX 33 PC (personal computer) with 8 MBytes RAM, MS-DOS™ 5.0, Windows™3.1, and RSS (Radio Service Software). These are required to align the radio. Refer to your RSS Installation Manual for installation and setup procedures for the required software;...
  • Page 160 216-246MHz Tuning Procedure CAUTION: DO NOT switch radios in the middle of any Service procedure. Always use the Program or Cancel key to close the tuning window before disconnecting the radio. Improper exits from the Service window may leave the radio in an improperly configured state and result in seriously degraded radio or system performance.
  • Page 161: Pa Bias Voltage

    216-246MHz Tuning Procedure PA Bias Voltage Adjustment of the PA Bias is critical for proper radio operation. Improper adjustment will result in poor operation and may damage the PA FET device. For this reason, the PA bias must be set before the transmitter is keyed the first time.
  • Page 162: Transmitter Power

    216-246MHz Tuning Procedure Transmitter Power The radio has two power level settings, a high power level setting, and a low power level setting. IMPORTANT: To set the transmitter power for customer applications use the Per Radio window under the Edit menu and set the “Power 1” and “Power 2” powers to the desired values.
  • Page 163: Front-End Filter

    216-246MHz Tuning Procedure Table 6.2-2 Reference Oscillator Alignment. RF-Band Target All bands ±150 Hz Front-End Filter Alignment of the front-end pre-selector is normally not required on these radios. Only if the radio has poor receiver sensitivity or the pre-selector parts have been replaced the following procedure should be performed.
  • Page 164: Rated Volume

    216-246MHz Tuning Procedure Rated Volume The rated volume softpot sets the maximum volume at normal test modulation. Set test box (GTF180) meter selection switch to the “AUDIO PA” position and the speaker load switch to the “MAXAR” position. Connect an AC voltmeter to the test box meter port. From the Service menu, select Rx Alignments.
  • Page 165: Transmit Deviation Limit

    216-246MHz Tuning Procedure Transmit Deviation Limit The transmit deviation limit softpot sets the maximum deviation of the carrier. The deviation limit needs to be set at 7 frequencies across the frequency range. Unlike other radios, the deviation limit for 216-246MHz is set using low frequency (PL) rather than the usual 1 kHz tone. No audio signal must be injected, the radio generates a 82.5 Hz tone while the deviation limit alignment window is open.
  • Page 166 216-246MHz Tuning Procedure Click the Toggle PTT button to key the radio. The status bar will indicate that the radio is transmitting. Measure the transmitter deviation. Adjust the transmitter deviation to the value shown in table 6.2-6. Click the Toggle PTT button to dekey the radio. 10.
  • Page 167 Table of Contents Chapter 6.3 Theory of Operation Table of Contents Paragraph Page Overview..................... 1 Controller....................2 General ......................2 Voltage Regulators ..................2 Electronic On/Off ..................3 Mechanical On/Off ..................3 Ignition ......................3 Hook ......................4 Microprocessor Clock Synthesizer .............. 4 Serial Peripheral Interface (SPI) ..............
  • Page 168: Paragraph Page

    Table of Contents Paragraph Page Transmit Signalling Circuits ..............10 Sub-audible Data (PL/DPL) ............... 10 High Speed Data and DTMF ..............11 Receive Audio Circuits................12 Squelch Detect ..................12 Audio Processing and Digital Volume Control ........... 13 Audio Amplification Speaker (+) Speaker (-) ..........13 Handset Audio ...................
  • Page 169: Overview

    Overview Overview This section provides a detailed theory of operation for the radio and its components. The main radio is designed to accept one additional option board. This may provide functions such as secure voice/or a signalling decoder. The control head is mounted directly on the front of the radio. The control head contains a speaker, LED indicators, a microphone connector, buttons and dependant of radio type, a display.
  • Page 170: Controller

    The digital section consists of a microprocessor, support memory, support logic, signal MUX ICs, the On/Off circuit, and general purpose Input/Output circuitry. The closed architecture controller uses the Motorola 68HC11E9 (U0101) for a GM950E radio and the 68HC11E20 for a GM950i radio. In this configuration RAM and ROM are contained within the microprocessor itself.
  • Page 171: Electronic On/Off

    Controller The voltage SW B+ is monitored by the µP through the voltage divider R0641/R0642. Diode VR0641 limits the divided voltage to 5.1V to protect the µP. Diode D5601 (UHF) / D3601 (VHF) located on the PA section acts as protection against transients and wrong polarity of the supply voltage.
  • Page 172: Hook

    Controller When the IGNITION input goes below 6 volts, Q0421 switches off and R0426, R0427 pull line IGNITION SENSE high. The software is alerted by line IGNITION SENSE to switch off the radio by setting B+ CONTROL to low. The next time the IGNITION input goes above 6 volts the above process will be repeated.
  • Page 173: Sbep Serial Interface

    Controller The timing and operation of this interface is specific to the option connected, but generally follows the pattern: 1) an option board device generates the interrupt, 2) main board asserts a chip select for that option board device, 3) the main board µP generates the CLK, and 4) when data transfer is complete the main board terminates the chip select and CLK activity.
  • Page 174: Control Head Model A2 Or A3

    Controller C0622 allows the battery voltage to be disconnected for a couple of seconds without losing RAM parameters. Diode D0621 prevents radio circuitry from discharging this capacitor. U0101-22 is the high reference voltage for the A/D ports on the E9/20µP. Resistor R0105 and capacitor C0105 filter the +5V reference.
  • Page 175: Controller Board Audio And Signalling Circuits

    The MIC signal is routed to the AFIC´s TX IN input (U0103-10) through R0146 and R0145 (GM950E radio) or through Op-amp buffer U0106-2 and option board connector J0103-3,1 (GM950i radio).
  • Page 176: External Mic Path

    PTT. The MIC signal is routed to the AFIC (U0103) through R0146 and R0145 (GM950E radio) or through Op-amp buffer U0106-2 and option board connector J0103-3,1 (GM950i radio). R0145, C0145, the amplifier inside the AFIC (pins 9,10) and gain setting resistor R0147 pre-emphasise the MIC audio...
  • Page 177 Transmit Audio Circuits Option Board Audio (GM950i only) The audio coming from the microphone (J0101-16) or the external microphone (J0400-2) is routed through Op-amp buffer U0106-2 (GM950i only) to the option board connector J0103-3. After option board processing the signal emerges at J0103-1. The source resistor of the option board output and C0145, the amplifier inside the AFIC (U0103-9,10) and gain setting resistor R0147 pre-emphasise the signal.
  • Page 178: Transmit Signalling Circuits

    Transmit Signalling Circuits Transmit Signalling Circuits Refer to Figure 6.3-2 for reference for the following sections. From a hardware point of view, there are three types of signalling: Sub-audible data (PL / DPL / Connect Tone) that gets summed with transmit voice or signal- ling, DTMF data for telephone communication in trunked and conventional systems, and Audible signalling including Select 5, MPT-1327, MDC, Single Tones.
  • Page 179: High Speed Data And Dtmf

    Transmit Signalling Circuits High Speed Data and DTMF The High Speed Data and DTMF waveforms are created by the µP U0101 using summer U0105-3. Op-amp U0105-3 and resistors R0121-R0124 add up the three signals coming from the µP pins 58, 59 and 62.
  • Page 180: Receive Audio Circuits

    Receive Audio Circuits Receive Audio Circuits Refer to Figure 6.3-3 for reference for the following sections. ACCESSORY CONNECTOR FLT RX AUDIO J0400 AUDIO SPKR + EXTERNAL SPKR - U0401 SPEAKER SPKR- SPKR+ CONTROL HEAD CONNECTOR ATTEN. INTERNAL SPEAKER J0101 HANDSET AUDIO RX AUD OUT UNAT...
  • Page 181: Audio Processing And Digital Volume Control

    Receive Audio Circuits Audio Processing and Digital Volume Control The receiver audio signal enters the controller section from the IF IC (U5201-28) on DET AUDIO. The signal is AC coupled by C0181 and enters the AFIC via the RX IN pin U0103-7. Inside the AFIC the signal entering RX IN (U0103-7) goes through the audio path while the signal entering PL DPL IN (U0103-8) via C0182 goes through the PL/DPL path.
  • Page 182: Handset Audio

    Receive Audio Circuits The SPK+ and SPK- outputs of the audio PA have a DC bias which varies proportionately with FLT A+ (U0401-7). FLT A+ of 11V yields DC offset of 5V, and FLT A+ of 17V yields a DC offset of 8.5V. If either of these lines is shorted to ground, it is possible that the audio PA will be damaged.
  • Page 183: Receive Signalling Circuits

    Receive Signalling Circuits Receive Signalling Circuits Refer to Figure 6.3-4 for reference for the following sections. HIGH SPEED DATA CENTRE SLICER U0105-2 UNATTEN RX OUT PL CLOCK STROBE MICRO AFIC CONTROLLER U0103 U0101 PL DPL DET AUDIO LIMITER FILTER DECODER DISCRIMINATOR AUDIO GEPD_5430 FROM RF SECTION...
  • Page 184: Alert Tone Circuits

    Receive Signalling Circuits Alert Tone Circuits When the software determines that it needs to give the operator an audible feedback (for a good key press, or for a bad key press), or radio status , it sends an alert tone to the speaker. It does so by sending SPI BUS data to U0103 which sets up the audio path to the speaker for alert tones.
  • Page 185: 216-246Mhz Specific Circuit Description

    Receiver Front-End 216-246MHz SPECIFIC CIRCUIT DESCRIPTION Receiver Front-End The receiver is able to cover the range from 216 to 246 MHz. It consists of four major blocks: front- end, mixer, first IF section and IF IC. Antenna signal pre-selection is performed by two varactor tuned bandpass filters.
  • Page 186: If Ic (U5201)

    Transmitter Power Amplifier (PA) 5-25W The IF amplifier Q5201 is actively biased by a collector base feedback (R5201, R5202) to a current drain of approximately 5 mA drawn from the voltage 5V STAB. The output impedance is matched to the second two pole crystal filter Y5202. A dual hot carrier diode (D5201) limits the filter output voltage swing to reduce overdrive effects at RF input levels above -27 dBm.
  • Page 187: Pa Stages

    Transmitter Power Amplifier (PA) 5-25W The collector current of Q8510 causes a voltage drop across the resistors R8623 and R8624. Transistor Q8612 adjusts the voltage drop across R8621 through PA control line (PWR CNTL). The current source Q8621 adjusts the collector current of Q8510 by modifying its base voltage until the voltage drop across R8623 and R8624 plus VBE (0.6V) equals the voltage drop across R8621 plus VBE (0.6V) of Q8611.
  • Page 188: Harmonic Filter

    Transmitter Power Amplifier (PA) 5-25W In transmit mode, this K9V1 voltage is high and biases Q8520 and, along with the RF signal from Q8510, allows a collector current to be drawn. The collector current of Q8520 drawn from A+ flows via L8542, L8541, directional coupler, D8551, L8551, D8631, L8631, R8616, R8617 and L8611 and switches the PIN diodes D8551 and D8631 to the low impedance state.
  • Page 189 Transmitter Power Amplifier (PA) 5-25W Op-amp U0701-2 and resistors R0701 to R0703 and R0731 subtract the negative PWR DETECT voltage from the PA PWR SET D/A output U0731 pin 2. The result is connected to Op-amp inverting input U0701-4 pin 9 which is compared with a 4.6 volt reference VAG present at noninverting input U0701-4 pin 10 and controls the output power of the PA via pin 8 and control line PWR CNTL.
  • Page 190: Frequency Synthesis

    Frequency Synthesis 10.0 Frequency Synthesis The complete synthesizer subsystem consists of the Reference Oscillator (Y3702 or Y3701), the Fractional-N synthesizer (U3701), the Voltage Controlled Oscillator (Q3741, Q3751), the RX and TX buffer stages (Q3760, Q3770, Q3780) and the feedback amplifier (Q3790). 10.1 Reference Oscillator The Reference Oscillator (Y3702) contains a temperature compensated crystal oscillator with a...
  • Page 191: Synthesizer Operation

    Frequency Synthesis Diode D3754 controls the amplitude of the oscillator. The frequency of the transmit oscillator is mainly determined by L3734, C3736 - C3740 and varactor diodes D3732 / D3733. Diode D3739 controls the amplitude of the oscillator. With a steering voltage from 3V to 10V at the varactor diodes the RX frequency range from 181.1 MHz to 219.1 MHz and the TX frequency range from 136 MHz to 174 MHz are covered.
  • Page 192 Frequency Synthesis The balance attenuator is used to adjust the VCO’s deviation sensitivity to high frequency modulating signals. The output of the balance attenuator is present at the MODOUT port (U3701- 28) and connected to the VCO modulation diode D3731. 6.3-24 Theory of Operation...
  • Page 193 Table of Contents Chapter 6.4 PCB/Schematic Diagrams and Parts Lists Table of Contents Description Page 216-246MHz Diagrams and Parts Lists PCB Layout Component Side ..........1 PCB Layout Solder Side .
  • Page 194 Table of Contents 6.4-ii PCB/Schematic Diagrams and Parts Lists...
  • Page 195 216-246MHz Main Board Component Side C104 J101 C5238 C5229 L114 C105 E3701 Y114 R3703 C3726 R3724 R5222 C116 C117 Q114 C137 R160 R3723 C115 C110 R104 C3727 C5226 R102 R3705 C114 R126 R103 Y3702 C118 R116 R5221 C3702 R3702 C194 Q138 R119 U3801...
  • Page 196 216-246MHz Main Board Solder Side C472 C444 C442 C436 C451 R444 C421 VR419 C454 VR444 VR441 R451 D8601 C8522 R456 R450 R455 C8525 L8533 C450 C8601 C8527 R441 R443 C8523 C8604 Q442 Q411 C411 Q482 R411 R477 R442 R414 R412 R8617 C414 R474...
  • Page 197 216-246MHz 80ch Closed Controller Schematic Diagram J0102 MIC_PTT +5V +5V R117 SPI_MISO R116 R118 J0102_3 (GP6) 4.7K R113 SPI_MOSI C118 C119 OPTION_BD_CE 470pF 470pF L170 VR118 C164 SPI_CLCK_SRC 33uH 4700pF R164 C170 J0102_7 (GP4) +2V5 R167 R114 R161 4.7K L114 100K 33uH C162...
  • Page 198 216-246MHz 80ch Closed Controller Schematic Diagram Controller Controller_IO Circuit Motorola Circuit Motorola Description Description Parts List Parts List Part No. Part No. C0151 2113741F17 470pF 50V C0464 2113741F17 470pF 50V Circuit Motorola Circuit Motorola Description Description Part No. Part No.
  • Page 199 216-246MHz 80ch Closed Controller_IO Schematic Diagram (GP3) R431 R432 4.7K R413 R412 R461 R462 4.7K 4.7K (GP5) (GP3) Q431 Q461 Q412 C461 C413 .01uF .01uF R414 C431 R463 VR431 470pF VR464 C464 C412 VR411 470pF 470pF R465 R411 R464 FLT_A+ Q411 (GP3) C411...
  • Page 200 216-246MHz 80ch Closed Controller_IO Schematic Diagram Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. R0103 0662057A73 10k 1/16W 5% R0142 0662057A49 1k 1/16W 5% R0405 0662057A73 10k 1/16W 5%...
  • Page 201 216-246MHz Supply Voltage Schematic Diagram FLT_A+ USW_+5V R621 FLT_A+_8 USW_+5V_CL 2.2K FLT_A+ D621 C621 C622 470pF 47uF VR621 R606 U601 9V3_1_8 9V3_8 VOUT R631 D631 R601 ON_OFF C604 C605 R602 U631 C603 7.5K 33uF 0.1uF 10uF C601 C602 INPUT OUTPUT 470pF 0.1uF FEEDBACK...
  • Page 202 216-246MHz Supply Voltage Schematic Diagram Supply Voltage Circuit Motorola Description Parts List Part No. R0614 0662057A49 1k 1/16W 5% Circuit Motorola Description Part No. R0615 0662057A73 10k 1/16W 5% R0616 0662057A73 10k 1/16W 5% C0601 2113741F17 470pF 50V C0602 2113741B69 0.1uF...
  • Page 203 216-246MHz Power Control Schematic Diagram VAG_7 (CNTL) VAG C711 R712 .039uF C705 R705 R702 4700pF PWR_DETECT_7 R704 U701-3 (PA) PWR_DETECT PWR_CNTL_7 R701 R711 PWR_CNTL (PA) C701 C702 100pF 100pF U701-2 C713 100pF C712 PA_PWR_SET 43pF R716 R717 U701-4 560K R703 R714 C716 Q711...
  • Page 204 216-246MHz Power Control Schematic Diagram Power Control Circuit Motorola Description Parts List Part No. R0713 0662057A61 3k3 1/16W 5% Circuit Motorola Description Part No. R0714 0662057A75 12k 1/16W C0701 2113740F51 100pF 5% 50V R0715 0662057A81 22k 1/16W 5% C0702 2113740F51...
  • Page 205 216-246MHz Power Amplifier 5-25W Schematic Diagram 120pF 62pF 39nF 36pF 30pF 62pF 20pF 12pF 38.13nH 38.13nH 15pF 20pF 22pF 38.13nH GM950EI001-O 216-246MHz Power Amplifier 5-25W Schematic Diagram Diagrams and Parts Lists 6.4-11...
  • Page 206 216-246MHz Power Amplifier 5-25W Schematic Diagram Power Amplifier 5-25W Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Parts List Part No. Part No. Part No. C8554 2111078B18 HQ 15pF 5% L8534 2484657R01 Ferrite Bead R8541 0680194M01 10 1W 5%...
  • Page 207 216-246MHz Synthesizer Schematic Diagram 5.6K GM950EI003-A 216-246MHz Synthesizer Schematic Diagram Diagrams and Parts Lists 6.4-13...
  • Page 208 216-246MHz Synthesizer Schematic Diagram Synthesizer Circuit Motorola Description Parts List Part No. R3705 0662057A73 10k 1/16W 5% (12.5kHz) Circuit Motorola Description 0662057A89 47k 1/16W 5% (20/25kHz) Part No. R3708 0662057B47 0 1/16W C3701 2113740F51 100pF 5% 50V R3709 0662057A01 10 1/16W 5%...
  • Page 209 216-246MHz Voltage Controlled Oscillator Schematic Diagram L3742 9V3_1_4 9V3_4 C3734 R3731 C3733 R3740 8.2pF L3731 C3731 .001uF C3743 R3742 C3744 68nH K9V1_4 0.1uF .001uF K9V1 5V_STAB D3731 C3736 18pF C3780 .001uF C3771 C3737 C3738 R3763 R3781 36pF U3741 0.1uF D3732 C3781 R3771 C3763...
  • Page 210 216-246MHz Voltage Controlled Oscillator Schematic Diagram Voltage Controlled Oscillator Circuit Motorola Circuit Motorola Parts List Description Description Part No. Part No. C3777 2113741F17 470pF 50V L3761 2462587T13 COIL CHIP 68nH Circuit Motorola Description Part No. C3780 2113741F25 1nF 50V L3768...
  • Page 211 216-246MHz RX-FE Schematic Diagram 3.9pF 1.5K 1.5K R3340 R3341 C3352 C3353 C3354 C3351 11pF 11pF 11pF 11pF 11pF D3311 D3312 C3355 D3313 D3314 11pF 33pF 43pF 33pF 39pF 10nH 8.2nH GM950EI004-A 216-246MHz RX-FE Schematic Diagram Diagrams and Parts Lists 6.4-17...
  • Page 212 216-246MHz RX-FE Schematic Diagram RX-FE Circuit Motorola Circuit Motorola Description Description Parts List Part No. Part No. D3303 4880154K03 Dual Schottky SOT23 T3301 2505515V03 XFMR JEDI MIXER SMD 4:1 Circuit Motorola Description Part No. D3311 4802245J22 VCTR IT363 T3302 2505515V03...
  • Page 213 216-246MHz RX-IF Schematic Diagram 216-246MHz RX-IF Schematic Diagram Diagrams and Parts Lists 6.4-19...
  • Page 214 216-246MHz RX-IF Schematic Diagram RX-IF Circuit Motorola Description Parts List Part No. D5201 4880154K03 Dual Schottky SOT23 Circuit Motorola Description Part No. FL5201 9180098D04 Filter CER 4-EL 455kHz FL5202 9180097D04 Filter CER 6-EL 455kHz C5200 2113740F35 22pF 5% 50V C5201 2113740F19 4.7pF 5% 50V...
  • Page 215 Table of Contents Appendix A PL/DPL Codes Table of Contents Paragraph Page PL Codes and Digital PL (DPL) Codes ......1 Self-Quieting Frequencies .
  • Page 216 Table of Contents A-ii PL (CTCSS) Codes...
  • Page 217 PL Codes and Digital PL (DPL) Codes PL Codes and Digital PL (DPL) Codes The following PL Codes have been tested and are acceptable for programming into any transmit or receive frequency. GROUP A GROUP B GROUP C Code Freq Code Freq Code...
  • Page 218 Self-Quieting Frequencies PL (CTCSS) Codes...
  • Page 219 Table of Contents Appendix B External Device Connectors Table of Contents Paragraph Page Accessory Connector Details ........1 Microphone Connector .
  • Page 220 Table of Contents B-ii External Device Connectors...
  • Page 221 Accessory Connector Details Accessory Connector Details The 16-pin accessory connector pin functions are as follows: Name Type 4-Channel 128-Channel SPKR- Analogue output Ext. Mic Audio Analogue input Digital input Digital output Flat TX Audio Analogue input BUS+ Digital i/o Ground Digital i/o Digital ip.
  • Page 222 Accessory Connector Details Pin 6. - BUS+ This connects to the radioÕs SCI serial bus which is used for programming and tuning the radio. The line is also available at the microphone connector Pin 7. Pin 7. - Ground Used as ground for both analogue and digital signals. Pin 8.
  • Page 223: Microphone Connector

    Microphone Connector Microphone Connector The radio is Þtted with an 8-pin ÔTelcoÕ connector which is connected as follows: Name Type Connected To Mic. Hook Digital input Port A7 Ground Mic. Audio Analogue input AFIC TX IN Mic. PTT Digital i/o Port C4 BUS+ Digital i/o...
  • Page 224 Microphone Connector External Device Connectors...
  • Page 225 Table of Contents Appendix C Radio Conversion Table of Contents Paragraph Page How to alter the radio for Base Station Operation ....1 Radio Conversion...
  • Page 226 Table of Contents C-ii Radio Conversion...
  • Page 227 How to alter the radio for Base Station Operation How to alter the radio for Base Station Operation UHF Radio Conversion If the UHF radio is conÞgured for a base station application, R5319 is not placed and TP5301 and TP5302 are shorted. VHF Radio Conversion If the VHF radio is conÞgured for a base station application, R3318 is not placed and TP3301 and TP3302 are shorted.
  • Page 228 How to alter the radio for Base Station Operation Radio Conversion...

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