Motorola Gm328 Gm338 Gm398 Detailed 6804112j18 E Manual
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UHF Band 2 25-40W PCB / Schematics / Parts List4-13 * Motorola Depot Servicing only Reference designators with an asterisk indicate components which are not field replaceable because they need to be calibrated with specialized factory equipment after installation. Radios in which these parts have been replaced in the field will be off frequency at temperature extremes. R3151 0662057A73 10K R3152 0662057A73 10K R3153 0662057A73 10K R3154 0662057A73 10K R5001 0662057A97 97K R5002 0662057A37 330 R5003 0662057A65 4.7K R5004 0662057A59 2.7K R5005 0662057A73 10K R5007 0662057A21 68 R5012 0662057A97 97K R5016 0662057A61 3.3K R5018 0662057A61 3.3K R5020 0662057A01 10 R5021 0662057A01 10 R5022 0662057B47 0 R5051 0662057A18 51 R5052 0662057B47 0 R5060 0662057B10 330K R5064 0662057B47 0 R5068 0662057A53 1.5K R5069 0662057A49 1K R5201 0662057A29 150 R5203 0662057A17 47 R5204 0662057A17 47 R5211 0662057B47 0 R5221 0662057A29 150 R5222 0662057A42 510 R5223 0662057A21 68 R5228 0662057A89 47K R5241 0662057A33 220 R5251 0662057A87 39K R5252 0662057A84 30K R5261 0662057A89 47K R5263 0662057A25 100 R5301 0662057A67 5.6K R5302 0662057A73 10K R5303 0662057A12 30 R5304 0662057A29 150 R5305 0662057A01 10 R5311 0662057A70 7.5K R5312 0662057A70 7.5K R5313 0662057A12 30 R5314 0662057A33 220 R5315 0662057B47 0 R5321 0662057A91 56K R5322 0662057A69 6.8K R5331 0662057A09 22 R5341 0662057B47 0 R5342 0662057A57 2.2K R5343 0662057A49 1K Circuit RefMotorola Part No.Description R5344 0662057A01 10R5346 0662057A73 10K R5347 0662057B47 0 R5361 0662057A31 180 R5401 0662057A36 300 R5402 0662057A05 15 R5403 0662057A36 300 R5405 0662057A32 200 R5408 0662057B05 200K R5409 0662057A97 97K R5412 0662057A67 5.6K R5415 0662057A25 100 R5416 0662057A25 100 R5421 0680194M01 10 R5422 0611079A69 620 R5423 0611079A69 620 R5424 0611079A69 620 R5425 0611079A69 620 R5427 0662057A73 10K R5428 0662057A65 4.7K R5457 0683962T51 120 R5473 0662057A64 4.3K R5474 0662057A97 97K R5475 0662057B47 0 R5480 0662057A97 97K R5482 0662057B09 300K R5483 0662057A97 97K R5484 0662057A93 68K R5485 0662057C53 120 R5486 0662057C53 120 R5487 0662057A97 97K R5488 0662057A59 2.7K R5491 0662057A74 11K R5492 0662057A73 10K R5495 0680195M18 51 R5496 0680194M23 82 R5497 0680195M18 51 R5501 0662057A67 5.6K R5502 0662057A93 68K R5503 0662057A63 3.9K R5504 0662057A73 10K R5506 0662057A73 10K R5507 0662057A73 10K R5511 0680194M18 51 R5512 0662057A41 470 R5513 0662057A73 10K R5514 0662057A61 3.3K R5600 0662057C19 4.7 R5601 0662057C19 4.7 R5602 0662057C19 4.7 R5631 0662057A49 1K Circuit RefMotorola Part No.Description R5632 0662057A82 24K SH5301 2602641Y02 SHIELD SH5302 2602641Y02 SHIELD T5051 2505515V03 TRANSFORMER 4:1 T5052 2508397X02 TRANSFORMER 1:1 U0101 5102226J56 MICROPROCESSOR U 0 111 5102463J64 EEPROM U0121 5186137B01 IC, FLASH ROM U0122 5185748L01 SRAM U0141 5113805A30 REMUX U0211 5183222M49 IC, QUAD OPAMP U0221 5185130C53 IC, ASFIC U0251 5184704M60 IC-CMOS ANALOG U0271 5109699X01 AUDIO PA U0301 5109152M01 EEPROM ANALOG U0331 5186204B01 BUFFER / DRIVER U0341 5113818A01 LINEAR IC OP AMP U0342 5105750U28 IC CMOS SWITCH U0351 5102463J40 REGULATOR, 3.3V U0611 5183308X01 ADJUSTABLE VOLTAGE REGULATOR U0641 5183308X01 ADJUSTABLE VOLTAGE REGULATOR U0651 5113816A07 REGULATOR, 5V U0652 5113815A02 UNDERVOLT SENSOR U3101 5186144B01 IC, IF U 3 111 5102463J52 QUAD ANALOG SWITCH U3115 5102463J52 QUAD ANALOG SWITCH U5201 5185963A27 IC FRACTN U5211 5185963A33 IC, VOLTAGE REGULATOR U5301 5105750U54 IC, VCO U5401 5185130C65 IC LDMOS DRIVER U5501 5185765B26 IC POWER CONTROL U5502 5185963A15 IC TEMPERATURE SENSOR VR0151 4813830A15 DIODE, 5.6V VR0501 4805656W09 DIODE, ZENER VR0503 4805656W09 DIODE, ZENER VR0504 4813830A40 DIODE, ZENER VR0505 4805656W09 DIODE, ZENER VR0509 4813830A40 DIODE, ZENER VR0510 4813830A40 DIODE, ZENER VR0537 4813830A15 DIODE, 5.6V VR0541 4813830A27 DIODE, 14V VR0601 4813832C77 DIODE VR0621 4813830A15 DIODE, 5.6V VR5471 4813830A15 DIODE, 5.6V Y0131 4880113R19 CRYSTAL 38.4KHZ Y3101 4880606B09 2ND OSC XTAL 44.395 MHZ Y3102 9186145B02 455KHz DISCRIMINATOR Y5262 4886182B01 TCXO 16.8MHZ Circuit RefMotorola Part No.Description
4-14UHF Band 2 25-40W PCB / Schematics / Parts List THIS PAGE INTENTIONALLY LEFT BLANK
GM338 Mobile Radio UHF B1 HIGH POWER LDMOS (403-470MHz) Service Information Issue: December, 2003
Computer Software Copyrights The Motorola products described in this manual may include copyrighted Motorola computer programs stored in semiconductor memories or other media. Laws in the United States and other countries preserve for Motorola certain exclusive rights for copyrighted computer programs, including the exclusive right to copy or reproduce in any form, the copyrighted computer program. Accordingly, any copyrighted Motorola computer programs contained in the Motorola products described in this manual may not be copied or reproduced in any manner without the express written permission of Motorola. Furthermore, the purchase of Motorola products shall not be deemed to grant, either directly or by implication, estoppel or otherwise, any license under the copyrights, patents or patent applications of Motorola, except for the normal non-exclusive royalty- free license to use that arises by operation of law in the sale of a product.
i Table of Contents Section 1 Model Chart and Technical Specifications 1.0 GM338 Model Chart............................................................................................. 1-1 2.0 Technical Specifications ...................................................................................... 1-1 Section 2 Theory of Operation 1.0 Introduction .......................................................................................................... 2-1 2.0 UHF (403-470 MHz) Receiver ............................................................................. 2-1 2.1 Receiver Front-End ........................................................................................ 2-1 2.2 Front-End Band-Pass Filters & Pre-Amplifier ................................................. 2-2 2.3 First Mixer and High Intermediate Frequency (IF) .......................................... 2-2 2.4 Low Intermediate Frequency (IF) and Receiver Back End ............................. 2-3 3.0 UHF (403-470 MHz) Transmitter Power Amplifier (PA) 40 W.............................. 2-3 3.1 First Power Controlled Stage.......................................................................... 2-4 3.2 Power Controlled Driver Stage ....................................................................... 2-4 3.3 Final Stage ..................................................................................................... 2-4 3.4 Directional Coupler ......................................................................................... 2-5 3.5 Antenna Switch............................................................................................... 2-5 3.6 Harmonic Filter ............................................................................................... 2-5 3.7 Power Control ................................................................................................. 2-5 4.0 UHF (403-470 MHz) Frequency Synthesis .......................................................... 2-6 4.1 Reference Oscillator ....................................................................................... 2-6 4.2 Fractional-N Synthesizer ................................................................................ 2-7 4.3 Voltage Controlled Oscillator (VCO) ............................................................... 2-8 4.4 Synthesizer Operation .................................................................................... 2-9 Section 3 Troubleshooting Charts 1.0 Troubleshooting Flow Chart for Receiver ............................................................ 3-1 2.0 Troubleshooting Flow Chart for 40W Transmitter ................................................ 3-3 3.0 Troubleshooting Flow Chart for Synthesizer ........................................................ 3-5 4.0 Troubleshooting Flow Chart for VCO ................................................................... 3-6
ii Section 4 UHF PCB/Schematics/Parts Lists 1.0 Allocation of Schematics and Circuit Boards ....................................................... 4-1 1.1 Controller Circuits ........................................................................................... 4-1 2.0 UHF 25-40W PCB / Schematics / Parts List ........................................................ 4-3 UHF (403-470 MHz) 25-40W 8486127Z01 Top Side ............................................. 4-3 UHF (403-470 MHz) 25-40W 8486127Z01 Bottom Side ....................................... 4-4 UHF (403-470 MHz) Power Amplifier 25-40W ....................................................... 4-5 UHF (403-470 MHz) FRACN .................................................................................. 4-6 UHF (403-470 MHz) Voltage Controlled Oscillator................................................. 4-7 UHF (403-470 MHz) Receiver Front End ............................................................... 4-8 UHF (403-470 MHz) IF ........................................................................................... 4-9 UHF PCB 8486127Z01 Parts List 25-40W ........................................................... 4-10
1-1 Section 1 MODEL CHART AND TECHNICAL SPECIFICATIONS 1.0 GM338 Model Chart 2.0 Technical Specifications Data is specified for +25°C unless otherwise stated. GM Series, UHF Band 1, 403-470 MHz Mode Description AZM25RKF9AA5GM338 403-470 MHz 25-40W Conv Pref (LDMOS) Item Description X GCN6114_ GM338 Control Head Direct Mount XIMUE6012_Tanapa WM 403-470 MHz 25-40W X RAE4151_ BNC 403-430 MHz, 1/4 Wave Roof Mount XRAE4152_BNC 450-470 MHz, 1/4 Wave Roof Mount X RAE4153_ BNC 450-470 MHz, 3.5dB Gain Roof Mount XRAE4154_BNC 450-470 MHz, 5dB Gain Roof Mount X RAE4158_ BNC 406-420 MHz, 3.5dB Gain Roof Mount X6804112J06GM338 User Guide x = Indicates one of each is required. General Specifications Channel Capacity GM338 128 Power Supply 13.2Vdc (10.8 - 15.6Vdc) Dimensions: H x W x D (mm) Depth excluding knobsGM338 59mm x 179mm x 198mm (25 - 45W) (add 9mm for Volume Knob) Weight GM338 1400 g Sealing:Withstands rain testing per MIL STD 810 C/D/E and IP54 Shock and Vibration: Protection provided via impact resistant housing exceeding MIL STD 810-C/D/E Dust, Salt & Fog:Protection provided via environment resistant housing exceeding MIL STD 810 C/D/E
1-2Technical Specifications *Availability subject to the laws and regulations of individual countries.Transmitter UHF *Frequencies - Full BandsplitUHF 403-470 MHz Channel Spacing12.5/20/25 kHz Frequency Stability (-30°C to +60°C, +25° Ref.)±2.0 ppm Power 25-40W Modulation Limiting ±2.5 @ 12.5 kHz ±4.0 @ 20 kHz ±5.0 @ 25 kHz FM Hum & Noise-40 dB @ 12.5kHz -45 dB @ 20/25kHz Conducted/Radiated Emission (ETS)-36 dBm 1 GHz Adjacent Channel Power-60 dB @ 12.5 kHz -70 dB @ 25 kHz Audio Response (300 - 3000 Hz)+1 to -3 dB Audio Distortion @1000Hz, 60% Rated Maximum Deviation 65 dB Adjacent Channel Selectivity (ETS) 65 dB @ 12.5 kHz 70 dB @ 20 kHz 75 dB @ 25 kHz Spurious Rejection (ETS)70 dB @ 12.5 kHz 75 dB @ 20/25 kHz Rated Audio 3W Internal 7.5W External 13W External Audio Distortion @ Rated Audio
2-1 Section 2 THEORY OF OPERATION 1.0 Introduction This Chapter provides a detailed theory of operation for the UHF circuits in the radio. For details of the theory of operation and troubleshooting for the the associated Controller circuits refer to the Controller Section of this manual. 2.0 UHF (403-470 MHz) Receiver 2.1 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 bandpass filters and pre-amplifier, first mixer, high-IF, low-IF and receiver back-end . Two varactor-tuned bandpass filters perform antenna signal pre-selection. A cross over quad diode mixer converts the signal to the first IF of 44.85 MHz. Low-side first injection is used. Figure 2-1 UHF Receiver Block Diagram Demodulator 1. Crystal Filter Mixer Va r a c t o r Tuned Filter RF Amp Va r a c t o r Tuned Filter Pin Diode Antenna Switch RF Jack Antenna Control Voltage from PCICFirst LO from FGU Recovered Audio RSSI Second LO 2. Crystal Filter 455kHz Filter (25kHz)455kHz Filter (25kHz) 455kHz Filter (12.5kHz)455kHz Filter (12.5kHz)SwitchSwitchSwitchSwitch Limiter 1. IF Amp 2. IF Amp Filter Bank Selection from Synthesizer IC Harmonic Filter BWSELECT
2-2UHF (403-470 MHz) Receiver There are two 2-pole 44.85 MHz crystal filters in the high-IF section and 2 pairs of 455 kHz ceramic filters in the low-IF section to provide the required adjacent channel selectivity .The correct pair of ceramic filters for 12.5 or 25KHz channel spacing is selected via control line BWSELECT. The second IF at 455 kHz is mixed, amplified and demodulated in the IF IC. The processing of the demodulated audio signal is performed by an audio processing IC located in the controller section. 2.2 Front-End Band-Pass Filters & Pre-Amplifier The received signal from the radio’s antenna connector is first routed through the harmonic filter and antenna switch, which are part of the RF power amplifier circuitry, before being applied to the receiver pre-selector filter (C4001, C4002, D4001 and associated components). The 2-pole pre- selector filter tuned by the varactor diodes D4001 and D4002 pre-selects the incoming signal (RXIN) from the antenna switch to reduce spurious effects to following stages. The tuning voltage (FECTRL_1) ranging from 2 volts to 8 volts is controlled by pin 20 of PCIC (U4501) in the Transmitter section. A dual hot carrier diode (D4003) limits any inband signal to 0 dBm to prevent damage to the pre-amplifier. The RF pre-amplifier is an SMD device (Q4003) with collector base feedback to stabilize gain, impedance, and intermodulation. The collector current of approximately 11-16 mA is drawn from the voltage 9V3 via L4003 and R4002. A switchable 3dB pad (R4066,R4007,R4063, R4064 and R4070), controlled via line FECTRL_2 and Q4004 stabilizes the output impedance and intermodulation performance. A second 2-pole varactor tuned bandpass filter provides additional filtering of the amplified signal. The varactor diodes D4004 and D4005 are controlled by the same signal FECTRL_1, which controls the pre-selector filter. A following 1 dB pad (R4013 - R4015) stabilizes the output impedance and intermodulation performance. 2.3 First Mixer and High Intermediate Frequency (IF) The signal coming from the front-end is converted to the first IF (44.85 MHz) using a cross over quad diode mixer (D4051). Its ports are matched for incoming RF signal conversion to the 44.85 MHz IF using low side injection via matching transformers T4051 and T4052. The injection signal (RXINJ) coming from the RX VCO buffer (Q4332) is filtered by the lowpass filter consisting of (L4053, L4054, C4053 - C4055) followed by a matching transformer T4052 and has a level of approximately 15dBm. The mixer IF output signal (IF) from transformer T4501pin 2 is fed to the first two pole crystal filter FL3101. The filter output in turn is matched to the following IF amplifier. The IF amplifier Q3101 is actively biased by a collector base feedback (R3101, R3106) to a current drain of approximately 5 mA drawn from the voltage 5V. Its output impedance is matched to the second two pole crystal filter FL3102. The signal is further amplified by a preamplifier (Q3102) before going into pin 1 of IFIC (U3101). A dual hot carrier diode (D3101) limits the filter output voltage swing to reduce overdrive effects at RF input levels above -27 dBm.