Motorola Gm Series Detailed 6864115b62 B Manual

							UHF 25-40W Band1 PCB 8486127z01 / Schematics4-39
9
G
G GG G
G 4802245J84
NOTPLACED 2113740L30  33pF
L31249180469V03
0.75VDC
0.75VDC3VDC
NOTPLACED
2113740F35  22pF Y3101 4880606B09
20/25kHz  5VDC 12.5kHz  0VDC
3.9VDC
fundamental xtal 3rd overtone xtal
R3123 0662057B47  0 NOTPLACED
R3124 NOTPLACED 0662057A49 1K
C3124
2462587N68  1uH
C3136 2113740L29 30pF9180469V04
9180468v04
9180469V06
9180468V06
3VDC
0.1uF C3139 VDD14
VSS
7
Q3141
MC74HC4066U3111-1
CNTL131 2
R3116
330
82pF C3112
10 R3112
1.8K R3142R3154
10K
C3110
27pF
0.1uF C3142
15K R31320.1uFC3144
120pFC3143 390
GND2 2
GND3 4
5
GND4
3
IN6
OUTR3115
FL310112R161
GND1
R3117
27K
IF
Q3102
IFIN_VHF_IF_1R3104
NU C3113
9.1pF NU 100
620nHL311114
VDD
7 VSS
620 R3108
U3115-2
5CNTL4 3
6.8K R3107
R3135
1.2KBWSELECT_VHF_IF_1
C3103
33pF
C3132
0.1uF10K R3152
Q3152
C3152
.01uF R3118
6.8K
R3111
12K 5V_VHF_IF_1
Q3151
680 R314610K R3151 VSS
7
C3140
0.1uF MC74HC4066
U3111-4
CNTL1211 10VDD 14
C3101
3
GND1
GND2
41
IN2
OUT
NU 2.2pF
FL3111
CFWC455G
C3141
0.1uF
R3133
8.2K R3106
4700pF C3146R3141 27K
390 VDD
7 VSS
2.4K R3144
U3111-2MC74HC4066
5CNTL4 314
1pF C3131 C3122
.039uF
NU R3102
10 9V3_VHF_IF_2
FL3113
CFUCJ455F
3
GND
1
IN2
OUT
CNTL
131 2VDD14
VSS
7
DISCAUDIO_VHF_IF_1 MC74HC4066
U3115-1
12KR3101
R3147
12K C3133
10uF R3105
22pF C3115
L3100100
0.1uF 9V3
NU 620nHC3137
.039uF
C3134455KHz
3BWSELECT
45B02
Y3102
5V
D3101
0.1uF C3111
MC74HC4066
6CNTL14
VDD
7 VSS
GND3
GND4 5
IN 3
OUT6
U3115-3
12R16FL3102GND1 1
2
GND2
4
DISCAUDIO C3100
1000pF3.3K R3145
C3147
0.1uF 0.1uF C3145
620nH L3101C3123
RSSI_VHF_IF_1 C3151
.039uF.01uF
2GND 4GND1
3
OUT1
INR3130
51
44.395MHz45J84
Y3101
33pF
C313614
VDD
7 VSS
C3135
RSSI
U3111-3MC74HC4066
6CNTL
FL3114
CFUCJ455D
3
GND
1
IN2
OUT
0.1uF C3116CNTL
1211 10VDD 14
VSS
7
0.1uFMC74HC4066
U3115-4
C3121
Q3101
2
RFIN_DEC
5
RSSIOUT9
RSSI_FEED
6
VCC 330 R3113
11
LIMOUT
13
LIM_DEC1
12
LIM_DEC2 20
MIXOUT
4
OSCIN 3
OSCOUT
10
QUADIN1
RFIN
8
AUDIOOUT7
AUDIO_FEED
GND15
18
IFAMPIN 16
IFAMPOUT
19
IFAMP_DEC1 17
IFAMP_DEC214
LIMIN
SA616U3101
C3104
0.1uF10KR3153
620nH 9V3_VHF_IF_1
L3112
R3123
L3124 C3124
*R3124 C3114
18pF220pF C3148
4
1
IN2
OUT
NU
FL3112
CFWC455D
3
GND1
GND2
NU R3114
100OUT2
R3134
10KCFWC455F FL3115
GND1 3
4
GND2IN 1
15pF C3102NU
5V 5V9V3
9V3 9V3 9V3
9V3
5V 9V3
5V9V3
1
2 8
98
*
*
**
**
UHF (403-470 MHz) 25-40W IF
ZWG0130522-B 
						

							4-40UHF 25-40W Band1 PCB 8486127z01 / Schematics5.1 UHF PCB 8486127Z01 Parts List 
25-40W (LDMOS) 
Circuit 
RefMotorola 
Par t No.DescriptionC3101
2113740F34
20pF
C3102 2113740F31 15pF
C3103
2113740F39
33pF
C3104 2113743E20 0.1uF
C3110
2113740F37
27pF
C3111 2113743E20 0.1uF
C3112
2113740F49
82pF
C3114 2113740F33 18pF
C3115
2113740F35
22pF
C3116 2113743E20 0.1uF
C3121
2113743E20
0.1uF
C3122 2113743E11 0.039uF
C3123
2113743E11
0.039uF
C3124 2113740L30 33pF           3rd overtone xtal
C3124
NU
                   fundamental xtal
C3132 2113743E20 0.1uF
C3133
2311049A57
10uF
C3134 2113743E20 0.1uF
C3135
2113740L30
33pF
C3136 2113740F35 22pF           3rd overtone xtal
C3136
2113740L29
30pF           fundamental xtal
C3137 2113743E11 0.039uF
C3139
2113743E20
0.1uF
C3140 2113743E20 0.1uF
C3141
2113743E20
0.1uF
C3142 2113743E20 0.1uF
C3143
2113740F53
120pF
C3144 2113743E20 0.1uF
C3145
2113743E20
0.1uF
C3146 2113741F41 4700pF
C3147
2113743E20
0.1uF
C3151 2113741F49 10nF
C3152
2113741F49
10nF
C4001 2113740F09 1.8pF
C4002
2113740F39
33pF
C4003 2113740F40 36pF
C4004
2113740F39
33pF
C4005 2113740F39 33pF
C4006
2113740F39
33pF
C4007 2113740F38 30pF
C4008
2113741F25
1000pF
C4009 2113740F27 10pF
C4010
2113741F13
330pF
C4011 2113741F37 3300pF
C4012
2113741F13
330pF
C4013 2113741F37 3300pF
C4014
2113740F51
100pF
C4015 2113740F51 100pF
C4017
2113740F09
1.8pF
C4018 2113740F29 12pFC4019
2113740F29
12pF
C4020 2113740F39 33pF
C4021
2113740F39
33pF
C4022 2113740F39 33pF
C4023
2113740F29
12pF
C4024 2113741F25 1000pF
C4026
2113740F09
1.8pF
C4027 2113740F09 1.8pF
C4028
2113741F49
10nF
C4029 2113740F09 1.8pF
C4030
2113740F09
1.8pF
C4031 2113740F30 13pF
C4051
2113740F27
10pF
C4052 2113740F49 82pF
C4053
2113740F32
16pF
C4054 2113740F32 16pF
C4061
2113740F63
330pF
C4062 2113743E20 0.1uF
C4064
2113743E20
0.1uF
C4065 2113740F51 100pF
C4067
2113741F37
3300pF
C4068 2113740F51 100pF
C4069
2113741F49
10nF
C4201 2113740F51 100pF
C4202
2113741F49
10nF
C4203 2113741F49 10nF
C4204
2113740F51
100pF
C4205 2113741F49 10nF
C4206
2311049J25
10uF
C4208 2113743E20 0.1uF
C4209
2113743E20
0.1uF
C4210 2104993J02 2.2uF
C4211
2113743E20
0.1uF
C4213 2311049A09 2.2uF
C4214
2311049A09
2.2uF
C4215 2311049A09 2.2uF
C4217
2113741F49
10nF
C4221 2109720D01 0.01uF
C4222
2109720D14
0.1uF
C4224 0882422W23 1.0 uF
C4225
2113741F18
510pF
C4226 2113740L03 2.4pF
C4227
2113740F27
10pF
C4230 2104993J02 2.2uF
C4231
2113741F49
10nF
C4232 2113741F49 10nF
C4233
2104993J02
2.2uF
C4234 2113741F49 10nF
C4235
2113741F49
10nF
C4236 2113743E12 0.047uF
Circuit 
RefMotorola 
Part No.Description
C4242
2113740F51
100pF
C4243 2113740F51 100pF
C4244
2113740F51
100pF
C4245 2113740F51 100pF
C4246
2113740F51
100pF
C4251 2113743E20 0.1uF
C4252
2113741F25
1000pF
C4253 2311049A56 4.7uF
C4254
2113743E20
0.1uF
C4255 2113740F51 100pF
C4263
2113743E20
0.1uF
C4287 2113740F51 100pF
C4289
2113743E20
0.1uF
C4301 2113740F51 100pF
C4302
2113740L16
8.2pF
C4303 2113740L16 8.2pF
C4304
2113740L08
3.9pF
C4306 2113740L01 2pF
C4307
2113740F51
100pF
C4308 2113743E20 0.1uF
C4309
2113740F51
100pF
C4311 2113740F51 100pF
C4312
2113740F29
12pF
C4314 2113740F07 1.5pF
C4315
2113740F51
100pF
C4316 2109720D14 0.1uF
C4318
2113743E20
0.1uF
C4321 2113740F03 1pF
C4324
2113740L03
2.4pF
C4325 2311049A56 4.7uF
C4331
2113740L14
6.8pF
C4335 2113740F51 100pF
C4336
2113743E07
0.022uF
C4337 2113740F44 51pF
C4338
2113740F44
51pF
C4351 2113740F51 100pF
C4352
2113743E20
0.1uF
C4353 2113743E20 0.1uF
C4354
2104993J02
2.2uF
C4355 2104993J02 2.2uF
C4361
2113741F25
1000pF
C4364 2113740F21 5.6pF
C4365
2113740F07
1.5pF
C4371 2113743E20 0.1uF
C4401
2113740F51
100pF
C4403 2113740F17 3.9pF
C4404
2113740F51
100pF
C4407 2113743E20 0.1uF
C4409
2113743E20
0.1uF
C4410 2113740F51 100pF
C4412
2113740F51
100pF
Circuit 
RefMotorola 
Part No.Description
C4413 2113740F51 100pFC4414
2113743E07
0.022uF
C4415 2113740F51 100pF
C4416
2113743E07
0.022uF
C4417 2113740F44 51pF
C4418
2113743E20
0.1uF
C4420 2113740A31 12pF
C4421
2113741A57
0.033uF
C4422 2111078B42 100pF
C4425
2113743E07
0.022uF
C4426 2113740F51 100pF
C4427
2113740A18
4.3pF
C4428 2113740A61 180pF
C4429
2113740A61
180pF
C4431 2113740A39 27pF
C4432
2113740A46
47pF
C4433 2113740A46 47pF
C4434
2113740A18
4.3pF
C4435 2113740A31 12pF
C4436
2311049A45
10uF
C4438 2113743E20 0.1uF
C4439
2111078B42
100pF
C4440 2111078B29 33pF
C4441
2111078B29
33pF
C4442 2111078B16 13pF
C4443
2111078B09
6.8pF
C4444 2111078B16 13pF
C4445
2111078B09
6.8pF
C4448 2180464E65 12pF
C4449
2111078B03
3.9pF
C4450 2111078B03 3.9pF
C4454
2113740A18
4.3pF
C4457 2113740A42 36pF
C4459
2113740A55
100pF
C4462 2113740F41 39pF
C4469
2113740A55
100pF
C4472 2111078B31 36pF
C4473
2113740F51
100pF
C4474 2113740F29 12pF
C4475
2113740F10
2pF
C4478 2113741A21 1000pF
C4479
2113740F51
100pF
C4481 2113741A32 3000pF
C4483
2113740A55
100pF
C4484 2113740F38 30pF
C4485
2113740F38
30pF
C4487 2111078B01 3.3pF
C4488
2113740F51
100pF
C4491 2111078B01 3.3pF
C4492
2111078B42
100pF
C4494 2180464E63 10pF
Circuit 
RefMotorola 
Par t No.Description 
						

							UHF 25-40W Band1 PCB 8486127z01 / Schematics4-41C4495
2113741A21
1000pF
C4496 2111078B08 6.2pF
C4497
2113741A21
1000pF
C4498 2111078B08 6.2pF
C4499
2113740F51
100pF
C4502 2113743E01 0.012uF
C4503
2113741F17
470pF
C4504 2113741F49 10nF
C4505
2311049A07
1uF
C4506 2113741F33 2200pF
C4507
2113740F51
100pF
C4510 2111078B31 36pF
C4521
2113740F51
100pF
C4522 2113741F25 1000pF
C4602
2113741A57
0.033uF
C4629 2113740F51 100pF
C4630
2113743E20
0.1uF
C4631 2113743E20 0.1uF
C4632
2113740F51
100pF
CR4301 4805649Q13 DIODE VCTR ISV 228
CR4302
4862824C01
DIODE VARACTOR
CR4303 4862824C01 DIODE VARACTOR
CR4311
4802245J22
DIODE, VARACTOR
CR4321 4862824C01 DIODE VARACTOR
D3101
4880154K03
DIODE DUAL SCHOTTKY
D4001 4862824C01 DIODE VARACTOR
D4002
4862824C01
DIODE VARACTOR
D4003 4880154K03 DIODE DUAL SCHOTTKY
D4004
4862824C01
DIODE VARACTOR
D4005 4862824C01 DIODE VARACTOR
D4006
4880142L01
DIODE
D4007 4813833C02 DIODE, DUAL 70V
D4051
4886143B01
DIODE, MIXER
D4201 4802233J09 DIODE, TRIPLE
D4221
4813825A05
DIODE
D4451 4813825A05 DIODE
D4452
4813825A05
DIODE
D4453 4813825A05 DIODE
D4471
4802482J02
DIODE, SMD PIN
D4472 4802482J02 DIODE, SMD PIN
FL3101
9180112R16
2 POLE 44.85 MHZ CRYSTAL 
FILTER
FL3102 9180112R16 2 POLE 44.85 MHZ CRYSTAL 
FILTER
F L 3 111
9180469V03
CERAMIC FILTER, 455KHz
FL3112 9180469V06 CERAMIC FILTER, 455KHz
FL3114
9180468V06
CERAMIC FILTER, 455KHz
FL3115 9180469V04 CERAMIC FILTER, 455KHz
J4401
0986166B02
RF CONNECTOR (MINI UHF)
L3101 2462587T25 620nH
L 3 111
2462587T25
620nH
Circuit 
RefMotorola 
Par t No.Description
L3112 2462587T25 620nHL3124
2462587N68
1uH             3rd overtone xtal
L3124 NU                    fundamental xtal
L4003
2462587T23
470nH
L4006 2462587V24 15nH
L4008
2462587T23
470nH
L4051 2462587T17 150nH
L4053
2462587N46
27nH
L4054 2462587N43 15nH
L4201
2462587Q42
390nH
L4221 2462587P25 12uH
L4231
2462587Q20
2.2uH
L4301 2462587T22 390nH
L4302
2462587T22
390nH
L4303 2460593C01 RESONATOR
L4304
2462587T22
390nH
L4305 2462587T22 390nH
L4311
2462587T22
390nH
L4312 2460593C01 RESONATOR
L4313
2462587T22
390nH
L4331 2462587T09 33nH
L4333
2462587T22
390nH
L4361 2462587T09 33nH
L4362
2462587T09
33nH
L4371 2462587T13 68nH
L4401
2460591B04
11 . 0 3 n H
L4402 2484657R01 FERRITE BEAD
L4403
2462587T22
390nH
L4411 2462587T22 390nH
L4421
2484657R01
FERRITE BEAD
L4436 2484657R01 FERRITE BEAD
L4437
2460592A01
17nH
L4438 2460592A01 17nH
L4472
2460592A01
17nH
L4473 2460591N36 43.67nH
L4489
2460591B77
13.9nH
L4490 2460591B77 13.9nH
L4491
2460592A01
17nH
L4492 2460592A01 17nH
L4493
2460592A01
17nH
L4541 2484657R01 FERRITE BEAD
L4543
2460591C23
13.85nH
M3421 2686201B01 HEAT SPREADER
Q3101
4813827A07
NPN
Q3102 4813827A07 NPN
Q3141
4880214G02
NPN
Q3151 4880048M01 NPN
Q3152
4880048M01
NPN
Q4002 4813824A17 PNP
Q4003
4813827A07
NPN
Q4004 4805921T02 DUAL NPN/PNP
Circuit 
RefMotorola 
Part No.Description
Q4221
4880048M01
NPN
Q4301 4805218N63 DIODE DUAL SCHOTTKY
Q4332
4813827A07
NPN
Q4333 4809939C05 DUAL NPN/PNP
Q4421
4886212B01
POWER TRANSISTOR - 
MRF1518
Q4441 4813828C32 POWER TRANSISTOR - 
MRF1570
Q4471
4880048M01
NPN
Q4472 4805128M27 PNP
Q4473
4880214G02
NPN
R3101 0662057A75 12K
R3102
0662057A01
10
R3105 0662057A25 100
R3106
0662057A83
27K
R3107 0662057A69 6.8K
R3108
0662057A44
620
R3111 0662057A75 12K
R3112
0662057A01
10
R3113 0662057A37 330
R3115
0662057A39
390
R3116 0662057A37 330
R3117
0662057A83
27K
R3118 0662057A69 6.8K
R3123
NU
                  3rd overtone xtal
R3123 0662057B47 0                 fundamental xtal
R3124
0662057A49
1K               3rd overtone xtal
R3124 NU                   fundamental xtal
R3130
0662057A18
51
R3132 0662057A77 15K
R3133
0662057A71
8.2K
R3134 0662057A73 10K
R3135
0662057A51
1.2K
R3141 0662057A39 390
R3142
0662057A55
1.8K
R3144 0662057A58 2.4K
R3145
0662057A61
3.3K
R3146 0662057A45 680
R3147
0662057A75
12K
R3148 0662057B47 0
R3151
0662057A73
10K
R3152 0662057A73 10K
R3153
0662057A73
10K
R3154 0662057A73 10K
R4001
0662057A97
100K
R4002 0662057A37 330
R4003
0662057A63
3.9K
R4004 0662057A59 2.7K
R4005
0662057A73
10K
R4007 0662057A25 100
R4012
0662057A97
100K
Circuit 
RefMotorola 
Part No.Description
R4013 0662057A35 270R4014
0662057A01
10
R4016 0662057A61 3.3K
R4018
0662057A61
3.3K
R4022 0662057B47 0
R4051
0662057A18
51
R4052 0662057B47 0
R4060
0662057B10
330K
R4061 0662057A73 10K
R4062
0662057A53
1.5K
R4063 0662057A39 390
R4064
0662057B47
0
R4068 0662057A53 1.5K
R4069
0662057A49
1K
R4070 0662057A39 390
R4071
0662057A73
10K
R4072 0662057A73 10K
R4201
0662057A29
150
R4203 0662057A17 47
R4204
0662057A17
47
R4211 0662057B47 0
R4221
0662057A29
150
R4222 0662057A42 510
R4223
0662057A21
68
R4224 0662057A89 47K
R4225
0662057A89
47K
R4228 0662057A73 10K
R4241
0662057A33
220
R4251 0662057A87 39K
R4252
0662057A84
30K
R4261 0662057A89 47K
R4263
0662057A25
100
R4301 0662057A67 5.6K
R4302
0662057A73
10K
R4303 0662057A12 30
R4304
0662057A31
180
R4305 0662057A01 10
R4311
0662057A70
7.5K
R4312 0662057A67 5.6K
R4313
0662057A12
30
R4314 0662057A35 270
R4315
0662057B47
0
R4321 0662057A91 56K
R4322
0662057A73
10K
R4323 0662057A97 100K
R4331
0662057A09
22
R4341 0662057B47 0
R4342
0662057A57
2.2K
R4343 0662057A49 1K
R4344
0662057A01
10
R4346 0662057A73 10K
Circuit 
RefMotorola 
Part No.Description 
						

							4-42UHF 25-40W Band1 PCB 8486127z01 / Schematics
*  Motorola Depot Servicing only
Reference designators with an asterisk indicate 
components which are not fieldreplaceable 
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.
R4347
0662057B47
0
R4360 0662057A35 270
R4361
0662057A31
180
R4362 0662057A01 10
R4363
0662057A49
1K
R4381 0662057A41 470
R4401
0662057A36
300
R4402 0662057A05 15
R4403
0662057A36
300
R4405 0662057A32 200
R4408
0662057A80
20K
R4409 0662057A97 100K
R4412
0662057A56
2K
R4415 0662057A15 39
R4416
0662057A15
39
R4422 0611079A69 620
R4423
0611079A69
620
R4424 0611079A69 620
R4425
0611079A69
620
R4428 0662057A55 1.8K
R4440
0662057B47
0
R4457 0683962T51 120
R4473
0662057A64
4.3K
R4474 0662057A97 100K
R4475
0662057B47
0
R4480 0662057A73 10K
R4481
0662057C44
51
R4482 0662057B09 300K
R4483
0662057A97
100K
R4484 0662057A93 68K
R4485
0662057C44
51
R4486 0662057C44 51
R4489
0662057C44
51
R4491 0662057A74 11K
R4492
0662057A73
10K
R4495 0680195M18 51
R4496
0680194M23
82
R4497 0680195M18 51
R4501
0662057A67
5.6K
R4502 0662057A93 68K
R4503
0662057A63
3.9K
R4504 0662057A73 10K
R4506
0662057A73
10K
R4507 0662057A73 10K
R4511
0680194M18
51
R4512 0662057A41 470
R4513
0662057A73
10K
R4514 0662057A61 3.3K
R4631
0662057A89
47K
R4632 0662057A89 47K
R4634
0662057A97
100K
Circuit 
RefMotorola 
Par t No.Description
R4635 0662057A97 100KSH4301
2602641Y02
SHIELD
SH4302 2602641Y02 SHIELD
T4051
2505515V03
TRANSFORMER 4:1
T4052 2505515V04 TRANSFORMER 5:1
U3101
5186144B01
IC, IF
U3111 5102463J52 QUAD ANALOG SWITCH
U3115
5102463J52
QUAD ANALOG SWITCH
U4201 5185963A27 IC FRACTN
U4211
5105739X05
IC, VOLTAGE REGULATOR
U4301 5105750U54 IC, VCO
U4401
5185130C65
IC LDMOS DRIVER
U4501 5185765B26 IC POWER CONTROL 
U4502
5185963A15
IC TEMPERATURE SENSOR
VR4471 4813830A15 DIODE, 5.6V
VR4473
4813830A15
DIODE, 5.6V
Y3101 4880606B09 2ND OSC XTAL 44.395 MHZ
 fundamental xtal
Y3101
4802245J84
2ND OSC XTAL 44.395 MHZ
3rd overtone xtal
Y3102 9186145B02 455KHz DISCRIMINATOR
Y4262
4886182B01
TCXO 16.8MHZ
Circuit 
RefMotorola 
Part No.Description 
						

							 Professional Radio
GM Series
UHF (403-470MHz)
Service Information
Issue: August 2002 
						

							ii
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. 
						

							iii
Table of Contents
Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS
1.0 GM140/GM160 Model Chart ................................................................................ 1-1
2.0 GM340/GM360/GM380 Model Chart ................................................................... 1-1
3.0 GM640/GM660/GM1280 Model Chart ................................................................. 1-2
4.0 Technical Specifications ...................................................................................... 1-3
Chapter 2 THEORY OF OPERATION
1.0 Introduction .......................................................................................................... 2-1
2.0 UHF (403-470MHz)  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 ............................. 2-2
3.0 UHF (403-470MHz) 
 Transmitter Power Amplifier (PA) 25 W.................... 2-3
3.1 First Power Controlled Stage .......................................................................... 2-3
3.2 Power Controlled Driver Stage ....................................................................... 2-4
3.3 Final Stage...................................................................................................... 2-4
3.4 Directional Coupler......................................................................................... 2-4
3.5 Antenna Switch............................................................................................... 2-5
3.6 Harmonic Filter ............................................................................................... 2-5
3.7 Power Control ................................................................................................. 2-5
4.0 UHF (403-470MHz)  Frequency Synthesis .......................................................... 2-6
4.1 Reference Oscillator ....................................................................................... 2-6
4.2 Fractional-N Synthesizer ................................................................................ 2-6
4.3 Voltage Controlled Oscillator (VCO) ............................................................... 2-7
4.4 Synthesizer Operation .................................................................................... 2-8
5.0 UHF (403-470MHz)  
Transmitter Power Amplifier (PA) 45 W.................... 2-9
5.1 Power Controlled Stage .................................................................................. 2-9
5.2 Pre-Driver Stage ............................................................................................. 2-9
5.3 Driver Stage .................................................................................................. 2-10
5.4 Final Stage.................................................................................................... 2-10
5.5 Directional Coupler....................................................................................... 2-10
5.6 Antenna Switch............................................................................................. 2-10
5.7 Harmonic Filter ............................................................................................. 2-10
5.8 Power Control ............................................................................................... 2-11 
						

							iv
Chapter 3 TROUBLESHOOTING CHARTS
1.0 Troubleshooting Flow Chart for Receiver (Sheet 1 of 2) ..................................... 3-1
1.1 Troubleshooting Flow Chart for Receiver (Sheet 2 of 2) ..................................... 3-2
2.0 Troubleshooting Flow Chart for 25W Transmitter (Sheet 1 of 3) ......................... 3-3
2.1 Troubleshooting Flow Chart for 25W Transmitter (Sheet 2 of 3) ......................... 3-4
2.2 Troubleshooting Flow Chart for 25W Transmitter (Sheet 3 of 3) ......................... 3-5
3.0 Troubleshooting Flow Chart for 40W Transmitter  ............................................... 3-6
4.0 Troubleshooting Flow Chart for Synthesizer........................................................ 3-7
5.0 Troubleshooting Flow Chart for VCO ................................................................... 3-8
Chapter 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 1-25W PCB 8485670z02 / Schematics ....................................................... 4-3
2.1 UHF 1-25W PCB 8485670z02 Parts List........................................................... 4-10
3.0 UHF 25-40W PCB 8480643z06 / Schematics ................................................... 4-13
3.1 UHF 25-40W PCB 8480643z06 Parts List......................................................... 4-20
4.0 UHF 1-25W PCB 8485670z03 / Schematics ..................................................... 4-23
4.1 UHF 1-25W PCB 8485670z03 Parts List........................................................... 4-30
5.0 UHF 1-25W PCB 8486127z01 / Schematics ..................................................... 4-33
5.1 UHF 1-25W PCB 8486127z01 Parts List........................................................... 4-40 
						

							Chapter 1
MODEL CHART AND TECHNICAL SPECIFICATIONS
1.0 GM140/GM160 Model Chart
GM Series UHF 403-470 MHz
Model Description
MDM25RKC9AN1_EGM140, 403-470 MHz, 25-40W, 4 Ch
MDM25RKF9AN5_E GM160, 403-470 MHz, 25-40W, 128 Ch
MDM25RHC9AA1_EGM140, 403-470 MHz, 1-25W, 4 Ch
MDM25RHF9AA5_E GM160, 403-470 MHz, 1-25W, 128 Ch
Item Description
XXGCN6112_Control Head GM140
X X GCN6120_ Control Head GM160
XIMUE6012_Tanapa, GM140
X IMUE6012_ Tanapa, GM160
XIMUE6021_Tanapa, GM140
X IMUE6021_ Tanapa, GM160
XXXXENBN4056_Packaging, Waris Mobile Radio
XXXXGLN7324_ Low Profile Mounting Trunion
XXHKN9402_12V Power Cable, 25-45W
X X HKN4137_ 12V Power Cable, 1-25W
XXXXMDRMN4025_Enhanced Compact Microphone
X X 6864110B86_ User Guide, GM140
XX6864110B87_User Guide, GM160
X = Indicates one of each is required 
						

							1-2 MODEL CHART AND TECHNICAL SPECIFICATIONS
2.0 GM340/GM360/GM380 Model Chart
GM Series UHF 403-470 MHz
Model Description
MDM25RHC9AN1_EGM340, 403-470 MHz, 1-25W, 6 Ch
MDM25RHF9AN5_E GM360, 403-470 MHz, 1-25W, 255 Ch
MDM25RHC9AN8_EGM380, 403-470 MHz, 1-25W, 255 Ch
MDM 25 RH A9A N0_E   Datab ox, 4 03-4 70  MHz,  1-2 5W , 16  Ch
Item Description
XGCN6112_Control Head GM340
X GCN6120_ Control Head GM360
XGCN6121_Control Head GM380
X GCN6116_ Databox Radio Blank Head
XIMUE6015_SField Replaceable Unit (Main Board) GM340
X IMUE6015_S Field Replaceable Unit (Main Board) GM360
XIMUE6038_SField Replaceable Unit (Main Board) GM380
X IMUE6015_A S/T 403-470MHz 1-25 SEL5
XXXXENBN4056_Packaging, Waris Mobile
XXXXGLN7324_ Low Profile Mounting Trunnion
XXXXHKN4137_12V Power Cable 1-25W
X X X MDRMN4025_ Enhanced Compact Microphone
X6864110B80User Guide GM340
X 6864110B81 User Guide, GM360
X6864110B82User Guide, GM380
X = Indicates one of each is required