Motorola Gm328 Gm338 Gm398 Detailed 6804112j18 E Manual

UHF 1-25W PCB / Schematics / Parts List4-19
9180469V03
3VDC3.9VDC 12.5kHz  0VDC
20/25kHz  5VDC 9180469V069180469V04
0.75VDC
0.75VDC3VDC9180468v04
9180468V06 U3111-1
CNTL
131
2VDD
14VSS7
R3116
330MC74HC4066
82pF C3112
Q3152
R3135
1.2KBWSELECT_UHF_IF_1
R3132
DISCAUDIO_UHF_IF_1 15K
680 R314610K R3151
0.1uF C3139 C3132
0.1uF R3117
27K
IFQ3102
10 R3112
1.8K R3142R3154
10K
C3110
27pF
C3140
0.1uF 620nHL3111VDD
7VSS
620 R3108
U3115-2
MC74HC4066
5CNTL4 314
0.1uF C3144 FL3111
CFWC455G
3GND1
GND2
4
1
IN2
OUT
C3141...

4-20UHF 1-25W PCB / Schematics / Parts ListUHF PCB 8485670Z03 Parts List 1-25W
Circuit 
RefMotorola 
Part No.DescriptionC3101
2113740F34
20pF
C3102 2113740F31 15pF
C3103
2113740F39
33pF
C3104 2113743E20 10uF
C3110
2113740F37
27pF
C3111 2113743E20 10uF
C3112
2113740F49
82pF
C3114 2113740F33 18pF
C3115
2113740F35
22pF
C3116 2113743E20 10uF
C3121
2113743E20
10uF
C3122 2113743E11 0.039uF
C3123
2113743E11
0.039uF
C3132 2113743E20 10uF
C3133
2311049A57
10uF
C3134 2113743E20 10uF
C3135
2113740L30
33pF
C3136...

UHF 1-25W PCB / Schematics / Parts List4-21CR4303 4862824C01 DIODE, VARACTORCR4311
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
D4401 4813833C02...

4-22UHF 1-25W PCB / Schematics / Parts List
* 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.
R4429
0662057A59
2700 Ohm
R4431 0680194M18 51 Ohm
R4441
0662057A87
39K Ohm
R4442 0662057A57 2200 Ohm
R4443
0662057A87
39K Ohm
R4445...

 GM328/GM338/GM398
Mobile Radios
UHF Band 2 (450-527MHz)
Service Information
Issue: December, 2003 

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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...

i
Table of Contents
Section 1 Model Chart and Technical Specifications
1.0 GM328/GM338/GM398 Model Chart ................................................................... 1-1
2.0 Technical Specifications ...................................................................................... 1-2
Section 2 Theory of Operation
1.0 Introduction .......................................................................................................... 2-1
2.0 UHF (450-527 MHz) Receiver...

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 Band 2 1-25W PCBs / Schematics / Parts List ............................................ 4-3
UHF Band 2 (450-527 MHz) 1-25W 8485671Z03 Top Side................................... 4-3
UHF Band 2 (450-527 MHz) 1-25W 8485671Z03...

1-1
Section 1
MODEL CHART AND TECHNICAL SPECIFICATIONS
1.0 GM328/GM338/GM398 Model Chart
GM Series, UHF Band 2, 450-527 MHz
Model Description
AZM25SHC9AA1GM328 450-527 MHz 1-25W
AZM25SHF9AA5 GM338 450-527 MHz 1-25W
AZM25SHN9AA8GM398 450-527 MHz 1-25W
Item Description
X GCN6112_ GM328 Control Head Direct Mount
XGCN6114_GM338 Control Head Direct Mount
X GCN6115_ GM398 Control Head Direct Mount
XXIMUE6022_Tanapa WM 450-527 MHz 1-25W
X IMUE6043 Tanapa WM 450-527 MHz 1-25W
XXXRAE4155_BNC 470-512 MHz, 1/4 Wave...

1-2Technical Specifications
2.0 Technical Specifications
Data is specified for +25°C unless otherwise stated.
General Specifications
Channel Capacity
GM328
GM338
GM398
4
128
160
Power Supply 13.2Vdc (10.8 - 15.6Vdc)
Dimensions:  H x W x D (mm)  Depth excluding knobsGM328
56mm x 176mm x 177mm
(add 8mm for Volume Knob)
Dimensions:  H x W x D (mm)  Depth excluding knobsGM338
59mm x 179mm x 186mm (1 - 25W)
59mm x 179mm x 198mm (25 - 45W)
(add 9mm for Volume Knob)
Dimensions:  H x W x D (mm)  Depth excluding...