MOTOROLA GP350 User Guide

GP350

Portable Radios

146-174 MHz
438-470 MHz

6880904Z07-O

*6880904Z07**6880904Z07*

6880904Z07-O

Motorola

Radius Division

Hwy 34 West

Mt. Pleasant, IA 52641

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 pro-

grams contained in the Motorola products described in this manual may not be copied or reproduced in any manner without the express written per-

mission 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.

Airbag W ar ning Statement

WARNING

!

VEHICLES EQUIPPED WITH AIR BAGS

An air bag inflates with great force. DO NOT place objects, including communication equipment,
in the area over the air bag or in the air bag deployment area. If the communication equipment is
improperly installed and the air bag inflates, this could cause serious injury.

• Installation of vehicle communication equipment should be performed by a professional
installer/technician qualified in the requirements for such installations. An air bag’ s size, shape and
deployment area can vary by vehicle make, model and front compartment configuration (e.g.,
bench seat vs. bucket seats).

• Contact the vehicle manufacturer’s corporate headquarters, if necessary, for specific air bag
information for the vehicle make, model and front compartment configuration involved in your
communication equipment installation.

Table of Contents

Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

How to Use This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Other Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Service Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Ordering Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Model Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix

Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi

Service Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii

Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii

Test Set Service Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii

Radio Model Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii

Radio Service Software Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv

Configuring the RIB and Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv

Section 1
Safety Information

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

FCC Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Section 2
Intrinsically Safe Radio Information

FMRC Approved Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Repair of FMRC Approved Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Relabeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Do Not Substitute Options or Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Section 3
Disassembly/Reassembly

Remove Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Remove Belt Clip from Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Remove Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Remove the Main Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Re-assembly of Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

6880904Z07-O i

GP350 Portable Radios Service Manual

Section 4
Theory of Operation

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Microcomputer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Microcomputer Power-Up and Reset Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Intermediate Frequency (IF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Frequency Generation Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

VCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

TX Audio Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Internal MIC Bias Switch and External PTT Sense Circuits . . . . . . . . . . . . . . . . . . 4-4

MIC Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

TX Audio Mute Gate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Pre-emphasis Amplifier (standard models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Option Interface Connector P1 (Keypad/Display models) . . . . . . . . . . . . . . . . . . . 4-4

Limiter (Audio Filter IC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Post-Limiter Filter (Audio Filter IC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

PL Encoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

DTMF Encoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Deviation Attenuators (Audio Filter IC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

RX Audio Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

PL Rejection Filter (Audio Filter IC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

PL Decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Center-Slicer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Option Interface Connector P1 (Keypad/Display Models) . . . . . . . . . . . . . . . . . . . 4-5

RX Audio Mute Gate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Audio Power Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Noise Squelch Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Vox Circuit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

GP350 Portable Radio Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Receiver, Transmitter, VCO, Synthesizer, and AFIC Block Diagrams . . . . . . . . . . . . . . . . . . . 4-8

Section 5
Troubleshooting

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Troubleshooting Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Troubleshooting Flow Chart for Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Troubleshooting Flow Chart for Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Troubleshooting Flow Chart for Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

Troubleshooting Flow Chart for Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5

Troubleshooting Flow Chart for VCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

ii 6880904Z07-O August, 1996

GP350 Portable Radios Service Manual

Section 6
Component Location Diagrams, Schematic Diagrams,
Exploded Views, and Parts Lists

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Schematic Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Parts List: 0180702Y89 Battery Filter Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Parts List: Flex Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Component Location Diagrams, Schematic Diagrams, and Parts Lists for

Battery Filter Board and Flex Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Component Location Diagram for HLD9440A and HLD9441A

VHF, 146-174MHz, Transceiver and Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Schematic Diagram for HLD9440A and HLD9441A

VHF, 146-174MHz, Transceiver Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Component Location Diagram for HLE9480A and HLE9481A

UHF, 438-470MHz, Transceiver Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Schematic Diagram for HLE9480A and HLE9481A

UHF, 438-470MHz, Transceiver Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

Schematic Diagram for Controller Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6

Parts List: Controller Components (for all bandsplits) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

Parts List: HLD9440A and HLD9441A, 146-174MHz VHF Transceiver. . . . . . . . . . . . . . . . . 6-8

Parts List: HLE9480A and HLE9481A, 438-470MHz UHF Transceiver . . . . . . . . . . . . . . . . . 6-9

Parts List: GP350 Basic Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10

HLN9960A DTMF Circuit Board Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11

HLN9960A DTMF Schematic Diagram and Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12

Battery Chargers Single and Multi-Unit Rapid Rate (1 Hour). . . . . . . . . . . . . . . . . . . . . . . . . 6-13

Battery Chargers Single and Multi-Unit Rapid Rate (1 Hour). . . . . . . . . . . . . . . . . . . . . . . . . 6-14

Battery Chargers Standard Rate (10 Hour) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15

Battery Chargers Standard Rate (10 Hour) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16

Schematic Diagram and Parts List for HMN9041A Remote Speaker/Microphone . . . . . . . . 6-17

Exploded View and Parts List for HMN9041A Remote Speaker/Microphone . . . . . . . . . . . . 6-18

August, 1996 6880904Z07-O iii

GP350 Portable Radios Service Manual

iv 6880904Z07-O August, 1996

v

GP350 Portable Radios Service Manual Foreword

Scope of Manual

Scope of Manual

This manual is intended for use by experienced technicians
familiar with similar types of equipment. It contains all ser­vice information required for the equipment described and is
current as of the printing date. Changes which occur after the
printing date are incorporated by instruction manual revi­sion. These revisions are added to the manuals as the engi­neering changes are incorporated into the equipment.

How to Use This Manual

This manual contains introductory material such as model
charts, accessories, and specifications, as well as four sec­tions that deal with specific service aspects of the GP350.
Refer to the Table of Contents for a general overview of the
manual, or to the “Overview” paragraph in each section for
a specific overview of the information in that section.

Other Documentation

Table 1 lists other documentation for the GP350 Portable
Radios.

Table 1. Other Documentations

Information Location

Basic Use of GP350 GP350 User Guide (6880904Z01)
Programming GP350 RSS Manual (6880904Z09)

chassis or kit which contains the part, and a detailed descrip­tion of the desired component. If a Motorola part number is
identified on a parts list, you should be able to order the part
through Motorola Parts. If only a generic part is listed, the
part is not normally available through Motorola. If no parts
list is shown, generally, no user serviceable parts are avail­able for the kit.

Technical Support (U.S. and Canada)

Radius Product Services
Hwy. 34 West
Mt. Pleasant, IA 52641 USA
1-800-356-1520 (U.S. and Canada)
319-385-5395 (Outside U.S.)

Technical Support (Latin America, Mexico, Caribbean)

1-800-694-2161 (Latin America, Mexico, Caribbean)

Radius 30-Day Warranty

Radius Repair Depot
Attention: W arranty Return
1000 W . Washington Street
Mt. Pleasant, IA 52641 USA
1-800-356-1520
319-385-5395 (Outside U.S.)

Radius Major Component Repair

Radius Repair Depot
1000 W . Washington Street
Mt. Pleasant, IA 52641 USA

Technical Support

T o obtain technical support, you may call Motorola’ s Radius
Product Services. When you call, we ask that you have ready
the model and serial numbers of the respective radio or its
parts.

Service Policy

If malfunctions occur within 30 days that cannot be resolved
over the phone with Radius Product Services, a defective
major component should be returned. You must obtain autho­rization from Radius Product Services before returning the
component.

Ordering Replacement Parts

You can order additional components and some piece parts
directly through your Radius price pages. When ordering
replacement parts, include the complete identification num­ber for all chassis, kits, and components. If you do not know
a part number, include with your order the number of the

Motorola Parts

Americas Parts Division
Attention: Order Processing
1313 E. Algonquin Road
Schaumburg, IL 60196

Customer Service Motorola Parts

1-800-422-4210
1-708-538-8198 (FAX)

Parts Identification

1-708-538-0021
1-708-538-8194 (FAX)

August, 1996 6880904Z07-O

Foreword GP350 Portable Radios Service Manual

Model Charts

Model Charts

GP350

VHF

146 - 174 MHz

X = Indicates one of each required

Description

Model

16-Chan., 20/25 kHz (146-174 MHz)

2-Chan., 20/25 kHz (146-174 MHz)

P93MGC20A2A_

P93MGC20C2A_

Item Description

X X HHN9126_ Housing
X HLD9440_ RF Board, 2-Chan., 20/25 kHz, (146-174 MHz)

X HLD9441_ RF Board, 16-Chan., 20/25 kHz, (146-174 MHz)
X X HLN8255_ Spring-Action Belt Clip, 3”
X X HLN9152_ Chassis Hardware Assembly
X HLN9202_ 2-Channel Control Kit

X HLN9203_ 16-Channel Control Kit
X X NAD6502_ Antenna (146-174 MHz)
X X 6880904Z01 Users Guide/Quick Reference Card

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6880904Z07-O August, 1996

GP350 Portable Radios Service Manual Foreword

Model Charts

GP350

UHF

438 - 470 MHz

X = Indicates one of each required

Description

2-Chan., 20/25 kHz (438-470 MHz)

16-Chan., 20/25 kHz (438-470 MHz)

Model

P94MGC20C2A_

P94MGC20A2A_

XX
X

X
XX
XX
X

X
XX
XX

Item Description

HHN9126_ Housing
HLE9480_ RF Board, 2-Chan., 20/25 kHz (438-470 MHz)
HLE9481_ RF Board, 16-Chan., 20/25KHz, (438-470 MHz)
HLN8255_ Spring-Action Belt Clip, 3”
HLN9152_ Chassis Hardware Assembly
HLN9202_ 2-Channel Control Kit
HLN9203_ 16-Channel Control Kit
NAE6483_ Antenna
6880904Z01 User Guide /Quick Reference Card

August, 1996 6880904Z07-O

vii

Foreword GP350 Portable Radios Service Manual

Model Charts

GP350

UHF
465 - 495 MHz
490 - 520 MHz

X = Indicates one of each required

Description

16-Chan., 20/25 kHz (465-495 MHz)

16-Chan., 12.5 kHz (465-495 MHz)

16-Chan., 20/25 kHz (490-520 MHz)

16-Chan., 12.5 kHz (490-520 MHz)

Model

P94MGCC20C3A_

P94MGC00C3A_

X

X

X
XXXX
XXXX
XXXX
XXXX
XXXX

This page has been intentionally left blank.

P94MGC20C4A_

P94MGC00C4A_

Item Description

HLE9487_ RF Board, 12.5 kHz, (465-495 MHz)
HLE9485_ RF Board, 20/25 kHz, (465-495 MHz)
HLE9488_ RF Board, 12.5 kHz, (490-520 MHz)

X

HLE9489_ RF Board, 20/25 kHz, (490-520 MHz)
HLN9203_ 16-Channel Control Kit
HLN9152_ Chassis Hardware Assembly
HHN9126_ Housing
NAE6483_ Antenna
6880904z01 User Guide/Quick Reference Card

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GP350 Portable Radios Service Manual Foreword

Accessories

Accessories

Antennas:

NAD6502_R — Black 146-174 MHz VHF Antenna (Standard w/Unit)

HAD9742 — Black 146-162 MHz VHF Stubby Antenna

HAD9743 — Blue 162-174 MHz VHF Stubby Antenna

NAE6483_R — None 403-520 MHz UHF Antenna (Standard w/Unit)

NAE6521_R — Red 400-440 MHz UHF Stubby Antenna

NAE6522_R — Green 438-470 MHz UHF Stubby Antenna

HAD9728 — None Tunable Antenna Kit (136-174 MHz)

Note:

important to order the correct antenna (frequency split) to match a specific customer frequency.

Each of the color coded antennas listed is designed to cover only the frequency split indicated. Therefore, it is

Carrying Accessories:

HLN9417 Standard Leather Carry Case w/Belt Loop

HLN9323 Standard Leather Carry Case w/Swivel

HLN9416 Standard Nylon Carry Case

HLN9420 DTMF Standard Leather Carry Case w/Belt Loop

HLN9418 DTMF Standard Leather Carry Case w/Swivel

HLN9724 2-1/2” Belt Clip

HLN8255 Replacement Heavy Duty Spring Action 3” Belt Clip

HLN8052 Wrist Strap

NTN5243 Shoulder Strap (for all carry cases)

HLN8414 Chest Pack Carry Holder

42-5857B04 Replacement 3” Swivel Belt Loop (for use with same carry accessories as 2-1/2” Belt

Loop but with wider belts)

42-5857B05 Replacement 2-1/2” Swivel Belt Loop (for use with HLN9323, HLN9418)

42-80532B01 Replacement Strap for Nylon and Leather Carry Cases

42-80532B02 Replacement Strap for DTMF Carry Case

HLN9985 Waterproof Bag

August, 1996 6880904Z07-O

Foreword GP350 Portable Radios Service Manual
Accessories

Nickel-Cadmium Battery Chargers:

HTN9630 120 Volt - 1 Hour Rapid Rate Charger
HTN9702 120 Volt - 10 Hour Standard Rate Charger
HTN9748 120 Volt - 6 Unit - 1 Hour Rapid Rate Charger
HTN9802 220 Volt - 1 Hour Rapid Rate Charger (European Plug)
HTN9804 220 Volt - 10 Hour Standard Rate Charger (European Plug)
HTN9811 220 Volt - 6 Unit - 1 Hour Rapid Rate Charger (European Plug)
HTN9803 240 Volt - 1 Hour Rapid Rate Charger (U. K. Plug)
HTN9805 240 Volt - 10 Hour Standard Rate Charger (U. K. Plug)
HTN9812 240 Volt - 6 Unit - 1 Hour Rapid Rate Charger (U. K. Plug)
HLN9719 1 Hour Vehicular Charger Adapter/Bracket (12 volt for use with HTN9630 Rapid Rate Charger)
HLN9944 Wall Mounting Bracket For Multi Unit Charger

Batteries:

HNN9360 1200 mAH High Capacity Battery (Standard)
HNN9361 1200 mAH (Fully Approved FM Battery)

Audio/RF Accessories:

HMN9041 Remote Speaker Microphone (with GP350 connector)
BDN6720* Earpiece Without Volume Control (plastic earloop)
HMN9752_R* Earpiece With Volume Control (plastic earloop)
50-80386B90 Rubber Ear Inserts for Earpieces (with older metal earloop - pkg q. 25)
50-80371E73 Rubber Ear Inserts for Earpieces (with plastic earloop - pkg q. 25)
HMN9754_R* 2 Piece Surveillance Microphone (plastic earloop)
HMN9013* Light Weight Headset II
BDN6647* Medium Weight Single Speaker Headset w/Swivel Boom Microphone (compatible with

Internal VO X)
HMN9021* Medium Weight Dual Muff Headset w/Swivel Boom Microphone (Over the Head)
HMN9022* Medium Weight Dual Muff Headset w/Swivel Boom Microphone (Behind the Head)
BDN6648* Heavy Weight Headset w/Noise Cancelling Boom Microphone with PTT button (compatible with

Internal VO X)
BDN6646* Ear Microphone with PTT Interface
BDN6706* Ear Microphone w/VOX Interface (External VOX Included)
HLN9756 BNC - RF Adapter (for use with P110, GP300 and GP350 models only)
HLN9482 GP300 to GP350 Accessory Adapter

Prices And Availability Subject To Change Without Notice

* Accessories marked with an asterisk (*) require the HLN9482 (GP300 to GP350 Adapter Kit) for use on GP350 radios.

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6880904Z07-O August, 1996

xi

*

±

±

±

GP350 Portable Radios Service Manual Foreword

‡

†

Performance Specifications

Performance Specifications

GENERAL

VHF UHF

Model Series: P93MGC P94MGC
Frequency: 146-174 438-470
Channel Capacity: 2 or 16 channels

Power Supply: One (1) rechargeable Nickel-Cadmium battery (7.5V)
Dimensions†: 5.54” X 2.48” X 1.79” (142 X 63X 45.6mm)†
Weight †: 17.8 oz. (509 g)†
Average Battery Life

(5-5-90 Duty Cycle):
High Capacity:

Low Power

10.5 Hours

High Power

8 Hours

2 or 16 channels

Low Power

10.5 Hours

High Power

8 Hours

Environmental: Meets MIL-STD-810-C, D, and E & EIA RS-316B environmental specifications for vibration, shock, rain, dust, and

†Standard High Capacity Battery Model

TRANSMITTER

RF Output @ 7.5V: High

Freq. Separation: 26, 28 MHz 30, 32 MHz
Freq. Stability

(-30˚C to +60˚):
Modulation:

Spurs/Harmonics: 0.25 µ W < 2GHz
Audio Response:

(from 6 dB/oct.
Pre-Emphasis,
300 to 3000Hz

Audio Distortion: @
1000 Hz, 60% Rated
Max. Dev.

FCC
Designation:

FM Noise: -40 dB ‡

† Max.RF output is 3W for frequencies greater than 512 MHz

Typical level

5W

5 kHz max. (25/30 kHz channel spacing)

2.5 kHz max. (12.5 kHz channel spacing)

AZ489FT3784
AZ489FT3785

humidity

VHF UHF

Low

1W

High

4W †

0.0005%

+1, -3 dB

<3%

AZ489FT4802
AZ489FT4803
AZ489FT4804
AZ489FT4805

Low

1W

RECEIVER

VHF UHF

Channel Spacing: 25 kHz 12.5 kHz 25 kHz 12.5 kHz
Freq Separation: 26, 28 MHz 30, 32 MHz
Sensitivity

- 20 dB Quieting †:
12 dB EIA SINAD †:
20 dB SINAD †:

Squelch
Sensitivity:

Selectivity: 70dB 60dB 70dB 60dB
Intermodulation 70dB 60 dB 70 dB 60 dB
Freq. Stability

(-30˚C to +60˚C):
(-10˚C to +50˚C):

Spur Rejection
EIA:
CEPT:

Image Rejection
EIA:
CEPT:

Audio Output
at<10% Distortion
(1 kHz)

Typical specification is 0.28mV on frequencies greater than 512 MHz

0.32 µ V

0.22 µ V

0.30 µ V

75 dB
70 dB

0.38 µ V
N/A

0.35 µ V

10 dB SINAD

0.0005%

0.0003%

500mW

75 dB
70 dB

0.32 µ V

0.22 µ V‡

0.30 µ V

0.38 µ V
N/A

0.35 µ V

70 dB
70 dB

All specifications subject to change without notice.

August, 1996 6880904Z07-O

Foreword GP350 Portable Radios Service Manual
Service Aids

Service Aids

The following table lists service aids recommended for working on the GP350.

Motorola Part No. Description Application

HLN9214 Radio Interface Box Enables communication between the radio and the computer’s serial

HSN9412 RIB Power Supply Used to supply power to the RIB.

HKN9216 Computer Interface Cable Connects the computer’s serial communications adapter to the RIB.

HLN9390 AT to XT Computer Adapter Allows HKN9216 to plug into a XT style communications port.
HKN9857 Programming / Test Cable Connects radio to RIB. And can be used as a Battery Eliminator.
HVN9128 Radio Service Software Software on 3-1/2 in. diskette

HLN9482 GP300 to GP350 Accessory

Adapter

RTX4005 Portable Test Set Enables connection to the audio / accessory jack. Allows switching

RKN4034 Test Set Cable Connects radio to RTX4005B Test Box.

REX1143 Programming Adapter Kit Connects radio to programmer (HKN9857)

communications adapter.

Allows use of the RKN4034 Test Set Cable with the GP350 radio.

for radio testing.

Test Equipment

The following table lists test equipment required to service the GP350 and other two-way radios.

Motorola Model No. Description Characteristics Application

R2200, R2400, or R2001D
with trunking option

*R1049A Digital Multimeter Two meters recommended for ac/dc voltage

*S1100A Audio Oscillator 67 to 161.4Hz tones Used with service monitor for injection of PL

*S1053D,
*SKN6009A,
*SKN6001A

R1053 Dual-trace Oscilloscope 20 Mhz bandwidth,

*S1350C, *ST1215B
(VHF) *ST1223B (UHF)
*T1013A

S1339A RF Millivolt Meter 100uV to 3V rf, 10 khz to 1.2

*R1013A SINAD Meter Receiver sensitivity
S1347D or

S1348D (prog)

Service Monitor This monitor will substitute

AC Voltmeter, Power Ca­ble for meter, Test leads
for meter

Wattmeter, Plug-in Ele­ments (VHF& UHF), RF
Dummy Load

DC Power Supply 0-20 Vdc, 0-5 Amps Bench supply for 10Vdc

for items with an asterisk *

1mV to 300V, 10-Megohm
input impedance

5mV/cm - 20V/cm
50-ohm, +

Watts, maximum 0-1000
Mhz, 300W

Ghz

5% accuracy 10

Frequency/deviation meter and signal gener­ator for wide-range troubleshooting and
alignment

and current measurements

tones
Audio voltage measurements

Waveform measurements

Transmitter power output measurements

RF level measurements

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6880904Z07-O August, 1996

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00

A

1

GP350 Portable Radios Service Manual Foreword

Radio Model Information

Test Set Service Cable

20

C

A

NOTE: Pins 2 and 7

are cut.

4

12

3

11

2

1

(P1) DETAIL
FRONT SIDE

External
Speaker

5

6

7

14

8

9

External

Microphone

VIEWED FROM POGO PIN

SIDE OF ADAPTER

NOTE: For proper speaker impedance, the RTX4005B
test set Audio out switch must be set to the “MX” position

External
Select

Ground

Speaker
Common

MAEPF-25490-O

3.5 mm plug

tip

sleeve

sleeve

tip

2.5 mm plug

47 ohm, 1/2w

1.0 uF

+

33k, 1/8 w

P1

6

12

Speaker (Hi)

14

Speaker (Lo)

9

11

2
3

Gnd
Mic. Audio

4

PTT

5

1

7
8

Figure 1. Service Cable (RKN4034A) for the Test Set (RTX4005B)

Radio Model Information

The model number, serial number , and Motorola FCC designation number are all on a label attached to the back of your radio. From
this model number, you can determine the RF output po wer, frequency band, type of squelch, and number of channels. The table
below outlines one portable radio model number and its specific characteristics.

All GP350 radio models are synthesized, two or sixteen channel units that come standard with tone Private-Line (TPL) or Dig­ital Private-Line (DPL) coded squelch, which may be enabled / disabled on a per channel basis. Programming changes can be
made by your local Motorola Radius dealer.

Radio Model Number (Example: P94MGC20C2AA)

Type

of

Unit Tx Power Freq.

1-5 W VHF
1-4 W UHF

P = Portable

VHF

4

UHF

Model
Series

MGC

Universal

Channel
Spacing

12.5 kHz

20/25 kHz

Channel

Capability

2 Channels

16 Channels

Frequency

Sub-band Version

A

Low Split

2, 3 or 4

High Split

= Package Model with

Battery, Antenna, Belt Clip,

Unique

Model

Variation

A

Charger.

August, 1996 6880904Z07-O

xiii

Foreword GP350 Portable Radios Service Manual
Radio Service Software Information

Radio Service Software Information

To run the Radio Service Software, you will need the following equipment:

Required Equipment:

1. IBM XT, AT, Convertible, or System/2 Model 30/50TM with 512K RAM, Dual Floppy Disk Drives or on Floppy Disk
and one Hard Disk.

2. PCDOSTM or MSDOSTM 3.0 or later.

3. Radio Interface Box (RIB) HLN9214.

4. RIB to IBM AT cable HKN9216.

5. IBM AT cable to IBM XT computer adapter (optional) HLN9390.

6. Programming/Test cable (HKN9857).

7. Programming Hardware Kit (REX1143).

8. RIB power supply HSN9412 (110 VAC) or 0180358A56 (220 VAC).

9. Power Supply R1011A or equivalent.

RSS

GP350 Radio

Manual

HVN9128
Software

Power Supply (7.2 VDC)
Note: Battery can be used on

programming cable making
power supply optional.

HLN9214

HKN9857
Programming / test cable.

Plugs between the RIB and radio.

Figure 2. Equipment Setup

Computer

HKN9216
RIB to Computer Cable

Plugs into RIB and
computer.

(RIB)

HSN9412
RIB Power Supply.

Plug into 110 VAC
outlet

Configuring the RIB and Radio

1. Connect the RIB to the computer (Figure 2).

2. If your computer has an XT style communications port (25 pin connector), plug the HLN9390 adapter into the com­puter and plug the HKN9216 cable into the adapter. If you are unsure of which connection is on the back of your
computer or the COM port, then please consult the computer manuals.

3. Plug the large 25 pin end of the HKN programming cable into the RIB. The other end of this cable has a “battery
eliminator.”

4. Connect the two adapter plates (REX1143) to HKN9857 according to the instructions supplied with the Programming
Hardware Kit.

5. Slide the battery eliminator in place of the radio’s battery.

6. Plug the HSN9412 power supply into a wall outlet, and connect the other end to the RIB.

7. Connect the radio to a power supply and turn the volume control clockwise to turn it on.

xiv 6880904Z07-O August, 1996