Motorola GM300 User Manual

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Page 1

GM300

Mobile Radios

136-162 MHz 146-174 MHz 403-433 MHz 438-470 MHz 465-495 MHz

490-520 MHz

Service Manual

6880902Z32-A

Page 2

Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

How to Use This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Other Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Service Policy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Ordering Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Model Charts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv

Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv

SpeciÞcations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii

Section 1

Disassembly/Re-assembly

Radio Disassembly and Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

To Remove RF Chassis Shield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

To Remove the PA Heatsink. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

To Remove the RF Circuit Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

To Remove the Logic Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

To Remove the PA Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

To Re-Assemble the Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Board Replacement and Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Section 2

Theory of Operation

RF Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

VHF Receiver Front End, 146-174 MHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

UHF Receiver Front End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Receiver Back End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Frequency Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Charge Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Loop Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Reference Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

VCOÕs and Buffers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Logic Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

DC Distribution and Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Microcomputer and Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Microcomputer Start-Up Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Microcomputer Operation-Expanded Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Reading or Writing in Memory-Expanded Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Programmable I/OÕs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Receiver Audio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Voice Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Data Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Transmitter Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Voice Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

Data Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

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Table of Contents Name of Manual

Transmitter Power Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Control Line Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10

Power Control Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

RF Power AmpliÞers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

1-10 Watt VHF Power AmpliÞer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

10-25 Watt VHF Power AmpliÞer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

25-45 Watt VHF Power AmpliÞer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

1-10 Watt UHF Power AmpliÞer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

10-25 Watt UHF Power AmpliÞer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

25-35/40 Watt UHF Power AmpliÞers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

Front Panel Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Display Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Display Board (8/16 Freq Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Vol/Mic Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Front Panel Filter Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

Section 3

Jumper-Selectable Options

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Jumper Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Section 4

Non-Field Servicable Components

Operation of the Reference Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Non-Field Servicable Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Schematic Diagrams & Circuit Board Details

Schematic Diagram for HLD8265A and HLD88266A VHF RF Boards, 136-162 MHz . . . . . . . . . . . . . . . . . . . . . .1

Circuit Board Details for HLD8265A and HLD8266A VHF RF Boards, 136-162 MHz . . . . . . . . . . . . . . . . . . . . .2

Schematic Diagram for HLD8029A and HLD8031A VHF RF Boards, 146-174 MHz . . . . . . . . . . . . . . . . . . . . . . .3

Circuit Board Details for HLD8029A and HLD8031A VHF RF Boards, 146-174 MHz . . . . . . . . . . . . . . . . . . . . .4

Schematic Diagram for HLE8229A and HLE8230A UHF RF Boards, 403-433 MHz . . . . . . . . . . . . . . . . . . . . . . .5

Circuit Board Details for HLE8229A and HLE8230A UHF RF Boards, 403-433 MHz . . . . . . . . . . . . . . . . . . . . . .6

Schematic Diagram for HLE8300A and HLE8301A UHF RF Boards, 438-470 MHz . . . . . . . . . . . . . . . . . . . . . . .7

Circuit Board Details for HLE8300A and HLE8301A UHF RF Boards, 438-470 MHz . . . . . . . . . . . . . . . . . . . . . .8

Schematic Diagram for HLE8263A and HLE8264A UHF RF Boards, 465-490 MHz . . . . . . . . . . . . . . . . . . . . . . .9

Circuit Board Details for HLE8263A and HLE8264A UHF RF Boards, 465-490 MHz . . . . . . . . . . . . . . . . . . . . .10

Schematic Diagram for HLE8227A and HLE8228A UHF RF Boards, 490-520 MHz . . . . . . . . . . . . . . . . . . . . . .11

Circuit Board Details for HLE8227A and HLE8228A UHF RF Boards, 490-520 MHz . . . . . . . . . . . . . . . . . . . . .12

Schematic Diagram for HLE8074A Masked Logic Board (2-Layer) (Sheet 1 of 2) . . . . . . . . . . . . . . . . . . . . . . . .13

Schematic Diagram for HLE8074A Masked Logic Board (2-Layer) (Sheet 2 of 2) . . . . . . . . . . . . . . . . . . . . . . . .14

Circuit Board Details for HLN8074A Masked Logic Board (2-Layer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Schematic Diagram for HLN8070A Expanded Logic Board (4-Layer) (Sheet 1 of 2) . . . . . . . . . . . . . . . . . . . . . .16

Schematic Diagram for HLN8070A Expanded Logic Board (4-Layer) (Sheet 2 of 2) . . . . . . . . . . . . . . . . . . . . . .17

Circuit Board Details for HLN8070A Expanded Logic Board (4-Layer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Circuit Board Details and Schematic for HLD8293A

VHF Power Amplifier, 136-162 MHz, 10-25 Watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Circuit Board Details and Schematic For HLD8299A

VHF Power Amplifier, 146-174 MHz, 1-10 Watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Circuit Board Details and Schematic For HLD8033A

VHF Power Amplifier, 146-174 MHz, 10-25 Watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Circuit Board Details and Schematic for HLD8287A

VHF Power Amplifier, 146-174 MHz, 25-45 Watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

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Name of Manual Table of Contents

Circuit Board Details and Schematic for HLE8385A

UHF Power Amplifier, 403-433 MHz, 1-10 Watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Circuit Board Details and Schematic for HLE8275A

UHF Power Amplifier, 403-433 MHz, 25-40 Watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Circuit Board Details and Schematic for HLE8267A

UHF Power Amplifier, 438-470 MHz, 1-10 Watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Circuit Board Details and Schematic for HLE8034A

UHF Power Amplifier, 438-470 MHz, 10-25 Watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Circuit Board Details, and Schematic for HLE8271A

UHF Power Amplifier, 438-470 MHz, 25-40 Watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Circuit Board Details and Schematic for HLE8284A

UHF Power Amplifier, 465-495 MHz, 25-40 Watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Circuit Board Details and Schematic for HLE8269A

UHF Power Amplifier, 490-520 MHz, 25-35 Watts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Circuit Board Detail, Schematic and Parts List for Front Panel Filter Board (01-80704Y83) . . . . . . . . . . . . . . . .30

Schematic Diagram and Parts List for HLN8075A Display Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Circuit Board Details for HLN8075A Display Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Circuit Board Detail, Schematic and Parts List for HLN8071A Volume/Microphone Board . . . . . . . . . . . . . .33

Exploded View, Schematic, Circuit Board Detail and Parts List for Microphone . . . . . . . . . . . . . . . . . . . . . . . .34

Exploded Mechanical View and Parts List for Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Parts Lists for RF, Logic, & PA Boards

RF Boards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Logic Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PA Boards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

March, 1997 68 No.

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68 No. March, 1997

Page 6

lForeword

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 speciÞcations, as well as four sections that deal with speciÞc service aspects of the GM300. Refer to the Table of Contents for a general overview of the manual, or to the ÒOverviewÓ paragraph in each section for a speciÞc overview of the information in that section.

Technical Support

Radius Product Services Hwy. 34 West Mt. Pleasant, IA 52641 USA 1-800-356-1520 319-385-5395 (International)

Radius 30-Day Warranty

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

Table 1.

Information Location

Basic Use of GM300 GM300 OwnerÕs Manual (6880902Z09)

Programming GM300 RSS Basic Manual (6880902Z36)

GM300 RSS RapidCall Manual (6880902Z64)

Technical Support

To obtain technical support, you may call MotorolaÕs 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 iden-

Radius Major Component Repair

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

Motorola Parts

Worldwide System and Aftermarket Products Division Attention: Order Processing 1313 E. Algonquin Road Schaumburg, IL 60196

Worldwide System and Aftermarket Products Division Attention: International Order Processing 1313 E. Algonquin Road Schaumburg, IL 60196

Customer Service

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

Parts IdentiÞcation

1-708-538-0021 1-708-538-8194

March, 1997 68 No.

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Page 7

Foreword

Model Charts

DESCRIPTION

GM300 12.5 kHz

GM300 20/25/30 kHz

GM300 12.5 kHz

FREQ

GM300 20/25/30 kHz

VHF Mobile Radio

10 - 25 Watts RF Power

GM300

136 - 162 MHz

DESCRIPTION

RF Board 20/25/30 kHz

Logic Board Masked

RF Board 12.5 kHz

Logic Board, Expanded

Vol/Mic Board

Display Board 8/16 Frequency

Front Panel Hardware, 8/16 Freq

PA Board

PA Hardware

Chassis Hardware

MODEL

M33GMC00D1A

M33GMC20D1A

M33GMC09C1A

M33GMC29C1A

ITEM

HLD8266_

HLD8265_

HLN8070_

HLN8074_

HLN8071_

HLN8075_

HLN8072_

HLD8293_

Item Description

X HUD3834_ Chassis, 12.5 kHz (Masked) X X X

X HUD3833_ Chassis, 20/25/30 kHz (Masked) X X X

X HUD3832_ Chassis, 12.5 kHz (Expanded) X X X

X HUD3831_ Chassis, 20/25/30 kHz (Expanded) X X X XXXXHLD3850_ PA Kit (part of chassis) X X XXXXHCN3503_ Control Head, 8/16 Channel X X X X X HLN8122_ Front Panel Lens, 8 Channel

X X HLN8123_ Front Panel Lens, 16 Channel

X X HHN8073_ Housing Kit, masked

X X HHN8170_ Housing Kit, expanded

XXXXHLN8120_ Nameplate

X X HLN8121_ ROM Kit XXXXHKN4137_ Power Cable XXXXHMN3413_ Microphone w/hangup clip XXXXHLN5189_ Installation Kit XXXX6880902Z09 Owners Manual GM300 X X 6880902Z26 Operator Card 8 Channel

X X 6880902Z41 Operator Card 16 Channel

HLN8295_

HLN8076_

68 No. March, 1997

Page 8

Name of Manual Foreword

Model Charts

DESCRIPTION

GM300 12.5 kHz

GM300 20/25/30 kHz

GM300 12.5 kHz

GM300 20/25/30 kHz

GM300

DESCRIPTION

VHF Mobile Radio

FREQ

146 - 174 MHz

1 - 10 Watts RF Power

RF Board 20/25/30 kHz

RF Board 12.5 kHz

Display Board 8/16 Frequency

Logic Board Masked

Logic Board, Expanded

Vol/Mic Board

PA Board

Front Panel Hardware, 8/16 Freq

PA Hardware

Chassis Hardware

MODEL

M03GMC09C2A

M03GMC00D2A

M03GMC20D2A

M03GMC29C2A

ITEM

HLD8029_

HLD8031_

HLN8070_

HLN8074_

HLN8071_

HLN8075_

HLN8072_

HLD8299_

Item Description

X HUD3794_ Chassis, 12.5 kHz (Masked) X X X

X HUD3792_ Chassis, 20/25/30 kHz (Masked) X X X

X HUD3793_ Chassis, 12.5 kHz (Expanded) X X X

X HUD3791_ Chassis, 20/25/30 kHz (Expanded) X X X XXXXHLD3852_ PA Kit (part of chassis) X X XXXXHCN3503_ Control Head, 8/16 Channel X X X X X HLN8122_ Panel Lens 8 Channel

X X HLN8123_ Panel Lens 16 Channel

X X HHN8073_ Housing Kit, masked

X X HHN8170_ Housing Kit, expanded

XXXXHLN8120_ Nameplate

X X HLN8121_ ROM Kit XXXXHKN4137_ Power Cable XXXXHMN3413_ Microphone w/hangup clip XXXXHLN5189_ Installation Kit XXXX6880902Z09 Owners Manual GM300 X X 6880902Z26 Operator Card 8 Channel

X X 6880902Z41 Operator Card 16 Channel

HLN8274_

HLN8076_

March, 1997 68 No.

Page 9

Foreword Name of Manual

Model Charts

DESCRIPTION

GM300 12.5 kHz

GM300 20/25/30 kHz

GM300 12.5 kHz

GM300 20/25/30 kHz

GM300

DESCRIPTION

VHF Mobile Radio

FREQ

146 - 174 MHz

10 - 25 Watts RF Power

RF Board 20/25/30 kHz

RF Board 12.5 kHz

Display Board 8/16 Frequency

Logic Board Masked

Logic Board, Expanded

Vol/Mic Board

PA Board

Front Panel Hardware, 8/16 Freq

PA Hardware

Chassis Hardware

MODEL

M33GMC00D2A

M33GMC20D2A

M33GMC09C2A

M33GMC29C2A

ITEM

HLD8029_

HLD8031_

HLN8070_

HLN8074_

HLN8071_

HLN8075_

HLN8072_

HLD8033_

Item Description

X HUD3409_ Chassis, 12.5 kHz (Masked) X X X

X HUD3410_ Chassis, 20/25/30 kHz (Masked) X X X

X HUD3570_ Chassis, 12.5 kHz (Expanded) X X X

X HUD3571_ Chassis, 20/25/30 kHz (Expanded) X X X XXXXHLD3502_ PA Kit (part of chassis) X X XXXXHCN3503_ Control Head, 8/16 Channel X X X X X HLN8122_ Front Panel Lens, 8 Channel

X X HLN8123_ Front Panel Lens, 16 Channel

X X HHN8073_ Housing Kit, masked

X X HHN8170_ Housing Kit, expanded

XXXXHLN8120_ Nameplate

X X HLN8121_ ROM Kit XXXXHKN4137_ Power Cable XXXXHMN3413_ Microphone w/hangup clip XXXXHLN5189_ Installation Kit XXXX6880902Z09 Owners Manual GM300 X X 6880902Z26 Operator Card 8 Channel

X X 6880902Z41 Operator Card 16 Channel

HLN8069_

HLN8076_

68 No. March, 1997

Page 10

Name of Manual Foreword

Model Charts

DESCRIPTION

GM300 12.5 kHz

GM300 20/25/30 kHz

GM300 12.5 kHz

GM300 20/25/30 kHz

GM300

DESCRIPTION

VHF Mobile Radio

FREQ

146 - 174 MHz

25 - 45 Watts RF Power

RF Board 20/25/30 kHz

RF Board 12.5 kHz

Logic Board Masked

Logic Board, Expanded

Vol/Mic Board

Display Board 8/16 Frequency

Front Panel Hardware, 8/16 Freq

PA Board

PA Hardware

Chassis Hardware

MODEL

M43GMC00D2A

M43GMC20D2A

M43GMC09C2A

M43GMR29C2A

M43GMC29C2A

ITEM

HLD8029_

HLD8031_

HLD9002_

HLN8074_

HLN8071_

HLN8070_

HLN8075_

HLN8072_

HLD8287_

Item Description

X HUD3931_ Chassis, 12.5 kHz (Masked) X X X

X HUD3790_ Chassis, 20/25/30 kHz (Masked) X X X

X HUD3930_ Chassis, 12.5 kHz (Expanded) X X X

X HUD3823_ Chassis, 20/25/30 kHz (Expanded) X X X

X HUD3123_ Chassis, 20/25/30 kHz (Expanded) X X X XXXXXHLD3848_ PA Kit (part of chassis) X X XXXXXHCN3503_ Control Head, 8/16 Channel X X X X X HLN8122_ Front Panel Lens, 8 Channel

X X X HLN8123_ Front Panel Lens, 16 Channel

X X HHN8073_ Housing Kit, masked

X X X HHN8170_ Housing Kit, expanded

XXXXXHLN8120_ Nameplate

X X X HLN8121_ ROM Kit XXXXXHKN4137_ Power Cable XXXXXHMN3413_ Microphone w/hangup clip XXXXXHLN5189_ Installation Kit XXXXX6880902Z09 Owners Manual GM300 X X 6880902Z26 Operator Card 8 Channel

X X X 6880902Z41 Operator Card 16 Channel

HLN8289_

HLN8076_

March, 1997 68 No.

vii

Page 11

Foreword Name of Manual

Model Charts

DESCRIPTION

GM300 12.5 kHz

GM300 20/25 kHz

GM300 12.5 kHz

GM300 20/25 kHz

GM300

DESCRIPTION

UHF Mobile Radio

FREQ

403 - 433 MHz

1 - 10 Watts RF Power

RF Board 20/25 kHz

RF Board 12.5 kHz

Display Board 8/16 Frequency

Logic Board Masked

Logic Board, Expanded

Vol/Mic Board

PA Board

Front Panel Hardware, 8/16 Freq

PA Hardware

Chassis Hardware

MODEL

M04GMC00D1A

M04GMC20D1A

M04GMC09C1A

M04GMC29C1A

ITEM

HLE8301_

HLE8300_

HLN8070_

HLN8074_

HLN8071_

HLN8075_

HLN8072_

HLE8385_

Item Description

X HUE3944_ Chassis, 12.5 kHz (Masked) X X X

X HUE3945_ Chassis, 20/25 kHz (Masked) X X X

X HUE3946_ Chassis, 12.5 kHz (Expanded) X X X

X HUE3947_ Chassis, 20/25 kHz (Expanded) X X X XXXXHLE3929_ PA Kit (part of chassis) X X XXXXHCN3503_ Control Head, 8/16 Channel X X X X X HLN8122_ Front Panel Lens, 8 Channel

X X HLN8123_ Front Panel Lens, 16 Channel

X X HHN8073_ Housing Kit, masked

X X HHN8170_ Housing Kit, expanded

XXXXHLN8120_ Nameplate

X X HLN8121_ ROM Kit XXXXHKN4137_ Power Cable XXXXHMN3413_ Microphone w/hangup clip XXXXHLN5189_ Installation Kit XXXX6880902Z09 Owners Manual GM300 X X 6880902Z26 Operator Card 8 Channel

X X 6880902Z41 Operator Card 16 Channel

HLN8386_

HLN8076_

viii

68 No. March, 1997

Page 12

Name of Manual Foreword

Model Charts

DESCRIPTION

GM300 12.5 kHz

GM300 20/25 kHz

GM300 12.5 kHz

GM300 20/25 kHz

GM300

DESCRIPTION

UHF Mobile Radio

FREQ

403 - 433 MHz

25 - 40 Watts RF Power

RF Board 20/25 kHz

RF Board 12.5 kHz

Display Board 8/16 Frequency

Logic Board Masked

Logic Board, Expanded

Vol/Mic Board

PA Board

Front Panel Hardware, 8/16 Freq

PA Hardware

Chassis Hardware

MODEL

M44GMC00D1A

M44GMC20D1A

M44GMC09C1A

M44GMC29C1A

ITEM

HLE8230_

HLE8229_

HLN8070_

HLN8074_

HLN8071_

HLN8075_

HLN8072_

HLE8275_

Item Description

X HUE3812_ Chassis, 12.5 kHz (Masked) X X X

X HUE3811_ Chassis, 20/25 kHz (Masked) X X X

X HUE3810_ Chassis, 12.5 kHz (Expanded) X X X

X HUE3809_ Chassis, 20/25 kHz (Expanded) X X X XXXXHLE3853_ PA Kit (part of chassis) X X XXXXHCN3503_ Control Head, 8/16 Channel X X X X X HLN8122_ Front Panel Lens, 8 Channel

X X HLN8123_ Front Panel Lens, 16 Channel

X X HHN8073_ Housing Kit, masked

X X HHN8170_ Housing Kit, expanded

XXXXHLN8120_ Nameplate

X X HLN8121_ ROM Kit XXXXHKN4137_ Power Cable XXXXHMN3413_ Microphone w/hangup clip XXXXHLN5189_ Installation Kit XXXX6880902Z09 Owners Manual GM300 X X 6880902Z26 Operator Card 8 Channel

X X 6880902Z41 Operator Card 16 Channel

HLN8277_

HLN8076_

March, 1997 68 No. ix

Page 13

Foreword Name of Manual

Model Charts

DESCRIPTION

GM300 12.5 kHz

GM300 20/25 kHz

GM300 12.5 kHz

GM300 20/25 kHz

GM300

DESCRIPTION

UHF Mobile Radio

FREQ

438 - 470 MHz

1 - 10 Watts RF Power

RF Board 20/25 kHz

RF Board 12.5 kHz

Display Board 8/16 Frequency

Logic Board Masked

Logic Board, Expanded

Vol/Mic Board

PA Board

Front Panel Hardware, 8/16 Freq

PA Hardware

Chassis Hardware

MODEL

M04GMC00D3A

M04GMC20D3A

M04GMC09C3A

M04GMC29C3A

ITEM

HLE8301_

HLE8300_

HLN8070_

HLN8074_

HLN8071_

HLN8075_

HLN8072_

HLE8267_

Item Description

X HUE3816_ Chassis, 12.5 kHz (Masked) X X X

X HUE3815_ Chassis, 20/25 kHz (Masked) X X X

X HUE3814_ Chassis, 12.5 kHz (Expanded) X X X

X HUE3813_ Chassis, 20/25 kHz (Expanded) X X X XXXXHLE3770_ PA Kit (part of chassis) X X XXXXHCN3503_ Control Head, 8/16 Channel X X X X X HLN8122_ Front Panel Lens, 8 Channel

X X HLN8123_ Front Panel Lens, 16 Channel

X X HHN8073_ Housing Kit, masked

X X HHN8170_ Housing Kit, expanded

XXXXHLN8120_ Nameplate

X X HLN8121_ ROM Kit XXXXHKN4137_ Power Cable XXXXHMN3413_ Microphone w/hangup clip XXXXHLN5189_ Installation Kit XXXX6880902Z09 Owners Manual GM300 X X 6880902Z26 Operator Card 8 Channel

X X 6880902Z41 Operator Card 16 Channel

HLN8268_

HLN8076_

x 68 No. March, 1997

Page 14

Name of Manual Foreword

Model Charts

DESCRIPTION

GM300 12.5 kHz

GM300 20/25 kHz

GM300 12.5 kHz

GM300 20/25 kHz

GM300

DESCRIPTION

UHF Mobile Radio

FREQ

438 - 470 MHz

10 - 25 Watts RF Power

RF Board 20/25 kHz

RF Board 12.5 kHz

Display Board 8/16 Frequency

Logic Board Masked

Logic Board, Expanded

Vol/Mic Board

PA Board

Front Panel Hardware, 8/16 Freq

PA Hardware

Chassis Hardware

MODEL

M34GMC00D3A

M34GMC20D3A

M34GMC09C3A

M34GMC29C3A

ITEM

HLE8301_

HLE8300_

HLN8070_

HLN8074_

HLN8071_

HLN8075_

HLN8072_

HLE8034_

Item Description

X HUE3820_ Chassis, 12.5 kHz (Masked) X X X

X HUE3819_ Chassis, 20/25 kHz (Masked) X X X

X HUE3818_ Chassis, 12.5 kHz (Expanded) X X X

X HUE3817_ Chassis, 20/25 kHz (Expanded) X X X XXXXHLE3501_ PA Kit (part of chassis) X X XXXXHCN3503_ Control Head, 8/16 Channel X X X X X HLN8122_ Front Panel Lens, 8 Channel

X X HLN8123_ Front Panel Lens, 16 Channel

X X HHN8073_ Housing Kit, masked

X X HHN8170_ Housing Kit, expanded

XXXXHLN8120_ Nameplate

X X HLN8121_ ROM Kit XXXXHKN4137_ Power Cable XXXXHMN3413_ Microphone w/hangup clip XXXXHLN5189_ Installation Kit XXXX6880902Z09 Owners Manual GM300 X X 6880902Z26 Operator Card 8 Channel

X X 6880902Z41 Operator Card 16 Channel

HLN8068_

HLN8076_

March, 1997 68 No. xi

Page 15

Foreword Name of Manual

Model Charts

DESCRIPTION

GM300 12.5 kHz

GM300 20/25 kHz

GM300 12.5 kHz

GM300 20/25 kHz

GM300

DESCRIPTION

UHF Mobile Radio

FREQ

438 - 470 MHz

25 - 40 Watts RF Power

RF Board 20/25 kHz

RF Board 12.5 kHz

Display Board 8/16 Frequency

Logic Board Masked

Logic Board, Expanded

Vol/Mic Board

PA Board

Front Panel Hardware, 8/16 Freq

PA Hardware

Chassis Hardware

MODEL

M44GMC00D3A

M44GMC20D3A

M44GMC09C3A

M44GMC29C3A

ITEM

HLE8301_

HLE8300_

HLN8070_

HLN8074_

HLN8071_

HLN8075_

HLN8072_

HLE8271_

Item Description

X HUE3918_ Chassis, 12.5 kHz (Masked) X X X

X HUE3822_ Chassis, 20/25 kHz (Masked) X X X

X HUE3917_ Chassis, 12.5 kHz (Expanded) X X X

X HUE3821_ Chassis, 20/25 kHz (Expanded) X X X XXXXHLE3772_ PA Kit (part of chassis) X X XXXXHCN3503_ Control Head, 8/16 Channel X X X X X HLN8122_ Front Panel Lens, 8 Channel

X X HLN8123_ Front Panel Lens, 16 Channel

X X HHN8073_ Housing Kit, masked

X X HHN8170_ Housing Kit, expanded

XXXXHLN8120_ Nameplate

X X HLN8121_ ROM Kit XXXXHKN4137_ Power Cable XXXXHMN3413_ Microphone w/hangup clip XXXXHLN5189_ Installation Kit XXXX6880902Z09 Owners Manual GM300 X X 6880902Z26 Operator Card 8 Channel

X X 6880902Z41 Operator Card 16 Channel

HLN8272_

HLN8076_

xii 68 No. March, 1997

Page 16

Name of Manual Foreword

Model Charts

DESCRIPTION

GM300 12.5 kHz

GM300 20/25 kHz

GM300 12.5 kHz

GM300 20/25 kHz

GM300

DESCRIPTION

UHF Mobile Radio

FREQ

465 - 495 MHz

25 - 40 Watts RF Power

RF Board 20/25 kHz

RF Board 12.5 kHz

Display Board 8/16 Frequency

Logic Board Masked

Logic Board, Expanded

Vol/Mic Board

PA Board

Front Panel Hardware, 8/16 Freq

PA Hardware

Chassis Hardware

MODEL

M44GMC00D4A

M44GMC20D4A

M44GMC09C4A

M44GMC29C4A

ITEM

HLE8264_

HLE8263_

HLN8070_

HLN8074_

HLN8071_

HLN8075_

HLN8072_

HLE8284_

Item Description

X HUE3842_ Chassis, 12.5 kHz (Masked) X X X

X HUE3841_ Chassis, 20/25 kHz (Masked) X X X

X HUE3840_ Chassis, 12.5 kHz (Expanded) X X X

X HUE3839_ Chassis, 20/25 kHz (Expanded) X X X XXXXHLE3847_ PA Kit (part of chassis) X X XXXXHCN3503_ Control Head, 8/16 Channel X X X X X HLN8122_ Front Panel Lens, 8 Channel

X X HLN8123_ Front Panel Lens, 16 Channel

X X HHN8073_ Housing Kit, masked

X X HHN8170_ Housing Kit, expanded

XXXXHLN8120_ Nameplate

X X HLN8121_ ROM Kit XXXXHKN4137_ Power Cable XXXXHMN3413_ Microphone w/hangup clip XXXXHLN5189_ Installation Kit XXXX6880902Z09 Owners Manual GM300 X X 6880902Z26 Operator Card 8 Channel

X X 6880902Z41 Operator Card 16 Channel

HLN8286_

HLN8076_

March, 1997 68 No. xiii

Page 17

Foreword Name of Manual

Model Charts

DESCRIPTION

GM300 12.5 kHz

GM300 20/25 kHz

GM300 12.5 kHz

GM300 20/25 kHz

GM300

DESCRIPTION

UHF Mobile Radio

FREQ

490 - 520 MHz

25 - 35 Watts RF Power

RF Board 20/25 kHz

RF Board 12.5 kHz

Display Board 8/16 Frequency

Logic Board Masked

Logic Board, Expanded

Vol/Mic Board

PA Board

Front Panel Hardware, 8/16 Freq

PA Hardware

Chassis Hardware

MODEL

M44GMC00D5A

M44GMC20D5A

M44GMC09C5A

M44GMC29C5A

ITEM

HLE8228_

HLE8227_

HLN8070_

HLN8074_

HLN8071_

HLN8075_

HLN8072_

HLE8269_

Item Description

X HUE3838_ Chassis, 12.5 kHz (Masked) X X X

X HUE3837_ Chassis, 20/25 kHz (Masked) X X X

X HUE3836_ Chassis, 12.5 kHz (Expanded) X X X

X HUE3835_ Chassis, 20/25 kHz (Expanded) X X X XXXXHLE3771_ PA Kit (part of chassis) X X XXXXHCN3503_ Control Head, 8/16 Channel X X X X X HLN8122_ Front Panel Lens, 8 Channel

X X HLN8123_ Front Panel Lens, 16 Channel

X X HHN8073_ Housing Kit, masked

X X HHN8170_ Housing Kit, expanded

XXXXHLN8120_ Nameplate

X X HLN8121_ ROM Kit XXXXHKN4137_ Power Cable XXXXHMN3413_ Microphone w/hangup clip XXXXHLN5189_ Installation Kit XXXX6880902Z09 Owners Manual GM300 X X 6880902Z26 Operator Card 8 Channel

X X 6880902Z41 Operator Card 16 Channel

HLN8270_

HLN8076_

xiv 68 No. March, 1997

Page 18

Name of Manual Foreword

Accessories

Radius offers many accessories to increase communications efÞciency. Some of the accessories available are listed below. For a complete list, consult your Radius dealer.

Antennas:

HAD4007_R VHF 146-150.8 MHz, 1/4 wave roof mount

HAD4008_R VHF 150.8-162 MHz, 1/4 wave roof mount HAD4009_R VHF 162-174 MHz, 1/4 wave roof mount HAD4014_R VHF 146-172 MHz, 3db gain roof mount HAE4003_R UHF 450-470 MHz, 1/4 wave roof mount HAE4011_R UHF 450-470 MHz, 3.5 db gain roof mount HAE4019_R UHF 450-470 MHz, 5 db gain roof mount HAE4002_R UHF 403-430 MHz, 1/4 wave roof mount HAE4010_R UHF 406-420 MHz, 3.5 db gain roof mount HAE4004_R UHF 470-512 MHz, 1/4 wave roof mount HAE4012_R UHF 470-494 MHz, 3.5 db gain roof mount HAE4013_R UHF 494-512 MHz, 5 db gain roof mount

Installation Accessories:

HLN9284_R Key lock mount

HLN5189_R Non-locking bracket HLN5226_R Extra stability mount (use with HLN5189) HLN9450_R 45 - 60 degree ßoor mount wedge (requires HLN9404) HLN9404_R Sleeve mounting bracket HKN4137_R Power cable w/ 15 Amp fuse HLN5282_R Mini-UHF connector HKN9557_R PL259/Mini-UHF antenna adapter - 8 inch cable HLN8027_R Mini-UHF to BNC antenna adapter HLN8097_R Removable slide mount tray package HLN8098_R Radio slide mount tray HLN8099_R Vehicle slide mount tray HLN8413_ Slidemount tray bracket HLN8143_R Remote mount kit (17 foot length) HLN8144_R Remote mount kit (8 foot length) HLN9027_ In-Dash mounting kit

Control Station Accessories:

HMN1038_R Desk Microphone

HMN3000_ Desk Microphone (black) HPN1007_R Power supply, 117 Vac (for 25 Watt or less radio models only) HPN4001_R Power supply and cables, 117 Vac (for any radio model up to 45 Watts) HKN4139_R Low power control station power cable (for HPN1007_R) HKN9455_R High power control station power cable (for HPN4001_R)

Microphones:

HMN3596_R Compact Microphone with 7 foot cord

HMN1035_R Heavy Duty Palm Microphone with 10.5 foot cord HMN1037_R Touch-code Microphone with hang-up clip TDN8305_R Touch-code Microphone with backlit keypad & hang-up clip TMN6169_R Touch-code Microphone with memory dial, backlit keypad & hang-up clip HMN3141_R Handset with hang-up cup HLN9559_R 7 foot coil cord Heavy Duty Microphones HLN9560_R 10.5 foot extended coil cord for Heavy Duty Microphones HLN9073_R Microphone hang-up clip (all microphones)

1. Convertible to 230 Vac by changing internal switch and modifying the power cord.

March, 1997 68 No. xv

Page 19

Foreword Name of Manual

Accessories

Accessories / Kits Interfacing with the 16 Pin Connector:

HKN9327_R Ignition switch cable

HSN8145_R 7.5 Watt external speaker - for receiver audio HLN9457_R Hardware kit-includes 16 connector pins, (9) 8Ó wires with pins & extra housing HLN9328_R Horn/Lights relay and cable (external alarm) HLN9329_R Emergency pushbutton switch and cable HLN9330_R Emergency footswitch and cable HLN8375_R DTMF Decoder board (mounts inside radio - soldering required) HLN3145_R Public Address kit

HLN3333_ Repeater Interface kit TDN8300_ DC Remote Adapter - 2 channel operation (requires at least one L1662 deskset) TDN8301_ Tone Remote Adapter - 2 channel operation (requires at least one L1663 deskset) L1661 C100 Extended Local Deskset TDN8196 i50X Low Tier Radio-Telephone Interconnect and cable TDN7891 i150X Mid Tier Radio-Telephone Interconnect and cable TDN7892 i250X High Tier Radio-Telephone Interconnect and cable HLN9573_R Shorting Plug - Þlls microphone jack when no microphone is being used

Manuals:

6880902Z26 OperatorÕs card - GM300 8 channel radios

6880902Z41 OperatorÕs card - GM300 16 channel radios 6880902Z09 OwnerÕs manual - GM300 6880902Z32 Service manual - GM300

2. The Public Address kit allows from one to ﬁve HSN1000_ ampliﬁed speakers. A minimum of one HSN1000_ speaker is required. One HKN9323_R (8 foot) cable or one HKN9324_R (15 foot) cable is required for each HSN1000_ speaker.

xvi 68 No. March, 1997

Page 20

Name of Manual Foreword

Specifications

Speciﬁcations

GENERAL

VHF UHF

Model Series: M03GMC M33GMC M33GMC M43GMC M43GMR M04GMC M34GMC M44GMC M44GMC M44GMC M44GMC

Frequency Range: 146-174 MHz 136-162 MHz 146-174 MHz 403-433 MHz 438-470 MHz 438-470 MHz 403-433 MHz 438-470 MHz 465-495 MHz 490-520 MHz

RF Output: 1-10 W* 10-25 W* 45 W 25-45 W 1-10 W* 10-25 W* 25/40 W 25-40 W* 25/40 W 25/35 W

Channel Capacity: 8 or 16

Frequency Separation: 28 MHz 32 MHz 32 MHz 30 MHz 32 MHz 30 MHz

Primary Input Voltage EIA: CEPT 84:

FCC Designation: ABZ99FT3032 ?? ABZ99FT3030 ABZ99FT3033 ?? ?? ABZ99FT4033 ABZ99FT4030 ABZ99FT4032 ABZ99FT4034 Pending Pending

Typical Current Drain Rated Audio (7.5 W): 1.5A

Transmit: 4.0A ?? 7.0A 15.0A ?? ?? 4.0A 7.5A 12.5A

Standby: 400 mA

Squelch Capability: Tone Coded, Digital Coded and/or Carrier Squelch

Dimensions: 2Ó x 7Ó x 7.75Ó (50.8 x 178 x 198 mm)

Weight: 61 z. (1.7 kg)

*Continuously variable power

TRANSMITTER

VHF UHF

Frequency Stability (-30ûC to +60ûC):

Spurs/Harmonics 1 to 25 W: >25 W: Exceptions:

Audio Response: (From a 6 dB/Oct. Pre-Emphasis 300-3000 Hz, 2550 Hz @ 12.5 kHz) +1 / -3 dB

Audio Distrotion: (@ 1000 Hz, 60% of Rated Max. Deviation) <3% EIA

FCC Modulation @20/25/30 kHz: @12.5 kHz:

Output Impedance: 50 ohms

Modulation Sensitivity: 80 mV for 60% max. deviation at 1000 Hz

Channel Spacing: 20/25/30 kHz 12.5 kHz 20/25/30 kHz 12.5 kHz

FM Noise EIA: CEPT 84:

45 dB 55 dB

.00025%

(50 µ

40 dB 50 dB

-36 dBm (0.25

-13 dBm

(403-433 MHz)/-36 dBm (0.25

16KOF1D, 16KOF2D, 16KOF3E, 11KOF1D, 11KOF2D, 11KOF3E

40 dB 50 dB

35 dB 45 dB

OPTIONAL SIGNALLING FEATURES WITH RAPIDCALL PACKAGE

Available in 16-Channel Models Only

Signalling Format: encode/decode PTT ID Call Alert

MDC-1200: XXXXX

Quick-Call II: X X

DTMF: X X X

Start (encode only): X X

Also includes Singletone Repeater Access & DTMF - ANI for Phone Access & Select V Signalling.

Voice

SelCall Emergency

Radio Check

10%

13.8

13.2 ±

20%

MILITARY STANDARDS 810 C, D, & E

810C 810D 810E

Applicable MIL-STD Methods Procedures Methods Procedures Methods Procedures

Low Pressure: 500.1 1 500.2 1 500.3 1

High Temperature: 501.1 1, 2 501.2 1, 2 501.3 1, 2

Low Temperature: 502.1 1 502.2 1, 2 502.3 1, 2

Temperature Shock: 503.1 1 503.2 1 503.3 1

Solar Radiation: 505.1 1 505.2 1 505.3 1

Rain: 506.1 2 506.2 2 506.3 2

Humidity: 507.1 2 507.2 2 507.3 2

Salt Fog: 509.1 1 509.2 1 509.3 1

Dust: 510.1 1 510.2 1 510.3 1

Vibration: 514.2 8, 10 514.3 1 514.4 1

Shock: 516.2 1, 3, 5 516.3 1, 5 516.4 1, 5

RECEIVER

VHF UHF

Channel Spacing: 12.5 kHz 20/25/30 kHz 12.5 kHz 20/25 kHz

Sensitivity EIA: 12 dB SINAD: CEPT 84: 20 dB SINAD:

Squelch: 10 dB SINAD

Selectivity EIA: CEPT 84:

Intermodulation* EIA: CEPT 84:

Frequency Stability: (-30ûC to +60ûC)

Spur Rejection EIA: CEPT 84:

Image Rejection EIA: CEPT 84:

Audio Output: External Speaker (8 EIA (@ <5% Dist): CEPT 84 (@ <10% Dist.): Internal Speaker:

EIA Usable Bandwidth: 1.2 kHz 20. kHz 1.2 kHz 2.0 kHz

Input Impedance: 50

* Local mode provides an additional 10 dB protection against wideband interference.

Ω

)

0.35

0.45

-70 dB

-73 dB

-80 dB

-75 dB

-80 dB

0.30

0.40

-80 dB

-78 dB

-73 dB

µ µ

V V

.00025%

7.5 W

5.0 W

3.0 W Nominal

Ω

0.35

0.45

-65 dB

-70 dB

-75 dB

-70 dB

-75 dB

0.30

0.40

-75 dB

-70 dB

µ µ

V V

March, 1997 68 No. xvii

Page 21

Foreword Name of Manual

Specifications

xviii 68 No. March, 1997

Page 22

Figure 1-2.

COAX CABLES

Figure 1-3.

Radio Disassembly and Assembly

To Remove Control Head & Chassis Covers

1. Remove control head mounting screws (Figure 1-1).

2. Pull control head off and away from the radio.

3. Carefully remove control head connectors from chassis.

4. Remove the two chassis cover screws from each side (Figure 1-1).

Radio Disassembly / Re-assembly

Section 1

Disassembly/Re-assembly

5. Remove top and bottom covers from chassis.

COVER

SCREWS

TOP COVER

CONTROL HEAD MOUNTING SCREWS

CONTROL HEAD

Figure 1-1.

COVER

SCREWS

To Remove RF Chassis Shield

Remove RF chassis shield by prying each of the four corners at the indentations provided (Figure 1-2). Be careful not to over bend any one corner.

3. Remove the heatsink mounting screws (Figure 1-4).

4. Pull heatsink off of chassis while carefully feeding the transmit and receive coax cables through their respective holes in the chassis.

To Remove the PA Heatsink

1. Disconnect the transmit and receive coaxial cables from the RF board (Figure 1-3).

2. Disconnect the 6-pin connector from the logic board (Figure 1-4).

March, 1997 68 No.

To Remove the RF Circuit Boards

1. After the PA heatsink has been removed, pry off the RF shield (Figure 1-5). Be careful not to over bend any one corner or side.

1-1

Page 23

Disassembly/Re-assembly Name of Manual

Radio Disassembly and Assembly

HEATSINK MOUNTING SCREWS

6-PIN CONNECTOR

Figure 1-4.

2. After removing the RF shield, remove all RF board mounting screws and take out the RF board (Figure 1-5).

RF BOARD

MOUNTING SCREWS

LOGIC BOARD MOUNTING SCREWS

FILTER BOARD

Figure 1-6.

FILTER BOARD SCREWS

RF SHIELD

Figure 1-5.

To Remove the Logic Circuit Board

1. After the RF board has been removed, turn the radio over and pry off the logic shield, again being careful not to bend any one corner or side.

2. Remove all logic board mounting screws (Figure 1-6).

3. Remove the two Þlter board screws from the front of the chassis (Figure 1-6). The logic and Þlter boards can now be lifted out of the chassis.

To Remove the PA Circuit Board

1. Remove the power ampliÞer shield by carefully prying each corner and side until you can slide the shield off easily (Figure 1-7).

Figure 1-7.

3. Unsolder the A+ power connector feed-thru leads and the antenna connector lead (Figure 1-9).

4. UHF ONLY - Remove the stud mount transistor mounting nut from the back of the heatsink (Figure 1-8).

5. Remove two power device mounting screws and all PA board mounting screws (Figure 1-9), and then take out the PA board.

To Re-Assemble the Radio

2. Remove the shield completely by guiding the coaxial cables out.

1-2

Reverse the disassembly procedure and tighten all screws to the torques speciÞed in Table 1-1.

68 No. March, 1997

Page 24

Figure 1-9.

Name of Manual Disassembly/Re-assembly

Radio Disassembly and Assembly

Figure 1-8.

Table 1-1. Fasteners, Tools and Torques

Part Number Description Location Qty Drv Input Torq. Repair Torq.

03-10945A11 M3 x 8 Plastite

Slt Torx¨ Pan Hd.

03-80270L01 M4 x 0.7 x 38 Mach.

Control Head Board and

9 T10 8 in.-lbs. 8 in.-lbs.

Internal Speaker Control Head Mount 2 T15 8 in.-lbs. 8 in.-lbs.

Torx¨ Cap Scr Blk

03-80271L01 M4 x 0.7 x 27 Mach.

Heatsink Mount 2 T15 12-14 in.-lbs. 12-14 in.-lbs.

Slt Torx¨ Pan Hd Blk

03-10943M04 M2.5 x 8 Taptite

Slt Torx¨ Pan Hd

03-10943M09 M3 x 6 Taptite

Slt Torx¨ Pan Hd

03-10943M10 M3 x 8 Taptite

Slt Torx¨ Pan Hd

Logic Heatsink Device Mount

RF Board Mount Logic Board Mount Chassis Feedthru Plt Front Panel Filter Board

PA Device/Board Mount Logic Heatsink to Chas-

2 T8 6-8 in.-lbs. 4-6 in.-lbs.

T10 8-10 in.-lbs. 6-8 in.-lbs. 6 2 2

T10 11-13 in.-lbs. 8-10 in.-lbs. 2

sis

03-10943M11 M3 x 10 Taptite

Slt Torx¨ Pan Hd

03-10943R55 M3 x 8 Taptite

Power Connector

T10 9-11 in.-lbs. 7-9 in.-lbs.

Device to Logic Heatsink22 Chassis Covers 4 T10 8-10 in.-lbs. 6-8 in.-lbs.

Torx¨ Flt Hd Blk

02-00007003 Hex Nut 8-32 PA - Stud Device Mount 1 5/16Ó

5 in.-lbs. 5 in.-lbs.

Hex

04-00136334 Flat Washer Device to Logic Heatsink

Power Connector

04-80943V01 Washer-Lock

Antenna Connector 1 -- -- --

2 2

------

3/8 Ext., Stl. Zinc

09-80131M01 3/8 Nut Antenna Connector 1 3/8Ó

18-20 in.-lbs. 18-20 in.-lbs

Hex

38-80041M01 Plug, button Heatsink Plug 1 -- -- --

03-11994A23 5-20 x 7/8Ó Plastite

Phl Pan Hd

Mic. Rear Housing to Front Housing

3 1 9-11 in.-lbs. 9-11 in.-lbs.

March, 1997 68 No.

1-3

Page 25

Disassembly/Re-assembly Name of Manual

Alignment

The advanced design and manufacturing procedures eliminate the need for traditional tuning tasks.

All the circuits in the GM300 radio have been aligned at the factory with specialized equipment.

Alignment in the Þeld should not be attempted or necessary.

Programming

The GM300 radios can be programmed in the Þeld to these parameters:

¥ Receive and transmit frequencies

¥ Transmit Frequency Adjustment (warp)

¥ PL or DPL encode and decode Codes

¥ Transmit Power Output

¥ Transmit Deviation

¥ Time Out Timer

ConÞguration information for programming these parameters is contained in the GM300 RADIO SERVICE SOFTWARE package HVN8177 Version B04.03.00 (or later versions )for 5.25 inch drives and 3.5 inch drive diskettes must be used.

A personal computer (P.C.) and the appropriate software diskette will be required in addition to the items listed in Recommended Test Equipment.

We strongly suggest the servicer become familiar with the programming techniques applicable to the GM300 radios.

Recommended T est Equipment

R2001D: Communication Systems Analyzer

R2200B: Service Monitor

R1011B: Power Supply

R1037A: Digital Multimeter

R1024B: Digital Multimeter

Board Replacement and Calibration

Replacement of the Logic board, RF board, or Power AmpliÞer requires that recalibration must be performed with the Motorola Radio Service Software. The

procedures for calibration are covered in the GM300 Radio Service Software Manual.

Failure to perform the required calibration procedure will affect the performance of the Reference Oscillator, RF Power Leveling and Protection, and Transmitter Modulation over frequency and temperature. An uncalibrated radio may not comply with your Local Communications Agency rules and may be unreliable at temperature extremes.

The GM300 radio was designed to be serviced at the board level only. There are a number of non-Þeld serviceable parts in the radio. Field replacement of these parts will affect the factory calibrated numbers on the tuning label. If any of these parts fail, board replacement is the only way to service the radio.

Table 1-2. Error Tones

Tone Problem

1. High pitch Beep (900Hz 119ms) on initial turn on or when key is pressed.

2. Low pitched tone (163Hz) for 5 seconds following turn on.

3. Low frequency (163Hz) continuous tone present whenever radio is on.

4. Low pitch beep (300Hz 200 MS) when a button is pressed.

5. Low frequency (150Hz or 112.5Hz) continuous tone while PTT is held.

1-4

1. Normal operation - no error.

2. Code plug error. For all code plug errors try to re-program radio. If this does not clear the fault or if problem recurs, replace the logic board

3. Logic board failure. Replace logic board.

4. Button is not allowed in the current operating condition. Change operating condition (select another mode, etc.)

5. Transmit is not allowed. If it was time-out-timer, you may release PTT then continue your call.

68 No. March, 1997

Page 26

Theory of Operation

RF Board

VHF Receiver Front End, 146-174 MHz

The received signal applied to the radioÕs antenna input connector is Þrst routed through the harmonic Þlter/antenna switch on the RF Power AmpliÞer Board, and then applied via coax to J4 on the RF Board. The insertion loss of the harmonic Þlter/antenna switch is less than 1 dB.

The signal applied to J4 is routed to a Þxed-tuned 4pole Þlter having a 3 dB bandwidth of 57 MHz and a 1 dB bandwidth of 37 MHz centered at 160 MHz. Insertion loss is 1.5 dB typically, and 2 dB at 146 MHz. Attenuation for image protection is 32 dB at 236 MHz, with increasing attenuation at higher frequencies.

The output of the Þlter is matched to the base of RF ampliÞer Q1, which provides 12 dB of gain and has a noise Þgure of 3.6 dB. Current source Q2 is used to maintain the collector current of Q1 constant at 26 mA. Diode CR2 clamps excessive input signals, protecting Q1.

The output of Q1 is applied to a 3-pole Þxed-tuned Þlter having a 3 dB bandwidth of 59 MHz and a 1 dB bandwidth of 48 MHz centered at 160 MHz. Insertion loss is 1.3 dB. Attenuation for image protection is 35 dB at 236 MHz, with increasing attenuation at higher frequencies. Additional image protection is provided by the transmitter harmonic Þlter, which provides at least 20 dB of attenuation at 236 MHz and above.

A pin diode attenuator is located between the 3-pole Þlter and the Þrst mixer. In the Distance mode, Q5 and Q6 are turned on, CR5 is forward-biased which bypasses R12, and no loss is introduced. In the Local mode, Q5, Q6 and CR5 are off, inserting 10 dB of attenuation due to R12. Because the attenuator is located after the RF ampliÞer, receiver sensitivity is reduced only by 5 dB, while the overall third order input intercept is raised by 15 dB. Thus, the Local mode signiÞcantly reduces the susceptibility to IM-related interference.

+13 dBm is delivered to the Þrst mixer from the second RX buffer in the synthesizer circuit.

The mixer output is connected to a diplexer network which matches its output to the Þrst IF ampliÞer Q51 at the IF frequency of 45.1 MHz, and terminates it in a 50 ohm resistor, R51, at all other frequencies.

UHF Receiver Front End

The signal applied to J4 is routed to a Þxed-tuned 3pole shunt resonator Þlter having the following characteristics:

Range 403-433 438-470 465-495 490-520

1 dB BW: 41 MHz 45 MHz 40 MHz 40 MHz 3 dB BW: 77 MHz 65 MHz 60 MHz 55 MHz Loss: 3 dB 1.8 dB 2.2 dB 2.2 dB f Image Rej: 33 dB 30 dB 35 dB 37 dB At f

Attenuation for image protection increases for frequencies lower than f

The output of the Þlter is matched to the base of RF ampliÞer Q1. Current source Q2 is used to maintain the collector current of Q1 constant at 30 mA. Transistors Q3 and Q4 turn off the DC supply to Q1 and Q2 during transmit, reducing the dissipation in Q1. Diodes CR2 and CR3 clamp excessive input signals, protecting Q1. The RF ampliÞer parameters are:

Gain: 16 dB 15 dB 15 dB 15 dB N.F.: 1.4 dB 1.4 dB 1.8 dB 1.8 dB

The output of Q1 is applied to a tunable 4 pole shunt resonator Þlter with these characteristics:

: 418 MHz 455 MHz 480 MHz 510 MHz

CENTER

: 343 MHz 380 MHz 405 MHz 430 MHz

IMAGE

Range 403-433 438-470 465-495 490-520

March, 1997 68 No.

2-1

Page 27

Theory of Operation Name of Manual

RF Board

Range 403-433 438-470 465-495 490-520

1 dB BW: 35 MHz 45 MHz 40 MHz 40 MHz 3 dB BW: 44 MHz 60 MHz 60 MHz 55 MHz Loss: 4.2 dB 3.7 dB 3.8 dB 3.8 dB f Image Rej: 55 dB 40 dB 52 dB 54 dB At f

: 418 MHz 455 MHz 480 MHz 510 MHz

CENTER

: 343 MHz 380 MHz 405 MHz 430 MHz

IMAGE

Again, image attenuation increases for frequencies lower than f

IMAGE

A pin diode attenuator is located between the 4 pole Þlter and the Þrst mixer. In the Distance mode, Q5 and Q6 are turned on, CR5 is forward-biased which bypasses R12, and no loss is introduced. In the Local mode, Q5, Q6 and CR5 are off, inserting 10 dB of attenuation due to R12. Because the attenuator is located after the RF ampliÞer, receiver sensitivity is reduced only by 5 dB, while the overall third order input intercept is raised by 15 dB. Thus, the Local mode signiÞcantly reduces the susceptibility to IM-related interference.

The Þrst mixer is a passive, double-balanced type consisting of T1, T2 and U1. This mixer provides all of the necessary rejection of the half-IF spurious response, since the improvement due to Þlter selectivity is negligible at 470 MHz. Low-side injection is delivered to the Þrst mixer from the second RX buffer in the synthesizer circuit. The injection level is +11.6 dBm for 403-433 range, +5 dBm for the 438-470 MHz range, and +6.5 dBm for the 465-495 and 490-520 MHz ranges.

Receiver Back End

Q51 ampliÞes the IF signal by approximately 17 dB. The output of Q51 is Þltered by a four pole crystal Þlter (comprised of two matched units Y51A and Y51B). The 3 dB bandwidth of the crystal Þlter is 14 kHz for 20/ 25 kHz channel spacing models, and 8 kHz for

12.5 kHz channel spacing models. The signal is ampliÞed 18 dB by the second IF ampliÞer Q52, and applied to the input of the receiver system IC U51-19 (see Figure 2-1).

The 45.1 MHz Þrst IF signal is applied to the second mixer section of U51. A 44.645 MHz crystal oscillator provides the low side injection signal, which is also applied to U51-19. The output of the second mixer is a 455 kHz second IF signal which is Þltered by ceramic Þlter FL51, ampliÞed, Þltered by ceramic Þlter FL52, and applied to the audio detector. As with the crystal Þlter, the bandwidth of the ceramic Þlters are narrower for 12.5 kHz channel spacing models than for 20/ 25 kHz. The IF test point is located at the output of Þlter FL52. The level of the 455 kHz signal at this test

point is linearly related to the input signal level at the antenna, allowing a convenient metering point for Þlter tuning and gain measurements.

The audio detector is a peak-differential type, with the necessary phase shift (90û at 455 KHz) provided by L-C network L61. Recovered audio from U51-5 is routed to the receiver audio circuitry on the logic board, and to the squelch circuitry contained in U51. When an onchannel signal is present, the amount of high-frequency audio noise at the detector output is reduced. This change in noise level is sensed to indicate the presence of an on-channel signal. Audio noise at U51-5 is applied to U51-7 via R61 and C82. Extreme high-frequency noise is removed by C81. The noise is ampliÞed and appears at U51-6 where it is coupled via C80 to the SQUELCH adjust pot R60. The output of this control is applied via R59, C79 and C78 to pin 8 which is the input of a limiting ampliÞer and threshold detector.

Noise levels greater than a preset threshold cause U5111 to go high. This is buffered by Q53 and routed to the microcomputer circuitry on the logic board. This corresponds to no channel activity. When the noise level decreases below the threshold, due to on-channel quieting, U51-11 goes low, providing a low to the logic circuitry. This implies an on-channel signal is present, causing unmuting of the receive audio path by the microcomputer.

Components R58, C75 and C76 determine squelch time constants as a function of the charging currents supplied by U51. These charging currents vary from weak to strong signal conditions, providing a variable squelch closing time-constant. For weak signals the time constant is long to minimize ÒchatteringÓ or rapid muting and unmuting of the audio. For strong signals, where the carrier-absent to carrier-present conditions are substantial, the closing time-constant is shortened to minimize the length of the Òsquelch-tailÓ.

Frequency Synthesizer

To determine the synthesizerÕs operating frequency, the microcomputer loads the frequency divider information into the PLL IC U101 (see Figure 2-2). The PLL IC contains three programmable dividers. The program is serially loaded via the SR DATA line to U101-

10. The data is loaded one bit at a time, with each lowto-high transition of the SR CLOCK at U101-11 latching data from shift registers into the reference divider (R), divide-by-N, or divide-by-A latches depending on the control bit. A logic high of the control bit selects the reference counter latch, while a logic low selects the divide-by-N, or divide-by-A counter latch.

After the microcomputer loads data into the PLL IC, the SYNTH LATCH ENABLE line goes low. The synthesizer is then ready to generate a receive Þrst-injection or transmit frequency.

2-2

68 No. March, 1997

Page 28

Name of Manual Theory of Operation

RF Board

Figure 2-1. Receiver IC Block Diagram

In UHF radios, for example, the latches are loaded with data to give 5 kHz (or 6.25 kHz) at the output of the divide-by-R counter when the reference signal is applied at U101-1, and 5 kHz (or 6.25 kHz) at the output of the divide-by-N counter when the VCO is operating at the desired receive injection or transmit frequency.

During the frequency synthesis, the divide-by-A and divide-by-N counters begin counting down from the programmed values (A and N respectively) at the same time. The modulus control line U101-12 is low so the divide-by-127/128 prescaler divides by 128. Therefore, the effect of the prescaler U102 is to divide the VCO output by 128 and apply it to U102-8. When the divideby-A counter completes counting down, the control logic sets the modulus control line high, and the divide-by-127/128 prescaler divides by 127 until the divide-by-N counter completes the programmed value on N. After the divide-by-N counter completes counting down, the counters are set back to their programmed values. The effect of the prescaler and divide-by-A, divide-by-N counters is to divide the VCO frequency by a number, N, where:

N = 128 x A + 127 x (N-A) = 127 x N + A

The output of the divide-by-N counter is equal to:

/ (127 x N + A)

VCO

When the phase-locked loop is locked:

/ (127 x N + A) = 5 kHz = f

VCO

/ N

The reference oscillator frequency is 14.4 MHz and the output of the divide-by-R must be 5 kHz. Therefore:

R = 14.4 MHz / 5 kHz

The values of A and N are dependent on the desired VCO frequency which is equal to the transmit frequency, or to the receive frequency minus 45.1 MHz (for UHF radios).

N = integer part of N

A = remainder of N

/ 127

The 5 kHz outputs of the divide-by-A and divide-by-N counters are applied to phase detector A. The output of

March, 1997 68 No.

2-3

Page 29

Theory of Operation Name of Manual

RF Board

2-4

Figure 2-2. Synthesizer Section Block Diagram

68 No. March, 1997

Page 30

Name of Manual Theory of Operation

RF Board

phase detector A is applied to phase detector B. There are two output signals for phase detector B, phase R (U101-16) and phase V (U101-15), which consist of pulses whose pulse width depends on the phase error between the two signals at phase detector A. If the frequency f

is greater than fR, then error information is

provided by phase V pulsing low, while phase R remains essentially high. When f

and f

are both in

phase, both phase V and phase R remain high, except for a small minimum time period, and they both pulse low in phase. These pulses are applied to the charge pump and are used to correct (steer) the VCO frequency.

The above discussion is for a UHF radio with a 5 kHz reference frequency. VHF radios use a divide-by-64/65 prescaler, and the receive VCO frequency is equal to the receive frequency plus 45.1 MHz. Either a 5 or

6.25 kHz reference frequency may be used depending on the desired frequencies and channel spacing.

When the synthesizer is locked, U101-7 applies a high level signal with very narrow negative-going pulses to the out-of-lock detector. The very narrow low pulses have a high average DC level that is not sufÞcient to turn on transistor Q101. This keeps the voltage across C102 low, which indicates an in-lock condition.

When the synthesizer is out-of-lock, the output of U101-7 becomes a pulsating DC signal with an average DC level that varies between 0.5V and 4.4V. This turns on Q101 and charges C102 to at least 3.0 volts, indicating an out-of-lock condition. Transmitter output and receiver audio are inhibited under these circumstances.

The 5V DC operating voltage for the synthesizer and prescaler is derived from a voltage divider buffered by Q106. Due to the low and relatively constant current drain requirements, a more elaborate regulator is unnecessary.

Charge Pump

The charge pump consists of Q102-Q105. The phase V (U101-15) signal from the PLL IC is applied to Q103 while phase R (U101-16) is applied to Q102. Then the synthesizer is locked, both signals consist of a pulse train with a period of 160 or 200 usec and negativegoing pulses. The phase R negative pulse turns off Q102 and brings the emitter of Q104 to 9.6V which turns on Q104. The negative pulse of phase V turns Q103 off which reduces the current ßow to R114 and in turn reduces the voltage across R114. This will cause Q105 to turn on and sink current from Q104.

When the synthesizer reaches lock, the voltage at the steering line will be between 1.3V and 7.8 V DC. When the synthesizer is reprogrammed to a new frequency, the previous SL voltage would now give a wrong frequency and will cause the phase R and phase V to have different pulse widths. This will cause Q104 and Q105 to turn on and off at different times, resulting in a series

of summed current pulses to the loop Þlter that charges or discharges C110 to the new SL voltage. If the frequency of the VCO is higher than that of phase R, then C110 discharges; if lower, C110 charges.

Loop Filter

The loop Þlter consists of R119 through R121 and C109 through C112, as well as C205 and C258 in the VCO compartment. The loop Þlter is a low pass Þlter that attenuates noise and rejects the loop reference frequency so that these signals cannot modulate the VCO. The voltage across C110 is the steering line voltage which controls the VCO frequency.

Reference Oscillator

The reference oscillator is a Colpitts design using a

14.4 MHz crystal element. Each crystal has a unique 8digit temperature coefÞcient code which must be keyed into the radio during chassis auto tune. The reference oscillator is warped to the desired range by adjusting L151 while supplying 5.2

0.01V DC at J6-9. Further frequency warp adjustment is done electronically by changing the control voltage applied to varactors CR151 and CR152 by the logic board.

Temperature compensation is applied in the same manner, based on the temperature of the crystal as sensed by zener diode VR176, which is physically close to Y151. The forward voltage drop of this diode is proportional to the actual crystal temperature. This forward voltage is ampliÞed by a precision DC ampliÞer, U176 and associated components, to a DC level sufÞcient to be read by one of the A/D inputs of the microcomputer on the logic board. The appropriate control voltage is applied, based on the crystalÕs temperature coefÞcient code, to maintain

2.5 ppm stability over the

entire operating temperature range.

For transmissions of PL/DPL or data with low-frequency content, the reference oscillator is modulated to extend the low frequency modulation capability of the synthesizer below the loop Þlter cutoff frequency. Modulation is applied to the frequency control varactors CR151 and CR152 via J6-13 and REF MOD adjust pot R164.

VCO’s and Buffers

Two VCOÕs are used, one for transmit and one for receive. These are selected by switching circuitry Q277 through Q279, which applies 8.5V DC supply voltage to the appropriate oscillator and buffers. The incoming

9.6V DC voltage is Þrst Þltered by Q276 to remove noise which might be introduced into the VCOÕs. Q276 acts as a C- multiplier, which effectively multiplies the capacitance of C277 by the gain of transistor Q276. In the receive mode, J6-4 is pulled high by R276, turning off Q277 and Q278, allowing Q279 to conduct and supply RX 8.5V. In the transmit mode, J6-4 is pulled low by

March, 1997 68 No.

2-5

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Theory of Operation Name of Manual

Logic Board

the logic board. Q277 conducts to supply TX 8.5V, and Q278 saturates across the base-emitter of Q279, turning it off.

Each VCO consists of a FET oscillator whose frequency is determined by a parallel L-C network consisting of a tunable coil and a network of varactors. As the steering line varies over the range of 2V to 7.8V DC, the capacitance of the varactors decreases as voltage is raised, causing the oscillator frequency to increase. The transmit VCO has an additional varactor, CR208, which is very lightly coupled to the tank circuit, which provides frequency modulation of the VCO from the audio signal applied at J6-10 and adjusted by VCO MOD adjust pot R302.

Each VCO has an AGC rectiÞer circuit (CR206 or CR214) which varies the DC gate bias on the VCO FET as a function of the RF output level at the VCOÕs drain. This helps maintain a more constant VCO output level, and prevents RF voltages from increasing to levels which might cause rectiÞcation by the varactors.

Transistors Q204, Q205 are receive buffer ampliÞers. These raise the RF output of the VCO to the level required as injection for the Þrst mixer, typically between +5 and +13 dBm depending on the frequency band, as detailed in sections 1.1 and 1.2. The RF at Q205Õs base is sampled and fed back to the synthesizer via buffer Q107, allowing the synthesizer to ÒknowÓ if the VCO is operating at the correct frequency.

Similarly, transistors Q207, Q208 are transmit buffer ampliÞers. These raise the RF output of the VCO to the level required by the RF power ampliÞer, typically +13 to +14.5 dBm, as measured at J5, which is a 50 ohm port. The VCO frequency is sampled at Q208Õs base and fed back to the synthesizer via buffer Q107.

Logic Board

There are two versions of logic boards used in GM300 series mobile radios, ÒmaskedÓ and Òexpanded.Ó The expanded logic board has a shielded compartment which encloses the microcomputer, custom gate array, and external memory ICÕs, and has a four-layer printed circuit board layout. The masked logic board uses a two- layer circuit board without the shielded compartment, with all software functions contained in a single masked microcomputer IC. In general, the masked logic board is used in 2 and 8 channel models with basic signaling capabilities, while the expanded logic board is found in 16 channel models having more elaborate signaling systems or requiring programmable accessory connector I/OÕs.

¥ Receiver audio circuitry

¥ Transmitter audio circuitry

¥ Transmitter power control circuitry

DC Distribution and Regulation

All operating voltage for the radio is supplied from the RF power ampliÞerÕs battery input connector J2. This voltage is protected from reverse polarity or excessive positive transients by CR2270, CR2370, CR2470, CR2570, CR2670 or CR2770 (depending on power ampliÞer kit), which acts as a power diode for reverse polarity protection, as well as a power transient suppressor due to its reverse avalanche characteristics. The supply voltage is routed to the logic board via J7-5 (UNSW B+).

Whenever UNSW B+ is supplied, a continuous source of 5V DC is applied to pin 2 of the microcomputer from the RAM 5V supply (VR402, CR403, R410 and C408). This maintains the radioÕs scan list, current operating mode, etc., when the radio is turned off. Due to the storage of C408, this information can be maintained for up to several hours even if the battery supply voltage is interrupted.

When ignition control is not used, UNSW B+ via fuse F801 becomes B+ which is routed through the on-off switch to become SW B+. When ignition control is used, fuse F801 is removed, and the vehicleÕs ignitionswitched voltage is supplied to J3-10 which is the B+ that is routed through the on-off switch to become SW B+. Thus, with ignition control, ignition-controlled voltage must be present at J3-10 for the radio to operate.

In 2-layer masked logic boards, when the radio is turned on, SW B+ turns on Q404 via R414, which then turns on Q403 via R412. When Q403 is on, UNSW B+ is applied to to the supply pins of opamps U401 and U451 (energizing the 9.6 volt regulator and transmitter power control circuits). The low saturation voltage of Q403 keeps the supply voltage of the transmitter power control circuit essentially equal to the UNSW B+ voltage present in the RF Power AmpliÞer. This is important for accurate power control operation. SW B+ is also routed to 5 volt regulator U402 (powering the microcomputer and logic circuitry) and to J3-13, the SW A+ sense pin on the accessory connector. The current drawn through the on-off switch is relatively low, less than 400 mA, and the majority is that required by the 5V regulator. All high current stages, such as the RF and audio power ampliÞers, operate from UNSW B+ and are controlled by low currents.

The logic board circuitry consists of Þve major sections:

¥ DC distribution and regulation

¥ Microcomputer and logic

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In 4-layer expanded logic boards, power distribution is similar except that Q403 also switches the supply voltage to the 5 volt regulator IC U402. The higher current drain from the 5V regulator due to the expanded logic circuitry does not need to ßow through the radioÕs on-

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off switch in this case. However, in 4-layer boards Q403 is a TMOS device, which exhibits very low on- resistance (less than 0.6 ohm) and therefore negligible voltage drop, without requiring large base current ßow to saturate it.

The 9.6V regulator uses an opamp as a controlling element. The regulated output voltage is divided by R404 and R405 and compared with an accurate reference voltage (5.03V DC) determined by VR401. The opampÕs output voltage (U401A-1) varies the amount of conduction in in Q402 and Q401 as necessary to keep these two voltages (U401A-2 and -3) equal. A characteristic of the opamp which allows the regulator to start up is the fact that the output is high when both inputs are low, which occurs momentarily at turn-on. Diode CR401 is used to protect Q401 if the 9.6V line is grounded. When this happens, Q402Õs base can only be

0.7V DC and Q401 will be turned off. Diode CR402 provides temperature compensation of the regulated output voltage. The 9.6V supply powers the opamps in the receive and transmit audio circuits, the D/A converter, the RF board circuitry, and low level stages of the RF power ampliÞer.

The 4.8V DC reference is formed by divider R408-R409, Þltered by C405, and buffered by unity gain opamp U401B to provide a low- impedance and low noise half-supply reference voltage for the opamps in the audio circuits.

The 5V regulator uses an IC, U402, to provide operating voltage for the microcomputer and logic circuits and the front panel LED displays. This IC generates a low reset pulse when turned on which is used to initialize the microcomputer at power-up. The timing of this pulse is determined by C409.

Microcomputer and Logic

GM300 radios use the Motorola 68HC11E9 microcomputer, U802, which utilizes:

¥ 7.776 MHz clock rate

¥ Multiplexed 8 bit address/data lines

¥ 16 bit addressing

¥ Internal watchdog circuitry

¥ Analog to digital conversion input ports

Additional control logic surrounding U802 consists of:

1. D/A CONVERTER U801. This IC is used to generate precision analog voltages for transmitter power control, deviation adjustment, and reference oscillator frequency warp.

2. CUSTOM GATE ARRAY U803. This device expands the input/output capabilities of the control logic. U802 and U803 exchange infor-

mation which tells the microcomputer the input port status and the desired state of the output ports. Used in expanded logic boards only.

3. EPROM U804. This is an Erasable Programmable Read Only Memory, whose function is to store the microcomputerÕs operating program. Used in expanded logic boards only.

4. EEPROM U805. This is an Erasable Programmable Read Only Memory, which acts as the radioÕs code plug. It supplements the capability of the EEPROM contained within U802, storing additional operating information pertinent to a particular radio, such as operating frequencies, signaling codes, scan lists, timeout timer, programmable I/O assignments, and other special functions. Used in expanded logic boards only.

5. SRAM U806. This Static Random Access Memory is used for Òscratch padÓ operations. Used in expanded logic boards only.

In masked logic boards, the microcomputerÕs operating program is permanently written or ÒmaskedÓ within the microcomputer. Included in U802 is an EEPROM memory which stores channel, signaling, and scan list information, similar in function to U805 but with less storage capability.

Microcomputer Start-Up Routine

The microcomputer is operational after the RESET line is released by U402 at turn-on. Y801, the crystal oscillator, should be stable at this point. Y801Õs frequency is divided by four by U802 to produce the E-CLOCK (1.944 MHz, at U802-5) which is the data clock for microcomputer and, in expanded logic boards, gate array U803. The microcomputer then executes a selftest routine and generates an error tone if a failure is detected. Q807 shifts the crystal frequency very slightly by introducing network L801/C831 when Q807 is off. This can be used to remove an on-channel self-quieting signal which is a harmonic of the crystal, if necessary.

Microcomputer Operation-Expanded Logic

In expanded logic boards, a successful self test of the control logic will activate the multiplexed address/ data bus. The microcomputer has an eight bit address/ data bus and an eight bit address-only bus. These bus lines are connected to gate array U803 for I/O port information, and to the external memory ICÕs to send and receive information.

The custom gate array must de-multiplex the lower order address byte from the address/data bus (AD0AD7) in order to address a particular function or memory location.

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The microcomputer puts the address information on AD0-AD7 and the information is then passed to U803. The address strobe ÒASÓ is pulsed low and the byte is latched. The de-multiplexed address byte A0-A7 is then available on U803. The bus is now ready for the transmission of data. The higher order address byte A8-A15 is not multiplexed and is readily available at the microcomputer U802.

Reading or Writing in Memory-Expanded Logic

In expanded logic boards, the speciÞed memory IC must Þrst be enabled before a read/write operation can take place. Each memory IC has its own chip select line. EPROM SEL originates at U803- 13, EEPROM SEL at U803-14, and SRAM SEL at U803-15. The lines are normally logic high; a speciÞc IC is selected when the appropriate line is pulsed low.

The R/W line from U803-16 determines if data is being read (logic high) or written (logic low). EPROM U804 is a read-only memory and does not require a R/W input.

The output enable line ÒOEÓ, when pulsed low, will enable the tri-state output gates to pass the contents of the desired address out onto the A/D bus.

Programmable I/O’s

In masked logic boards, the function of J3-14 is programmable by the placement of push-on jumper JU809. In the ÒREMOTEÓ position, J3-14 provides the hook function for a remote desk set. When pulled low, the radio is forced Òoff-hookÓ or into a monitor condition. In the ÒPAÓ position, J3-14 provides the public address enable function; when pulled low, transmitter PTT is inhibited.

In expanded logic boards, pins 8, 12 and 14 are software- programmable I/OÕs, pins 6 and 9 are software programmable inputs, and pin 4 is a software-programmable output. If, for example, J3-14 is used as an input, U803-39 will be logic low, keeping Q814 off. When an accessory pulls J3-14 low, Q813 will turn off, and the resulting logic high at its collector will be read by U803-24. If J3-14 is programmed as an output, the signal provided by U803-39 will turn Q814 on or off as needed, supplying either an active low or a logic high (pulled up by R901, 4.7k) to the accessory. By moving JU808 from its normal PROG I/O position to the SCI+ position, J3-12 can be used as an SCI programming line, electrically connected via J8-9 to the SCI+ pin on the microphone connector (pin 7).

Receiver Audio

Voice Path

Detector audio from the RF board is routed via J6-3 to U551A. A series resistor on the RF board, R62, is chosen

to provide an additional 6 dB of receiver audio gain in

12.5 kHz channel spacing models, where full system deviation is one half of that used for 25/30 kHz channel spacing. The gain of U551A is chosen so that supply-rail limiting occurs at 20% above full system deviation. This limits the amplitude of impulse-type ignition noise. Noise above 3 kHz is attenuated by a 3pole low pass Þlter (U551B) whose Bessel-Thompson characteristic is chosen to minimize ringing due to impulse-type noise. Following is a 5-pole biquadratic 300 Hz high-pass Þlter (U552A and B) which attenuates subaudible signaling tones such as PL and DPL. This is followed by de-emphasis ampliÞer U553A, mute gate Q551 and summing ampliÞer U553B which combines the receive audio signal with alert tones generated by the microcomputer at U802-29 and Þltered by C566 and C567. The output of U553B is routed to the volume control via J8-1, from the volume control via J82 to the input of the audio power ampliÞer, U501.

The audio power ampliÞer is a BTL (bridge-tied load) conÞguration providing 7.5 watts rms into an external 8 ohm speaker. Both sides of the speaker are driven with out-of-phase signals, therefore neither side of the speaker can be grounded. The outputs are internally protected against accidental short circuits to supply or ground. The internal speaker has a 22 ohm impedance which limits the power delivered to it to 3 watts, which is within its rating. The audio power ampliÞer is turned on when a sense voltage greater than 8 volts DC is applied to pin 8. This is obtained from SW B+ via R501. When no audio output is required, U501 is turned off by saturating transistor Q501, providing 0 volts to U451 pin 8. This allows muting of the audio power ampliÞer. When the radio is turned off, SW B+ is not present, so there is no source of voltage to pin 8 via R501, keeping U501 off. When muted (pin 8 low), U501 draws no current from the UNSW B+ source. Capacitor C504 controls the turn on and turn off timing of the power ampliÞer to minimize transients. C501 and C502 provide low and high frequency Þltering respectively.

When any front panel button is pressed, a beep is heard in the speaker. This is produced by the microcomputergenerated alert tone applied to stage U553B, as discussed above. U501 is enabled by turning off Q501, however mute gate Q551 remains muted so that the beep is heard but noise or signals from the receiver are not. Alert tones are also used by various signaling systems, or for error tones during self-test.

Receiver audio is available at the accessory connector J3-11. Depending on the position of push-on jumper JU551, audio may be either de-emphasized, Þltered and muted, derived from the output of U553B, or ßat and unmuted, derived from the output of U551A in masked logic boards or from buffer U651B in expanded logic boards.

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Data Path

Receiver audio is also used for decoding of signaling tones or codes. There are two general classiÞcations of the types of data involved. High-speed data refers to data which occupies the voice range of frequencies (between 300 and 3000 Hz, although it can also occupy the entire range from less than 1 Hz to 3000 Hz). This data is not transmitted simultaneously with voice. The other type is low-speed data, which is contained to frequencies below 300 Hz, generally at reduced deviation levels, and may be transmitted simultaneously with voice. MDC1200 and Select 5 are examples of highspeed data; PL and DPL are examples of low- speed data.

Low speed data is obtained from U551B-7, which contains frequencies between 0.6 Hz and 3000 Hz. It is buffered by U602A and Þltered by U603A and U603B in masked logic boards, or U602B and U603A in expanded logic boards. These form a 5-pole biquadratic low pass Þlter, attenuating all signals above 250 Hz. This Þlter prevents voice from interfering with low-speed data detection. This is fed to a center-slicer (U601B in masked, U603B in expanded) which converts the tone or data into a symmetrical square wave which can be decoded by the microcomputer. The center slicer tracks out near-DC offsets to maintain waveform symmetry. In expanded boards, U603B is an opamp rather than a comparator, and transistor Q601 is used to provide level shifting to a 0-to-5V logic level.

High speed data can be obtained from either U551B-7, the same point as for low-speed data, or from U552B-7, which only contains frequencies between 300 and 3000 Hz. If the type of data does not contain information below 300 Hz, the use of additional 300 Hz high-pass Þltering improves detector sensitivity. No additional Þltering is required, only that the signal is squared up by center-slicer U601A before being applied to the microcomputer for decoding.

Transmitter Audio

tion is adjusted by programming the DC output voltage of D/A converter U801-6. This allows electronic adjustment of deviation, compensation for sensitivity variations across the operating frequency band, and choice of full system voice deviation on non-PL or DPL channels, or reduced voice deviation on channels with PL or DPL. The output of attenuator U653 is routed through U652B, a 3-pole biquadratic 3000 Hz low-pass ÒsplatterÓ Þlter, before being applied to the RF board as VCO modulation via J6-10.

Radios used in 12.5 kHz channel spacing systems require full deviation of 2.5 kHz, instead of 5 kHz for 25/30 kHz systems. This reduction is accomplished by resistor values on the RF board surrounding the VCO MOD and REF MOD adjust posts.

Data Path

High speed data is generated by microcomputer outputs U802-30 and 31 which are summed by opamp U602B (masked) or U701A (expanded). The ratio of R701 and R702, and the relative timing of the transitions of the two microcomputer outputs, allow lowdistortion simulated sinewaves to be generated. The opamp output is routed to the input of limiter U651A, where it is summed with pre-emphasized mic audio. The audio path from U651A to the limiter is not preemphasized. The remainder of the audio path to the modulator is the same as for the voice signal path.

In masked logic boards, audio applied to accessory connector J3-5 is applied, without pre-emphasis, to the input of the limiter U651A. In expanded logic boards, jumper JU701 allows either this path to be chosen (position ÒAÓ), or allows J3-5 audio to be routed via low-speed data Þlter U701B (JU701 in position ÒBÓ) and introduced into the transmitter audio path after the limiter. In this conÞguration, externally-generated PL may be applied to the transmitter without being ÒcapturedÓ (attenuated or removed entirely) when limiting due to voice peaks occurs.

Voice Path

Microphone audio is routed from the front panel mic jack via J8- 14, or from accessory connector J3-2, to the mic mute gate Q651. DC bias is applied to operate the transistor ampliÞer within the micro-phone. Q651 is controlled by Q652 and mutes the microphone audio path during receive mode or during transmission of high- speed signaling or data. When low mic gain (80 mV rms for 60% deviation) is selected by JU651, the signal is pre-emphasized by C652 and R655; for highgain (40 mV rms), by C667 and R647. Supply rail limiting by U651A prevents over-deviation.

The signal is then routed to the RF board reference oscillator modulation input via J6-13, and, via buffer U652A, to voltage controlled attenuator U652. Devia-

March, 1997 68 No.

Low speed data is generated by microcomputer outputs U802-27 and 28 which are summed by opamp U651B (masked) or U701B (expanded). The ratio of R706 and R707 allow low-distortion simulated sinewaves to be generated. The opamp is conÞgured as a 3pole biquadratic low pass Þlter to remove any distortion components of the low speed data signal above 300 Hz which would fall within the voice range. This audio is resistively summed with the output of the limiter U651A. In this manner, limiting on voice peaks will not affect the continuous low speed data transmission. The summed audio is then routed to the REF MOD input of the RF board via J6-13, and to the voltage controlled attenuator, splatter Þlter, and VCO MOD input of the RF board (J6-10), following the same path as voice signals.

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Transmitter Power Control

Control Line Functions

As discussed earlier, all DC operating voltage for the radio originates from the RF power ampliÞer via J7-5 (UNSW B+). In addition, J7 receives DC control voltages from, and supplied DC control voltages to, the RF power ampliÞer circuitry.

In the transmit mode, Q455 conducts, supplying 9.6T (keyed 9.6V DC) via J7-1 to the antenna switch and providing bias (and collector voltage, in UHF models) for the Þrst transmitter stage.

Controlled B+ is supplied via J7-2 to the collector of the Þrst (VHF) or second (UHF) transmitter stage. As this voltage varies over the range of 3 to 12.5V DC, transmitter output power is varied over the range of 10 to 25 watts.

A small-value (.01 to 0.2 ohm) resistor is placed in series with the DC supply to the RF Þnal ampliÞer, and the voltage across this resistor is measured via the current sense high (J7-3) and low (J7-4) lines.

The temperature of the Þnal RF ampliÞer is monitored by a thermistor mounted next to it. The thermistor is part of a voltage divider network whose output voltage is routed, via J7-6, to an A/D input of the microcomputer, U802-49.

Power Control Operation

microcomputer reduces power via the D/A converter to achieve a safe equilibrium.

Under any circumstance, controlled B+ is prevented from exceeding a pre-programmed DC voltage. The voltage is divided by R471 and R472 and monitored by microcomputer A/D input U802-45 every 17 msec. If voltage exceeds the maximum allowable, the DAC is decremented one step, and this process is repeated as needed.

RF Power Ampliﬁers

This manual covers several different power ampliÞer kits. Each is optimized for the speciÞc frequency and power output range of the radio model in which it is used. All are similar in that they can be divided into three basic circuits:

¥ Power ampliÞer

¥ Antenna switch

¥ Harmonic Þlter

1-10 Watt VHF Power Ampliﬁer

The 1-10 watt VHF power ampliÞer is designed to cover the range of 146-174 MHz. It consists of three stages. The Þrst stage, Q2210, operates in Class A with its operating voltage supplied by the 9.6T source. It has a gain of 9 dB and delivers 160 mW of output power.

Power level is programmed electronically during radio tune-up at the factory. The software varies the DC output voltages of D/A converters U801-2 and U801-4 (two D/AÕs are summed for increased resolution) and applied to the (+) input of opamp U451A. As D/A voltage increases, U451A-1 output voltage increases, which causes greater conduction in Q453 and Q452, thus increasing the control voltage and RF power output. The values of R810, R811, R462 and R463 reduce the D/A output voltage range (0 to 9V DC) to the required 4V to 6V DC range at U451A-3.

If the DC current of the Þnal RF ampliÞer increases excessively due to, for example, an antenna system fault, the increased voltage drop across the series resistor will be sensed by U451B, causing the current through Q454 to increase until the two inputs of U451B are again equal (the collector resistor of Q454 is on the RF power ampliÞer board since its value is optimized for different power ampliÞers). The increase in Q454 current raises its emitter voltage which is applied to the (-) input of U451A. This is in a direction to reduce the output voltage of U451A-1, reducing conduction in Q453 and Q452, lowering the controlled B+ voltage to counteract the excessive current condition.

Excessive RF Þnal ampliÞer temperature causes an increase in the THERMAL DC voltage at U802-49. The

The second stage, Q2220, is operated in Class C and also has 9 dB of gain. The collector voltage is supplied from controlled B+. The output level of this stage is varied by changes in the controlled B+ voltage. This stage delivers up to 1.3 watts output.

The third stage, Q2230, is the Class C RF Þnal power ampliÞer. It can output in excess of 14 watts. Collector current is monitored by the power control circuit by measuring the voltage drop across a 0.2 ohm resistor, R2274, placed in series with the collector DC supply lead.

The antenna switch consists of two pin diodes, CR2250 and CR2251. L2252 is parallel-resonant with the off capacitance of CR2250, increasing its attenuation when off. C2253 is a DC block.

In the receive mode, both diodes are off. Signals applied at the antenna jack J1 are routed, via the harmonic Þlter, through network L2251, C2251 and C2252 to the receiver input. In the transmit mode, 9.6T is present and both diodes are forward-biased into conduction. The transmitter RF from Q2230 is routed through CR2250, and via the harmonic Þlter to the antenna jack. CR2251 conducts, shunting RF power and preventing it from reaching the receiver. L2251 is selected to appear as a 1/4 wave at VHF, so that the low

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impedance of CR2251 appears as a high impedance at the junction of CR2250 and the harmonic Þlter input.

The harmonic Þlter is a nine pole 0.1 dB ripple Chebychev low pass Þlter with a 3 dB frequency of approximately 205 MHz and less than 1 dB insertion loss in the passband.

10-25 Watt VHF Power Ampliﬁer

The 10-25 watt VHF power ampliÞer is designed to cover the range of 146-174 MHz. It consists of three stages. The Þrst stage, Q2310, operates in Class A with base bias supplied by the 9.6T source. The collector voltage is supplied from controlled B+. The output level of this stage is varied by changes in the controlled B+ voltage.

The second stage, Q2320, is operated in Class C. Collector voltage is supplied by UNSW B+. This stage delivers up to 3 watts output.

The third stage, Q2330, is the Class C RF Þnal power ampliÞer. It can output in excess of 30 watts with 3 watts input power. Collector current is monitored by the power control circuit by measuring the voltage drop across a .05 ohm resistor, R2371, placed in series with the collector DC supply lead.

provides 11 dB of gain and has an output power of 250 mW.

The second stage, Q2320, is operated in Class C. The collector voltage is supplied from controlled B+. The output level of this stage is varied by changes in the controlled B+ voltage. It has a gain of 9.1 dB and provides up to 2 watts of output power.

The third stage, Q2430, also operates in Class C. The collector voltage is supplied directly from the UNSW B+ source. This stage has a gain of 8.8 dB and an output power of 15 watts. Feedback is used to control the gain and maintain stability.

The fourth stage, Q2440, is the Class C RF Þnal power ampliÞer. It has a gain of 6 dB and can output in excess of 60 watts with 15 watts of input power. The power control circuit monitors this stageÕs collector current by measuring the voltage drop across a .01 ohm resistor, R2471, placed in series with the collector DC supply lead.

The antenna switch consists of two pin diodes, CR2450 and CR2451. L2453 and C2453, combined with the internal ÒonÓ inductance of CR2451, form a series resonant circuit to lower the shunt impedance presented by CR2451 when it is conducting.

The antenna switch consists of two pin diodes, CR2350 and CR2351. L2353 is parallel-resonant with the off capacitance of CR2350, increasing its isolation when turned off. C2354 is a DC block. L2352 and C2352, combined with the ÒonÓ inductance of CR2351, form a series resonant circuit to lower the shunt impedance presented by CR2351 when it is turned on.

In the receive mode, both diodes are off. Signals applied at the antenna jack J1 are routed, via the harmonic Þlter, through network L2351, C2351 and C2353 to the receiver input. In the transmit mode, 9.6T is present and both diodes are forward-biased into conduction. The transmitter RF from Q2330 is routed through CR2350, and via the harmonic Þlter to the antenna jack. CR2351 conducts, shunting RF power and preventing it from reaching the receiver. L2351 is selected to appear as a 1/4 wave at VHF, so that the low impedance of CR2351 appears as a high impedance at the junction of CR2350 and the harmonic Þlter input.

The harmonic Þlter is a nine pole 0.1 dB ripple Chebychev low pass Þlter with a 3 dB frequency of approximately 205 MHz and less than 1 dB insertion loss in the passband.

25-45 Watt VHF Power Ampliﬁer

The 25-45 watt VHF power ampliÞer is designed to cover the range of 146-174 MHz. It consists of four stages. The Þrst stage, Q2410, operates in Class A with its operating voltage supplied by the 9.6T source. It

In the receive mode, both diodes are off. Signals applied at the antenna jack J1 are routed, via the harmonic Þlter, through network L2452, C2454 and C2455 to the receiver input. In the transmit mode, 9.6T is present and both diodes are forward-biased into conduction. The transmitter RF from Q2440 is routed through CR2450, and via the harmonic Þlter to the antenna jack. CR2451 conducts, shunting RF power and preventing it from reaching the receiver. L2452 is selected to appear as a 1/4 wave at VHF, so that the low impedance of CR2451 appears as a high impedance at the junction of CR2450 and the harmonic Þlter input.

The harmonic Þlter is a seven pole 0.1 dB ripple Chebychev low pass Þlter with a 3 dB frequency of approximately 200 MHz and a typical insertion loss of 0.8 dB in the passband.

1-10 Watt UHF Power Ampliﬁer

The 1-10 watt UHF power ampliÞer is designed to cover the range of 438-470 MHz and has three stages. The Þrst stage, Q2510, operates in Class A. Its operating voltage is supplied from 9.6T. This stage provides 9 dB of gain and an output of 200 milliwatts.

The second stage, Q2520, has a nominal gain of 10 dB and power output of up to 2 watts. The output of this stage is adjusted by varying the controlled B+ which supplies DC operating voltage to its collector. This stage operates in Class C.

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The third stage, Q2530, is the Class C RF Þnal power ampliÞer. It provides 8.75 dB of gain and an output power of up to 15 watts. Collector voltage is supplied from UNSW B+ via a 0.2 ohm resistor, R2570. By measuring the voltage drop across this resistor, the power control circuit compensates for variations in Q2530Õs collector current.

The antenna switch consists of two pin diodes, CR2550 and CR2551. L2553 is parallel-resonant with the off capacitance of CR2550, increasing the diodeÕs isolation when turned off. C2555 is a DC block. L2552 and C2551, combined with the ÒonÓ inductance of CR2551, form a series resonant circuit to lower the shunt impedance presented by CR2551 when it is turned on.

In the receive mode, both diodes are off. Signals applied at the antenna jack J1 are routed, via the harmonic Þlter, through network L2551, C2552 and C2553 to the receiver input. In the transmit mode, 9.6T is present and both diodes are forward-biased into conduction. The transmitter RF from Q2530 is routed through CR2550, and via the harmonic Þlter to the antenna jack. CR2551 conducts, shunting RF power and preventing it from reaching the receiver. L2551 is selected to appear as a 1/4 wave at UHF, so that the low impedance of CR2551 appears as a high impedance at the junction of CR2550 and the harmonic Þlter input.

The harmonic Þlter is a seven pole 0.1 dB ripple Chebychev low pass Þlter with a 3 dB frequency of approximately 700 MHz and less than 1 dB insertion loss.

10-25 Watt UHF Power Ampliﬁer

The 10-25 watt UHF power ampliÞer is designed to cover the range of 438-470 MHz and has four stages. The Þrst stage, Q2610, operates in Class A with base bias from 9.6T. It provides 11.8 dB of gain and an output of 300 milliwatts.

The second stage, Q2620, has a nominal gain of 8.2 dB and power output of up to 2 watts. The output of this stage is adjusted by the controlled B+ voltage which supplies its collector.

The third stage, Q2630, operates in Class C with 8.1 dB gain and a power output of up to 13 watts. Collector voltage is directly from UNSW B+.

The fourth stage, Q2640, is the Þnal RF power ampliÞer, which operates Class C directly from UNSW B+. It provides up to 30 watts output. Collector current is monitored by the power control circuit by measuring the voltage drop across a .05 ohm resistor, R2670, in series with the collector DC supply lead.

The antenna switch consists of two pin diodes, CR2650 and CR2651. L2652 and C2651-2, combined with the ÒonÓ inductance of CR2651, form a series resonant circuit to lower the shunt impedance presented by

CR2651 when it is turned on. In the receive mode, both diodes are off. Signals applied at the antenna jack J1 are routed, via the harmonic Þlter, through network L2651, C2652 and C2653 to the receiver input. In the transmit mode, 9.6T is present and both diodes are forwardbiased into conduction. The transmitter RF from Q2640 is routed through CR2650, and via the harmonic Þlter to the antenna jack. CR2651 conducts, shunting RF power and preventing it from reaching the receiver. L2651 is selected to appear as a 1/4 wave at UHF, so that the low impedance of CR2651 appears as a high impedance at the junction of CR2650 and the harmonic Þlter input.

The harmonic Þlter is a seven pole 0.1 dB ripple Chebychev low pass Þlter with a 3 dB frequency of approximately 500 MHz and less than 1 dB insertion loss in the passband.

25-35/40 Watt UHF Power Ampliﬁers

There are four high-power UHF ampliÞers, which provide 25-40 watts output in the 403-433, 438-470 or 465490 MHz bands, or 25-35 watts output in the 490-520 MHz band. All have four stages and are similar in circuitry and layout.

The Þrst stage, Q2710, operates in Class A with operating voltage obtained from 9.6T. The second stage, Q2720, is a gain- controlled Class C stage, the output power of which is adjusted by varying the controlled B+ collector DC supply. The third stage, Q2730, operates in Class C with collector voltage obtained directly from UNSW B+. The fourth stage, Q2740, is the Þnal RF power ampliÞer, which operates Class C directly from UNSW B+. SpeciÞc operating parameters are:

Range 403-433 438-470 465-495 490-520

Stage 1

Gain: P

OUT

Stage 2

Gain: P

OUT

Stage 3

Gain: P

OUT

Stage 4

Gain: P

OUT

Collector current of the Þnal stage is monitored by the power control circuit by measuring the voltage drop across a .01 ohm resistor, R2770, in series with the collector DC supply lead.

The antenna switch consists of two pin diodes, CR2750 and CR2751. L2753, when used, is parallel-resonant with the off capacitance of CR2750, increasing the diodeÕs isolation when turned off. C2755 is a DC block, present if L2753 is used. L2752 and C2750-1, combined

11.8 dB

300 mW

8.2 dB

2 W

8.1 dB 13 W

5.9 dB 50 W

11.8 dB

300 mW

8.2 dB 2 W

8.1 dB

12.9 W

6.1 dB

52.8 W

10 dB

200 mW

9.5 dB

1.8 W

8.5 dB 13 W

6.3 dB 55 W

10 dB

200 mW

9.5 dB

1.8 W

8.5 dB 13 W

5.7 dB 48 W

2-12

68 No. March, 1997

Page 38

Name of Manual Theory of Operation

Front Panel Boards

with the internal ÒonÓ inductance of CR2751, form a series resonant circuit to lower the shunt impedance presented by CR2751 when it is conducting.

In the receive mode, both diodes are off. Signals applied at the antenna jack J1 are routed, via the harmonic Þlter, through network L2751, C2752 and C2753 to the receiver input. In the transmit mode, 9.6T is present and both diodes are forward-biased into conduction. The transmitter RF from Q2740 is routed through CR2750, and via the harmonic Þlter to the antenna jack. CR2751 conducts, shunting RF power and preventing it from reaching the receiver. L2751 is selected to appear as a 1/4 wave at the appropriate operating frequency range so that the low impedance of CR2751 appears as a high impedance at the junction of CR2750 and the harmonic Þlter input.

The harmonic Þlters are seven pole low pass designs having either a 0.1 dB ripple Chebychev response (403433 MHz and 438-470 MHz bands) or a Butterworth response (465-495 and 490-520 MHz). They are characterized as follows:

Range 403-433 438-470 465-495 490-520

f(-3 dB): 520 MHz 510 MHz 620 MHz 650 MHz Loss: 0.8 dB 0.8 dB 0.8 dB 0.8 dB

Front Panel Boards

The front panel housing itself contains two circuit boards, the Display Board and the Volume/Mic Board. There are two different types of Display Boards, depending on model. In 2-frequency models, discrete LEDÕs provide channel indication. In 8 or 16 frequency models, seven-segment LED displays are used.

A third board, the Front Panel Filter Board, is located on the front of the radio chassis.

Display Board

The 2-Frequency Display Board consists of four discrete LEDÕs. Two are dual color type. They indicate channel 1 or 2, and turn from green to red when the radio is in the transmit mode.

The logic board provides the following control signals:

TX/BUSY (P9-1) is ßoating in RX mode, and active low in TX mode; FPE (P9-4) supplies 5V via 10k for F2, and 0V via 10k for F1. This allows four display conditions, as follows:

¥ F1 TRANSMIT: P9-4 is low, therefore Q1003 is

off (DS1002 cannot light) and Q1001 is on (DS1001 cathodes are grounded). In transmit, P9-1 is active low, turning off Q1002 and allowing DS1001 RED to light via R1004. Also, since P9-1 is low, DS1001 GRN is shorted out and cannot light.

¥ F2 RECEIVE: P9-4 is high via 10k, therefore

Q1003 is saturated, grounding the cathodes of DS1002 and turning off Q1001. Since Q1001 is off, DS1001 cannot light. In receive, P9-1 ßoats, causing DS1002 GRN to light via R1003, and Q1002 is saturated, shorting out DS1002 RED so it doesnÕt light.

¥ F2 TRANSMIT: P9-4 is high via 10k, therefore

Q1003 is saturated, grounding the cathodes of DS1002 and turning off Q1001. Since Q1001 is off, DS1001 cannot light. In transmit, P9-1 is active low, turning off Q1002 and allowing DS1002 RED to light via R1004. Also, since P9-1 is low, DS1002 GRN is shorted out and cannot light.

DS1004 (Monitor) lights when Q1004 is saturated by 5V via 10k applied to FPD (P9-3). DS1004 (Busy) lights when Q1005 is saturated by 5V via 10k applied to FPC (P9-6).

SW1001 (Mode) and SW1002 (Monitor) are normally-open pushbuttons which provide a low to FPA (P9-7) and FPB (P9-5) respectively.

Display Board (8/16 Freq Models)

The 8/16 Frequency Display Board consists of three colored indicator LEDÕs (DS1101-3), three green LEDÕs which illuminate the keypad buttons (DS1105-7), a dual 7-segment LED display (DS1104), a display driver IC (U1101) and Þve momentary pushbuttons (SW1101-

5).

After power up, the microcomputer loads U1101 with information using the SERIAL DATA (P9-10), SERIAL CLOCK (P9-11), and DISPLAY ENABLE (P9-2) lines. This data tells U1101 which segments and indicator LEDÕs to illuminate. U1101 is a shift register latch. Its outputs are active low when a particular LED is to be illuminated, or open circuit when an LED is to remain off. The anodes of all LED indicators or segments are connected to the +5V DC source. The three keypad illumination LEDÕs are lit at all times when +5V is present.

¥ F1 RECEIVE: P9-4 is low, therefore Q1003 is off

(DS1002 cannot light) and Q1001 is on (DS1001 cathodes are grounded). In receive, P9-1 ßoats, causing DS1001 GRN to light via R1003, and Q1002 is saturated, shorting out DS1001 RED so it doesnÕt light.

March, 1997 68 No.

SW1101 through SW1105 are normally-open momentary pushbuttons. When pressed, the conductive ink on the back side of the rubber pushbutton comes in contact with the exposed circuit pattern on the display circuit board, providing a low resistance (less than 100 ohms) path to ground.

2-13

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Theory of Operation Name of Manual

Front Panel Boards

Vol/Mic Board

The VOL/MIC circuit board provides mounting and electrical connection to the microphone jack J11 and the on-off/volume control R9002. Connections are made to the logic board via P8. This cable/connector assembly also contains the two wires which route receiver audio to the internal 22 ohm speaker mounted in the front panel.

A 10 ohm resistor, R9001, is located between the CCW side of the volume control element and ground. At minimum volume setting, this maintains the attenuation at no greater than 46 dB, to avoid missing a message if the volume control is inadvertently turned to minimum.

Front Panel Filter Board

The front panel Þlter board is mounted to the front of the radio chassis. The pins of logic board connectors J8 and J9 pass through this board and are soldered to it. This board allows capacitive bypassing of all signal leads leaving the front of the radio chassis. This, combined with the shielding covers over the RF board, logic board and RF power ampliÞer, reduces the levels of cabinet radiation to extremely low levels.

In addition, the front panel Þlter board also provides protection against electrostatic discharge into front panel controls or indicators. Zener diodes are installed on any lines which are susceptible to damage from excessive static voltage transients, limiting voltage excursions to +27V or -0.7V DC.

2-14

68 No. March, 1997

Page 40

Section 3

Jumper-Selectable Options

Overview

Push-on jumpers, located on the logic board, allow the operation of the radio to be customized to speciÞc applications, as explained below. This section contains information about the possible positions for each jumper, and the corresponding options.

Jumper Positions

The standard position of each jumper, as shipped from the factory, is indicated in bold .

JU551 POSITION (A) The receiver audio applied to the accessories connector J3

(not de-emphasized) and unmuted.

JU601

JU651

POSITION (B)

POSITION (A)

POSITION (B) The high-speed receive data path to the microcomputer is essentially ßat

POSITION (A)

The receiver audio applied to the accessories connector J3 pin 11 is de-emphasized and muted. Muting is controlled by the RX MUTE output from the microcomputer, as determined by carrier or tone squelch status.

The high-speed receive data path to the microcomputer is Þltered to remove audio information below 300 Hz. This is used when decoding signaling data or tones which do not contain low frequency information.

over the frequency range of less than 1 Hz to 3 kHz. This is used when decoding signaling data which includes very low frequency components.

Selects low microphone audio sensitivity, which is 80 mV rms

of full system deviation.

POSITION (B) Selects high microphone audio sensitivity, which is 40 mV rms for 60% of

**JU701

**JU808

*JU809

*Present on 2-layer masked logic board (HLN8074) only. **Present on 4-layer expanded logic board (HLN8070) only

POSITION (A)

POSITION (B) J3-5 functions as an External PL Input, bypassing the limiter. Response is

POSITION (A)

POSITION (B) Pin 12 of accessories connector J3 functions as the SCI+ programming line.

POSITION (A)

POSITION (B) Allows the use of an HLN3145 Public Address system. Pin 14 of accesso-

full system deviation. This position is not recommended in applications where high ambient noise is present.

J3-5 functions as a Flat TX Audio Input which is routed through the limiter. Response is 0.6-3000 Hz. Sensitivity is 180 mV rms for 60% of full system deviation.

0.7-300 Hz. Pin 12 of accessories connector J3 functions as a programmable I/O (in-

put or output) as determined by the RSS.

It is connected directly to the SCI+ line on microphone connector J11. Allows the use of a remote desk set which is connected to accessories con-

nector J3. Pin 14 functions as the HOOK line. When pulled low, the radio is forced into the monitor (off-hook) position. Note that this is the opposite polarity of the HOOK function on the microphone connector J11.

ries connector J3 functions as the PA ENABLE line. In the public address mode this line is pulled low, inhibiting transmit PTT operation, but leaving all other radio functions unchanged.

Note: When a R*I*C*K Repeater adapter is used, the push-on jumper

JU809 must be removed entirely.

pin 11 is ﬂat

for 60%

March, 1997 68 No.

3-1

Page 41

Jumper-Selectable Options Name of Manual

Jumper Positions

3-2

68 No. March, 1997

Page 42

Section 4

Non-Field Servicable Components

Overview

This section explains the operation of the reference oscillator and lists all non-Þeld serviceable components in the GM300 moible radios.

Operation of the Reference Oscillator

The frequency stability of the reference oscillator in the GM300 mobile radios is maintained by electronically measuring the temperature of the oscillatorÕs crystal, computing the control voltage needed to accurately compensate for the temperature-dependent frequency shift of the crystal, and applying this voltage to the tuning varactors in the oscillator circuit.

For accurate temperature compensation, the characteristics of the oscillator and crystal are measured at the factory, and this information is programmed into the microcomputer on the logic board.

Non-Field Servicable Components

Field-replacement of the microcomputer on the logic board, or of any components in the reference oscillator or temperature-sensing circuit on the RF board, will impair the accuracy of this compensation technique. For this reason,

these components cannot be replaced in the Þeld . If any of these components require service, the entire RF or logic

board must be replaced. The Radio Service Software calibration procedure for board replacement must be performed after the new board has been installed. This step re-enters the temperature characteristic of the new oscillator into the old microcomputer, or vice-versa.

The following components are not Þeld-serviceable:

Ref. No. Part No. Description Location

_________________________________________________________________________________________________

C151 21-13740B73 chip capacitor, 1000 pF RF Board C152 21-13740B47 chip capacitor, 82 pF RF Board C153 21-13740B25 chip capacitor, 10 pF RF Board C154 21-13741B45 chip capacitor, .01 uF RF Board C155, 156 21-13740B55 chip capacitor, 180 pF RF Board C157 21-13741B45 chip capacitor, .01 uF RF Board C158 08-11051A15 poly capacitor, 0.22 uF, 63 V RF Board C159 21-13740B35 chip capacitor, 27 pF RF Board C160 21-13740B29 chip capacitor, 15 pF RF Board C161 21-13740B73 chip capacitor, 1000 pF RF Board C163 08-11051A17 poly capacitor, 0.47 uF, 63 V RF Board C164 21-13741B69 chip capacitor, 0.1 uF RF Board C165 21-13740B73 chip capacitor, 1000 pF RF Board C166 thru 168 21-13740B49 chip capacitor, 100 pF RF Board C176 21-13740B73 chip capacitor, 1000 pF RF Board C177 21-13741B69 chip capacitor, 0.1 uF RF Board CR151, 152 48-80006E10 silicon varactor SOT RF Board CR153 48-84336R03 dual silicon SOT MMBD7000 RF Board L151 24-80299D01 coil, tunable 17-3/4 turns RF Board L152 24-11087A35 chip coil, 5.6 uH, 10% RF Board Q151 48-11043C19 NPN; type M43C19/M9658 RF Board Q152 48-11043C06 PNP; type M43C06/M9643 RF Board R151 06-11077B15 chip resistor, 47k RF Board R152 06-11077B11 chip resistor, 33k RF Board R153 06-11077B15 chip resistor, 47k RF Board R154 06-11077A34 chip resistor, 22 RF Board R155 06-11077A98 chip resistor, 10k RF Board R156 06-11077B03 chip resistor, 15k RF Board R157 06-11077A78 chip resistor, 1.5k RF Board R158 06-11077A74 chip resistor, 1k RF Board R161 06-11077A98 chip resistor, 10k RF Board

March, 1997 68 No.

4-1

Page 43

Non-Field Servicable Components Name of Manual

Non-Field Servicable Components

Ref. No. Part No. Description Location

_________________________________________________________________________________________________

R176 06-11077G26 chip resistor, 22.6k, 1% RF Board R177 06-11077G18 chip resistor, 18.7k, 1% RF Board R178, 179 06-11077F91 chip resistor, 10.0k, 1% RF Board R180 06-11077G52 chip resistor, 42.2k, 1% RF Board R181 06-11077F91 chip resistor, 10.0k, 1% RF Board R182 06-11077C28 chip resistor, 23.7k, 1% RF Board U176 51-80932W01 dual op-amp RF Board VR176 48-82256C11 Zener diode, 10 V, 5% RF Board Y151 48-80174D05 crystal, 14.4 MHz RF Board U401 51-80649B01 microcomputer 2-Layer Masked Logic Board U401 51-80960T01 microcomputer 4-Layer Expanded Logic Board

4-2

68 No. March, 1997

Page 44

Parts List

HLE8230A RF Board, 403-433 MHz, 12.5 kHz (N) HLE8229A RF Board, 403-433 MHz, 25 kHz (W) PL-921021-O

REFERENCE MOTOROLA

SYMBOL PART NO. DESCRIPTION

capacitor, chip: +/-5%; 5 V:

C1, 2 21-13740G27 8.2 ± 0.1 pF C3 21-13740G17 3.9 ±0 .1 pF C4 21-13740G30 11 pF 2% C5 21-13740G21 5.6 ±0 .1 pF C6 21-13740G19 4.7 ± 0.1 pF C7 21-13740G27 8.2 ± 0.1 pF C8 21-13740G17 3.9 ± 0.1 pF C9 21-13740G21 5.6 ± 0.1 pF C10 21-13740G27 8.2 ± 0.1 pF C11 21-13740G32 13 pF 2% C12 21-13740B45 68 pF C13 21-13740G27 8.2 ± 0.1 pF C14 not used C15 21-13740G13 2.7 ± 0.1 pF C16 21-13740G20 5.1 ± 0.1 pF C17 21-13740G37 22 pF 2% C18 21-13740G19 4.7 ± 0.1 pF C19 21-13740G16 3.6 ± 0.1 pF C20 21-13740G36 20 pF 2% C21 21-13740G18 4.3 ± 0.1 pF C22 21-13740G17 3.9 ± 0.1 pF C23 21-13740G35 18 pF 2% C24 21-13740G20 5.1 ± 0.1 pF C25 21-13740G29 10 pF 2% C26 21-13740G31 12 pF 2% C27 21-11032B15 0.22 uF +80/-20% C28 21-13740B45 68 pF C29 not used C30 21-13740B35 27 pF C33 21-13741B45 .01 uF C51 21-13740B55 180 pF C52 21-13740B27 12 pF C53 21-13740B47 82 pF C54 21-13740B61 330 pF C55, 56 21-13741B45 .01 uF C57(N) 21-13740B29 15 pF C57(W) 21-13740B31 18 pF C58(N) 21-13740B25 10 pF C58(W) 21-13740B27 12 pF C59(N) 21-13740B29 15 pF C59(W) 21-13740B31 18 pF C60, 61 21-13741B45 .01 uF C65 21-11032B15 0.22 uF +80/-20% C66 21-13741B45 .01 uF C67 23-13749C39 tantalum 10 uF 10% 20V C68 21-13740B29 15 pF C69 21-13740B39 39 pF C70 21-13740B29 15 pF C71, 72 21-11032B15 0.22 uF +80/-20% C73 23-13749C39 tantalum 10 uF 10% 20V C74 23-11048B13 lytic 10 uF 20% 16V C75 21-13741B69 0.1 uF C76 23-11048B05 lytic 1 uF 20% 50V C77, 78 21-11032B15 0.22 uF +80/-20% C79 21-13741B29 .0022 uF C80 21-11032B15 0.22 uF +80/-20% C81 21-13740B55 180 pF C82, 83 21-11032B15 0.22 uF +80/-20% C84 21-13740B09 2.2 ± .25 pF C85 21-13740B25 10 pF C86, 87 21-11032B15 0.22 uF +80/-20% C90 21-13741B45 .01 uF C91 21-13740B49 100 pF C101 23-11048B13 lytic 10 uF 20% 16V C102 08-11051A13 poly 0.1 uF 63V C103 21-11032B15 0.22 uF +80/-20% C104 21-13741B45 .01 uF C105 23-11048B13 lytic 10 uF 20% 16V C106 21-13740B29 15 pF C107, 108 21-13741B69 0.1 uF C109 08-11051A13 poly 0.1 uF 63V C110 08-11051A19 poly 1 uF 63V C111 08-11051A09 poly .022 uF 63V C112 08-11051A01 poly .001 uF 63V C113 21-13741B45 .01 uF C114 21-13740B45 68 pF C115 21-13741B45 .01 uF C116 21-13740B49 100 pF C117, 118 not used C119, 120 21-13740B45 68 pF C121 21-13740B19 5.6 ± .25 pF

unless otherwise stated

HLE8230A RF Board, 403-433 MHz, 12.5 kHz (N) HLE8229A RF Board, 403-433 MHz, 25 kHz (W) PL-921021-O

REFERENCE MOTOROLA

SYMBOL PART NO. DESCRIPTION

C122 21-13740B49 100 pF C123 21-13740B45 68 pF C124 21-13740B25 10 pF C125 21-13740B73 1000 pF C126 not used C127 thru 132 21-11032B15 0.22 uF +80/-20% C133 21-13740B49 100 pF C151 21-13740B73 1000 pF C152 21-13740B47 82 pF C153 21-13740B25 10 pF C154 21-13741B45 .01 uF C155, 156 21-13740B55 180 pF C157 not used C158 08-11051A15 poly 0.22 uF 63V C159 21-13740B35 27 pF C160 21-13740B29 15 pF C161 21-13740B73 1000 pF C162 23-11048B13 lytic 10 uF 20% 16V C163 08-11051A17 poly 0.47 uF 63V C164 21-11032B15 0.22 uF +80/-20% C165 21-13741B33 .0033 uF C176 21-13740B73 1000 pF C201 23-11048B13 lytic 10 uF 20% 16V C205 21-13740B49 100 pF C206 21-13740B16 4.3 ±0 .25 pF C207 21-13740B19 5.6 ±0 .25 pF C208 21-13740B14 3.6 ±0 .25 pF C209 21-13740B14 3.6 ±0 .25 pF C210 21-13740B49 100 pF C212 21-13740B49 100 pF C213 21-13740B01 1 ±0 .25 pF C214 21-13740B13 3.3 ±0 .25 pF C215 21-13740B49 100 pF C216 21-13740B13 3.3 ±0 .25 pF C218 21-13740B49 100 pF C220 21-13740B25 10 pF C221 21-13740B05 1.5 ±0 .25 pF C222 21-13740B49 100 pF C224, 225 21-13740B49 100 pF C228 21-13741B29 .0022 uF C230, 231 21-13740B05 1.5 ±0 .25 pF C233 21-13740B18 5.1 ±0 .25 pF C234 21-13740B23 8.2 ±0 .25 pF C235 21-13740B22 7.5 ±0 .25 pF C236 21-13740B22 7.5 ±0 .25 pF C237 21-13740B49 100 pF C239 21-13740B49 100 pF C240 21-13740B05 1.5 ±0 .25 pF C242 21-13740B49 100 pF C243 21-13740B13 3.3 ±0 .25 pF C244 21-11032B15 0.22 uF +80/-20% C245 21-13740B45 68 pF C247 21-13740B23 8.2 ±0 .25 pF C248 21-13740B01 1 ±0 .25 pF C249 21-13740B49 100 pF C251 21-13740B45 68 pF C252 21-13740B49 100 pF C253 21-13740B45 68 pF C255 not used C256 21-13741B45 .01 uF C257 not used C258 08-11051A07 poly .01 uF 63V C259 21-13740B23 8.2 ±0 .25 pF C260 not used C261 21-13741B45 .01 uF C262 not used C263 21-13740B19 5.6 ± .25 pF C264 not used C265 not used C266 21-13740B03 1.2 ±0 .25 pF C267 21-13740B01 1 ±0 .25 pF C268 21-13740B13 3.3 ±0 .25 pF C269 21-13740B09 2.2 ±0 .25 pF C270, 271 not used C272 21-13740B45 68 pF C273 not used C274 21-13740B49 100 pF C275, 276 21-13741B45 .01 uF C277, 278 23-11048B19 lytic 47 uF 20% 16V C279 21-13740B45 68 pF C280 21-11032B15 0.22 uF +80/-20% C301 21-13741B45 .01 uF C302, thru 313 21-13740B45 68 pF

Page 45

HLE8230A RF Board, 403-433 MHz, 12.5 kHz (N) HLE8229A RF Board, 403-433 MHz, 25 kHz (W) PL-921021-O

REFERENCE MOTOROLA

SYMBOL PART NO. DESCRIPTION

C314 21-13740B49 100 pF

CR2 48-80154K03 dual Schottky SOT CR3 48-80939T01 Schottky SOT CR5 48-80142L01 silicon PIN SOT MMBV3401 CR51 48-05129M76 silicon SOT CR52 48-05129M76 silicon SOT CR101 48-05129M76 silicon SOT CR102 48-05129M76 silicon SOT CR151 48-80006E10 silicon varactor SOT CR152 48-80006E10 silicon varactor SOT CR153 48-84336R03 dual silicon SOT MMBD7000 CR203 48-84534N02 silicon varactor SOT CR205 48-84534N02 silicon varactor SOT CR206 48-80154K02 dual Schottky SOT CR209 48-84534N02 silicon varactor SOT CR211 48-84534N02 silicon varactor SOT CR213 48-84534N02 silicon varactor SOT CR214 48-80939T01 Schottky SOT

FL51(N) 91-80097D04 455 kHz 6F FL51(W) 91-80097D06 455 kHz 6D FL52(N) 91-80098D04 455 kHz 4F FL52(W) 91-80098D06 455 kHz 4D

J4, 5 09-80135M01 coaxial (RX) J6 09-80130M03 14-pin, RF board

JU1 thru 3 06-11077A01 jumper JU51 06-11077A01 jumper JU52 06-11077A01 jumper JU201 not used

L1 thru 7 24-84562T04 4 turns airwound L8 24-62587N42 chip 12 nH 5% L9 24-62587N44 chip 18 nH 5% L10 24-62587N54 chip 0.12 uH 5% L51 24-11030B12 7-1/2 turns YEL L52 24-62587N68 chip 1 uH 5% L53 24-62587N56 chip 0.18 uH 5% L54 24-62587N76 chip 4.7 uH 5% L55 24-80164M02 tunable 0.7 uH E715 L56 24-80164M01 tunable 0.7 uH E713 L57 24-80164M04 tunable 0.7 uH E714 L58 24-62587N76 chip 4.7 uH 5% L59 24-80164M03 tunable 0.7 uH E716 L60 24-62587N69 chip 1.2 uH 5% L61 25-80000E01 tunable 455 kHz with cap L101 24-62587N56 chip 0.18 uH 5% L102 24-62587N47 chip 33 nH 5% L151 24-80299D01 tunable 17-3/4 turns L152 24-11087A35 chip 5.6 uH 10% L202 24-80148M02 tunable 2-1/2 turns RED L203 24-62587N55 chip 0.15 uH 5% L204 24-11030A04 5 turns GRN L205 24-62587N55 chip 0.15 uH 5% L206 24-62587N55 chip 0.15 uH 5% L207 24-62587N57 chip 0.22 uH 5% L209 24-11030B05 2-1/2 turns GRN L210 24-11030B08 4-1/2 turns BRN L211 24-62587N57 chip 0.22 uH 5% L213 24-80148M01 tunable 1-1/2 turns BRN L214 24-62587N55 chip 0.15 uH 5% L215 24-11030B08 4-1/2 turns BRN L216 24-62587N55 chip 0.15 uH 5% L217 24-62587N55 chip 0.15 uH 5% L218 24-62587N57 chip 0.22 uH 5% L220 24-11030B05 2-1/2 turns GRN L221 24-11030B08 4-1/2 turns BRN L222 24-62587N56 chip 0.18 uH 5% L223 not used

Q1 48-80950X01 NPN; type M50X01 Q2 thru 5 48-05128M67 PNP; type MMBT3906 Q6 48-80214G02 NPN; type MMBT3904 Q51, 52 48-05128M66 ﬁeld effect; type MMBFU310 Q53 48-80214G02 NPN; type MMBT3904

diode: (see note)

ﬁlter:

connector, receptacle:

jumper:

coil, rf:

transistor: (see note)

HLE8230A RF Board, 403-433 MHz, 12.5 kHz (N) HLE8229A RF Board, 403-433 MHz, 25 kHz (W) PL-921021-O

REFERENCE MOTOROLA

SYMBOL PART NO. DESCRIPTION

Q101 48-05128M67 PNP; type MMBT3906 Q102, 103 48-80182D20 NPN; type M82D20/M9987 Q104 48-05128M67 PNP; type MMBT3906 Q105, 106 48-80214G02 NPN; type MMBT3904 Q107 48-11043C19 NPN; type M43C19/M9658 Q151 48-11043C19 NPN; type M43C19/M9658 Q152 48-11043C06 PNP; type M43C06/M9643 Q203 48-05128M66 ﬁeld effect; type MMBFU310 Q204, 205 48-80950X01 NPN; type M50X01 Q206 48-05128M66 ﬁeld effect; type MMBFU310 Q207, 208 48-80950X01 NPN; type M50X01 Q276 48-80214G02 NPN; type MMBT3904 Q277 thru 279 48-05128M67 PNP; type MMBT3906

resistor, ﬁxed: +/-5%; 1/10 W:

R1 06-11077A84 2.7k R2 06-11077A54 150 R3 06-11077A60 270 R4 06-11077B07 22k R5 06-11077A95 7.5k R6 06-11077A90 4.7k R7, 8 06-11077A98 10k R9 06-11077A90 4.7k R10 06-11077B07 22k R11 06-11077B15 47k R12 06-11077A45 62 R13 06-11077A65 430 R51 06-11077A44 56 R52 06-11077A54 150 R53 06-11077A88 3.9k R54 06-11077A54 150 R56 06-11077B45 820k R57 06-11077A72 820 R58 06-11077B23 100k R59 06-11077B27 150k R60 18-05500L08 variable 22k R61(N) 06-11077B07 22k R61(W) 06-11077B19 68k R62(N) 06-11077A26 10 R62(W) 06-11077B09 27k R63 06-11077B21 82k R102 06-11077A62 330 R103, 104 06-11077A98 10k R105 06-11077B11 33k R106 06-11077A73 910 R107 06-11077A78 1.5k R108, 109 06-11077A26 10 R110 06-11077B03 15k R111 06-11077A54 150 R112 06-11077A72 820 R113 06-11077A58 220 R114 06-11077A54 150 R115 06-11077A70 680 R116 06-11077A92 5.6k R118 06-11077A70 680 R119, 120 06-11077A88 3.9k R121 06-11077A84 2.7k R122 06-11077A88 3.9k R123 06-11077A74 1k R124 06-11077A78 1.5k R125 06-11077A44 56 R126 06-11077A50 100 R127 06-11077A84 2.7k R128 06-11077A72 820 R151 06-11077B15 47k R152 06-11077B11 33k R153 06-11077B15 47k R154 06-11077A34 22 R155 06-11077A98 10k R156 06-11077B03 15k R157 06-11077A78 1.5k R158, 159 06-11077A74 1k R161 06-11077A98 10k R162 not used R163(N) 06-11077B23 100k R163(W) 06-11077B17 56k R164 18-05500L08 variable 22k R165(N) 06-11077A98 10k R165(W) 06-11077B03 15k R176 06-11077G26 22.6k 1% R177 06-11077G18 18.7k 1% R178, 179 06-11077F91 10.0k 1%

unless otherwise stated

Page 46

HLE8230A RF Board, 403-433 MHz, 12.5 kHz (N) HLE8229A RF Board, 403-433 MHz, 25 kHz (W) PL-921021-O

REFERENCE MOTOROLA

SYMBOL PART NO. DESCRIPTION

R180 06-11077G52 42.2k 1% R181 06-11077F91 10.0k 1% R182 06-11077G28 23.7k 1% R207 06-11077A44 56 R208, 209 06-11077A38 33 R210 06-11077A98 10k R212 06-11077A84 2.7k R213 06-11077A72 820 R214 06-11077A50 100 R215 06-11077A84 2.7k R216 06-11077A72 820 R217 06-11077A50 100 R218 06-11077A53 130 R219 06-11077A41 43 R220 06-11077A53 130 R222 06-11077A88 3.9k R223 06-11077A94 6.8k R224 06-11077B23 100k R225 06-11077A88 3.9k R226 06-11077A44 56 R227, 228 06-11077A38 33 R229 06-11077A98 10k R231 06-11077A84 2.7k R232 06-11077A72 820 R233 06-11077A50 100 R234 06-11077A84 2.7k R235 06-11077A72 820 R236 06-11077A50 100 R237 06-11077A61 300 R238 06-11077A32 18 R239 06-11077A61 300 R240 not used R243 06-11077B23 100k R244, 245 06-11077A74 1k R246 06-11077B09 27k R276 06-11077A98 10k R277 06-11077A60 270 R278 06-11077A26 10 R279 06-11077A90 4.7k R280 06-11077A98 10k R281 06-11077A90 4.7k R301(N) 06-11077B03 15k R301(W) 06-11077A82 2.2k R302 18-05500L08 variable 22k R303 06-11077A94 6.8k

T1, 2 25-80163M02 balun

U1 48-80174R01 quad Schottky ring SOIC U51 51-05479G05 receiver system U101 51-84704M75 synthesizer U102 51-83977M45 prescaler U176 51-80932W01 dual op-amp

VR176 48-82256C11 Zener diode 10V 5%

Y51(N) 91-80022M03 ﬁlter 45.1 MHz 12.5 kHz Y51(W) 91-80022M02 ﬁlter 45.1 MHz 25 kHz Y52 48-80008K02 44.645 MHz Y151 48-80174D05 14.4 MHz

non-referenced items

26-80097M01 shield coil can (for L151) 26-80098M01 shield coil can (17 used) 26-80228L01 shield can (for J4) 26-80229L03 shield VCO frame 26-80256L02 shield image 42-80957X01 ground clip 75-05295B02 insulator (for Y151) 75-05295B07 insulator (3 used, for Y51A/B, Y52)

note: For optimum performance, diodes, transistors, and integrated circuits must be ordered by Motorola part numbers.

transformer:

integrated circuit: (see note)

voltage regulator: (see note)

crystal: (see note)

HLE8230A RF Board, 403-433 MHz, 12.5 kHz (N) HLE8229A RF Board, 403-433 MHz, 25 kHz (W) PL-921021-O

REFERENCE MOTOROLA

SYMBOL PART NO. DESCRIPTION

Page 47

Parts List

HLE8275A PA Board, 403-433 MHz, 25/40 Watt PL-921030-O

REFERENCE MOTOROLA

SYMBOL PART NO. DESCRIPTION

capacitor, chip: +/-5%; 50 V:

C2710 21-13740B49 100 pF C2711 21-13740B27 12 pF C2712 21-13740B34 24 pF C2713, 2714 21-13740B73 1000 pF C2715 21-13740B21 6.8 ±0 .25 pF C2716 21-13741B69 0.1 uF C2717 21-13740B36 30 pF C2718 21-13740B49 100 pF C2719 not used C2720, 2721 21-13740B32 20 pF C2722 thru 2725 not used C2726 21-13740B49 100 pF C2727 21-13740B73 1000 pF C2728 21-11032B15 0.22 uF +80/-20% C2729 21-13740B36 30 pF C2730 21-13740B32 20 pF C2731, 2732 21-11078B25 27 pF 100V C2733 21-11032B15 0.22 uF +80/-20% C2735 not used C2736 21-13740B49 100 pF C2737 21-13740B73 1000 pF C2738 21-13741B69 0.1 uF C2739 23-11048A17 lytic 33 uF 20% 25V C2740 21-11078B35 51 pF 100V C2745 21-80060M20 11 pF 500V C2746 21-80060M13 7 ±0 .25 pF 500V C2747 21-80060M31 33 pF 500V C2748 21-11032B15 0.22 uF +80/-20% C2749 21-13740B49 100 pF C2750 21-80060M26 20 pF 500V C2751 21-13740B17 4.7 ±0 .25 pF C2752 not used C2753 21-13740B27 12 pF C2754, 2755 21-13740B49 100 pF C2756 21-80060M20 11 pF 500V C2757 21-80060M13 7 ±0 .25 pF 500V C2758 not used C2760 21-80060M19 10 pF 500V C2761 21-80060M15 8 ±0 .25 pF 500V C2762 21-80060M17 9 ±0 .25 pF 500V C2763 21-80060M11 6 ±0 .25 pF 500V C2764 21-80060M43 100 pF 100V C2765 23-11048A17 lytic 33 uF 20% 25V C2768 not used C2770, 2771 21-13740B36 30 pF C2772 21-13740B73 1000 pF C2773 21-13741B69 0.1 uF C2774 21-13740B36 30 pF C2775 08-11051A17 poly 0.47 uF 63V C2776 21-13740B36 30 pF C2777 21-13740B73 1000 pF C2778 21-13741B69 0.1 uF C2779, 2780 21-13740B36 30 pF C2781, 2782 not used

CR2750, 2751 48-80010E01 silicon PIN UM9401 CR2770 48-80236E07 transient suppressor diode

E2722 76-83960B01 ferrite bead 1/2 turn E2770, 2771 76-83960B01 ferrite bead 1/2 turn

L2710 24-11030E02 1/2 turn RED L2711 24-11030B04 1-1/2 turns YEL L2712 24-11030E04 1/2 turn YEL L2713 24-11030B01 1-1/2 turns BRN L2714 24-80036A01 ferrite bead 1/2 turn L2720 24-11030E01 1/2 turn BRN L2721 not used L2722 24-82723H44 .039 uH L2730 24-11030A03 4 turns YEL L2731 24-80036A01 ferrite bead 1/2 turn L2732 24-11030A06 7 turns VIO L2740 24-80036A01 ferrite bead 1/2 turn L2741 24-11030A02 3 turns ORN L2742 24-80908T11 1-1/2 turns RED L2743 24-80908T01 1-1/2 turns RED L2744 not used L2750 24-82723H40 0.29 uH

unless otherwise stated

diode: (see note)

ferrite beads:

coil, rf:

HLE8275A PA Board, 403-433 MHz, 25/40 Watt PL-921030-O

REFERENCE MOTOROLA

SYMBOL PART NO. DESCRIPTION

L2751 24-11030B04 1-1/2 turns YEL L2752 24-82723H40 0.29 uH L2753 24-11030B11 6-1/2 turns ORN L2760 24-80908T08 1-1/2 turns GRN L2761 24-80908T10 1-1/2 turns GRN L2762 24-80908T11 1-1/2 turns RED L2763 24-11030B11 6-1/2 turns ORN L2770 24-82723H46 0.2 uH L2771 24-84346A02 0.23 uH

Q2710 48-82233P39 NPN; type MRF559 Q2720 48-80225C09 NPN; type MRF630

R2710 06-11077A60 270 R2711 06-11077A58 220 R2712 06-11077A52 120 R2713 06-11077A38 33 R2714 06-11077A38 33 R2715 06-11077A62 330 R2720 06-11077A26 10 R2740 not used R2741 06-02369M10 metal ﬁlm 5.6 0.6 watt R2750, 2751 06-80194M15 39 1 watt R2770 06-80147M02 metal plate .01 10% 2 watt R2771 06-11077A28 12 R2772 06-05621T02 thermistor 50k R2773 06-11077B11 33k R2774 06-11077A76 1.2k R2775 06-11077A26 10

non-referenced items

26-80158L01 heat sink (for Q2720) 26-80275M01 heat sink (2 used for CR2750 and

29-80014A03 clip coax terminal (2 used)

note: For optimum performance, diodes, transistors, and integrated circuits must be ordered by Motorola part numbers.

transistor: (see note)

resistor, chip: +/-5%; 1/10 W:

unless otherwise stated

CR2751)

Page 48

Parts List

HLN8277A PA Hardware Kit 403-433 MHz, 25/40 Watt PL-921031-O

REFERENCE MOTOROLA

SYMBOL PART NO. DESCRIPTION

C2741 21-11078B36 56 pF 100V C2742 21-11078B37 62 pF 100V C2743, 2744 21-11078B35 51 pF 100V C2766, 2767 not used

J1 09-80131M01 mini UHF coax J2 09-80255E01 power (includes feedthru)

P4 30-80138M08 coaxial cable 200 mm with plug P5 30-80138M07 coaxial cable 150 mm with plug

Q2730 48-80225C19 NPN; type MRF654 Q2740 48-80225C24 NPN; type MRF650

non-referenced items

02-00007003 nut 8-32x5/16x1/8 (for J1) 03-10943M10 screw M3x.5x8 (8 used) 03-10943M11 screw M3x.5x10 (2 used for J2) 04-00131974 washer (2 used for J2) 04-05587G01 washer nylon (for J2) 04-80943V01 lockwasher (for J1) 26-80124L03 heat sink 26-80223M07 PA shield 26-80514C01 ﬁlter shield 26-80551C01 antenna connector shield 32-80014N03 gasket, accessory connector 42-80281L01 ground clip (2 used for Q2740)

note: For optimum performance, diodes, transistors, and integrated circuits must be ordered by Motorola part numbers.

capacitor, chip:

connector, receptacle:

connector, plug:

transistor: (see note)

Page 49

6880902Z32-A

Motorola Radius Division Hwy 34, West. Mt. Pleasant, IA 52641