E.F. Johnson Company Summit DM 975x User manual

Fifth Printing
December 2000
Supersedes 001-9750-005, 2/97
SUMMIT®DM 975X/977X
800 or 900 MHZMOBILE RADIO
MULTI-NET®II
13.6 VDC, 15 or 30 Watts
Part No. 242-97xx-111
MULTI-NET®II MOBILE
SERVICE
MANUAL

MULTI-NET®
SUMMIT®DM 975x/977x
800/900 MHz TRUNKED
RADIO
13.6 VDC, 15 or 30/35 Watts, FM
806-821 MHz Tx, 851-866 MHz Rx (975x)
896-902 MHz Tx, 935-941 MHz Rx (977x)
Part No. 242-97xx-111
Copyright © 2000 by the E.F. Johnson Company
The E.F. Johnson Company designs and manufactures two-way radio equipment to serve
a wide variety of communication needs. E.F. Johnson produces equipment for land mobile
radio and mobiletelephone services which include business, industrial, government, pub-
lic safety, and personal users.
Viking Head/EF Johnson logo, Summit®, Multi-Net®, LTR®, Viking®, Avenger®, and Call
Guard®are registered trademarks of the E.F. Johnson Company. All other company and/
or product names used in this manual are trademarks and/or registered trademarks of
their respective manufacturer.
Information in this manual is subject to change without notice.

TABLE OF CONTENTS
iRevised December 2000
Part No. 001-9750-007
TABLE OF CONTENTS
1 GENERAL INFORMATION
1.1 SCOPE OF MANUAL. . . . . . . . . . . . . . . . . . . .1-1
1.2 EQUIPMENT DESCRIPTION . . . . . . . . . . . . .1-1
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Selectable Systems and Groups . . . . . . . . . . . . . 1-1
Front and Remote Mounting . . . . . . . . . . . . . . . 1-1
NPSPAC Models (800 MHz Only) . . . . . . . . . . 1-2
1.3 PART NUMBER BREAKDOWN. . . . . . . . . . .1-2
1.4 TRANSCEIVER IDENTIFICATION . . . . . . . .1-2
1.5 ACCESSORIES. . . . . . . . . . . . . . . . . . . . . . . . .1-2
1.6 PRODUCT WARRANTY . . . . . . . . . . . . . . . . .1-5
1.7 FACTORY CUSTOMER SERVICE . . . . . . . .1-5
1.8 FACTORY RETURNS . . . . . . . . . . . . . . . . . . .1-5
1.9 REPLACEMENT PARTS. . . . . . . . . . . . . . . . .1-6
2 INSTALLATION
2.1 GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
Scope Of Instructions . . . . . . . . . . . . . . . . . . . . . 2-1
Performance Tests . . . . . . . . . . . . . . . . . . . . . . . 2-1
Transceiver Programming . . . . . . . . . . . . . . . . . 2-2
Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Selecting A Mounting Location . . . . . . . . . . . . . 2-2
2.2 TRANSCEIVER INSTALLATION. . . . . . . . . .2-2
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Mounting Transceiver . . . . . . . . . . . . . . . . . . . . 2-2
2.3 POWER CABLE INSTALLATION . . . . . . . . .2-2
2.4 ACCESSORY CABLE INSTALLATION . . . .2-3
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Internal/External Speaker. . . . . . . . . . . . . . . . . . 2-3
Ignition Sense. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Horn Alert. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
External Public Address . . . . . . . . . . . . . . . . . . . 2-4
Input B (Emergency Switch) . . . . . . . . . . . . . . . 2-4
2.5 REMOTE CONTROL UNIT INSTALLATION2-5
Setting Programming Switches . . . . . . . . . . . . . 2-5
Using Setup Mode . . . . . . . . . . . . . . . . . . . . . . . 2-7
Mounting Remote Control UniT . . . . . . . . . . . . 2-7
Using An External Speaker With A Remote
Control Unit. . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Microphone Hanger Sense . . . . . . . . . . . . . . . . . 2-8
2.6 INSTALLING OPTION SWITCH KEY CAPS2-8
2.7 INSTALLING DC NOISE FILTER KIT. . . . . .2-9
2.8 TRANSCEIVER MOUNTING TRAY
INSTALLATION. . . . . . . . . . . . . . . . . . . . . .2-10
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Locking and Unlocking Transceiver . . . . . . . . 2-10
3 OPERATION
3.1 FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.2 FRONT PANEL CONTROLS & DISPLAY. . 3-1
Front Panel Controls . . . . . . . . . . . . . . . . . . . . . . 3-1
Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.3 OPERATING MODES . . . . . . . . . . . . . . . . . . . 3-4
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Multi-Net and LTR Modes . . . . . . . . . . . . . . . . . 3-4
Conventional Mode. . . . . . . . . . . . . . . . . . . . . . . 3-4
Multi-Net and LTR System/Groups . . . . . . . . . . 3-4
3.4 SCAN (SYSTEM AND GROUP) . . . . . . . . . . 3-6
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Multiple- and Single-Site Scan . . . . . . . . . . . . . . 3-6
Scan Resume Delay. . . . . . . . . . . . . . . . . . . . . . . 3-7
Transmitting In The Scan Mode . . . . . . . . . . . . . 3-7
Fixed Transmit In Scan Mode. . . . . . . . . . . . . . . 3-8
Scan List Programming. . . . . . . . . . . . . . . . . . . . 3-8
Group Scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Scanning The Various Types Of Systems. . . . . . 3-9
3.5 OPTION SWITCH AND MENU MODE
FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
A/D (Scan List Programming) . . . . . . . . . . . . . 3-10
Auto-Registration . . . . . . . . . . . . . . . . . . . . . . . 3-10
Auxiliary 1 and 2. . . . . . . . . . . . . . . . . . . . . . . . 3-10
Backlight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Bank Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Call Guard Squelch Disable . . . . . . . . . . . . . . . 3-11
Emergency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Encryption. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
External PA . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Home System/Group. . . . . . . . . . . . . . . . . . . . . 3-11
Horn/Light Alert . . . . . . . . . . . . . . . . . . . . . . . . 3-11
LTR System Search Select . . . . . . . . . . . . . . . . 3-11
Menu Select Switch. . . . . . . . . . . . . . . . . . . . . . 3-11
Monitor Mode Select Switch. . . . . . . . . . . . . . . 3-11
Phone Mode Select . . . . . . . . . . . . . . . . . . . . . . 3-11
Priority. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Radio Sounds. . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Scan On/Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Scan List Save. . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Scan Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Status Select . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Talk-Around . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Viewing Angle . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
3.6 GENERAL FEATURES. . . . . . . . . . . . . . . . . 3-12
Time-Out Timer . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Call Indicator. . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Proceed (Clear-To-Talk) Tone . . . . . . . . . . . . . 3-13
Horn/Light Alert . . . . . . . . . . . . . . . . . . . . . . . . 3-13

TABLE OF CONTENTS (CONT’D)
ii Revised December 2000
Part No. 001-9750-007
Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Banks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Power Turn-Off Delay . . . . . . . . . . . . . . . . . . . 3-15
Emergency Calls. . . . . . . . . . . . . . . . . . . . . . . . 3-15
Programmable Power Output . . . . . . . . . . . . . . 3-16
Automatic Transmitter Thermal Foldback . . . . 3-16
Data System/Groups. . . . . . . . . . . . . . . . . . . . . 3-16
Encryption . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Phone Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Display Of Software Version . . . . . . . . . . . . . . 3-18
3.7 MULTI-NET MODE FEATURES. . . . . . . . . .3-18
Busy Queuing (Multi-Net) . . . . . . . . . . . . . . . . 3-18
Auto-Registration (Multi-Net) . . . . . . . . . . . . . 3-19
Transmitting Status Information (Multi-Net). . 3-20
Special Calls (Multi-Net) . . . . . . . . . . . . . . . . . 3-20
Transmit Inhibit . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Access Priority (Multi-Net) . . . . . . . . . . . . . . . 3-22
Camp-On Prevent. . . . . . . . . . . . . . . . . . . . . . . 3-22
3.8 LTR MODE FEATURES. . . . . . . . . . . . . . . . .3-23
Free System Ringback . . . . . . . . . . . . . . . . . . . 3-23
System Search . . . . . . . . . . . . . . . . . . . . . . . . . 3-23
Transpond. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23
Transmit Inhibit . . . . . . . . . . . . . . . . . . . . . . . . 3-23
3.9 CONVENTIONAL MODE FEATURES . . . .3-23
Transmit Disable On Busy . . . . . . . . . . . . . . . . 3-23
Call Guard Squelch. . . . . . . . . . . . . . . . . . . . . . 3-24
Monitor Mode. . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
Repeater Talk-Around . . . . . . . . . . . . . . . . . . . 3-24
Priority Group Sampling . . . . . . . . . . . . . . . . . 3-25
Receive-Only Groups. . . . . . . . . . . . . . . . . . . . 3-25
3.10 MISCELLANEOUS . . . . . . . . . . . . . . . . . . . . .3-25
Supervisory Tones . . . . . . . . . . . . . . . . . . . . . . 3-25
Display Messages. . . . . . . . . . . . . . . . . . . . . . . 3-26
3.11 TEST MODE. . . . . . . . . . . . . . . . . . . . . . . . . . .3-28
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28
Receive-Transmit-RSSI . . . . . . . . . . . . . . . . . . 3-28
Power Level 1 Set (Std Band) . . . . . . . . . . . . . 3-29
Power Level 1 Set (Talk-Around Band). . . . . . 3-30
Power Levels 2, 3, 4, 2W . . . . . . . . . . . . . . . . . 3-30
Modulation Balance . . . . . . . . . . . . . . . . . . . . . 3-30
Transmitter Hum and Noise . . . . . . . . . . . . . . . 3-30
DC Voltage Check . . . . . . . . . . . . . . . . . . . . . . 3-30
Display Test . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30
4 TRANSCEIVER PROGRAMMING
4.1 GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Programming Setup . . . . . . . . . . . . . . . . . . . . . . 4-1
Computer Description . . . . . . . . . . . . . . . . . . . . 4-1
Remote Programming Interface (RPI) . . . . . . . . 4-1
EEPROM Data Storage . . . . . . . . . . . . . . . . . . . 4-2
Software Version Number . . . . . . . . . . . . . . . . . 4-2
Computers Running Windows® . . . . . . . . . . . . 4-2
Software Installation. . . . . . . . . . . . . . . . . . . . . . 4-2
Hardware Hookup . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Minimum Free Memory Required . . . . . . . . . . . 4-3
Starting The Program . . . . . . . . . . . . . . . . . . . . . 4-3
Header Information . . . . . . . . . . . . . . . . . . . . . . . 4-3
Special Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2 MAIN MENU . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Set Up New Configuration File. . . . . . . . . . . . . . 4-5
Open Configuration File . . . . . . . . . . . . . . . . . . . 4-5
Modify Current Configuration File. . . . . . . . . . . 4-5
Upload Configuration From Radio . . . . . . . . . . . 4-6
Download Configuration To Radio. . . . . . . . . . . 4-6
Print Current Configuration File . . . . . . . . . . . . . 4-6
Modify Printer/serial Ports . . . . . . . . . . . . . . . . . 4-6
Configuration File Utilities . . . . . . . . . . . . . . . . . 4-6
4.3 MODIFY RADIO FILE MENU. . . . . . . . . . . . . 4-7
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Edit Main Radio Parameters . . . . . . . . . . . . . . . . 4-7
Define Option Buttons. . . . . . . . . . . . . . . . . . . . . 4-7
Setup Menu Functions. . . . . . . . . . . . . . . . . . . . . 4-8
Create/Edit/Copy/Delete System. . . . . . . . . . . . . 4-8
Create/Edit/Copy/Delete Bank . . . . . . . . . . . . . 4-10
Programming Prestored Telephone Numbers . . 4-11
Editing Unique ID Codes . . . . . . . . . . . . . . . . . 4-11
4.4 ADDITIONAL PROGRAMMING
INFORMATION. . . . . . . . . . . . . . . . . . . . . . 4-11
Repeater Number Programming (Multi-Net and
LTR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Channel Number Programming. . . . . . . . . . . . . 4-12
Access Priority Programming (Multi-Net Only) 4-12
Site Number Programming (Multi-Net Only). . 4-12
Specifying RIC-equipped Repeaters. . . . . . . . . 4-12
Wide Area Group Tracking Programming . . . . 4-13
4.5 PROGRAMMING ONE TRANSCEIVER WITH
ANOTHER (CLONING). . . . . . . . . . . . . . . 4-13
4.6 WRITE-ON FLASH PROGRAMMING . . . . 4-13
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Programming Files . . . . . . . . . . . . . . . . . . . . . . 4-14
Programming “A” Model Transceivers. . . . . . . 4-14
Programming Procedure . . . . . . . . . . . . . . . . . . 4-14
4.7 UNIVERSAL INTERFACE
PROGRAMMING . . . . . . . . . . . . . . . . . . . . 4-14
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Main Parameters Screen . . . . . . . . . . . . . . . . . . 4-15
System Parameters Screen. . . . . . . . . . . . . . . . . 4-16
Auxiliary and Emergency Switch Programming 4-16
5 MULTI-NET SYSTEM OVERVIEW
5.1 MULTI-NET SYSTEM COMPONENTS . . . . 5-1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Mobile Transceivers . . . . . . . . . . . . . . . . . . . . . . 5-2
Repeaters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

TABLE OF CONTENTS (CONT’D)
iii Revised December 2000
Part No. 001-9750-007
Radio Network Terminal (RNT) . . . . . . . . . . . . 5-2
Dispatch Consoles . . . . . . . . . . . . . . . . . . . . . . . 5-2
Public Switched Telephone Network (PSTN) . . 5-2
5.2 DEFINITIONS OF MULTI-NET TERMS . . . .5-3
5.3 HOME AND STATUS REPEATERS . . . . . . .5-4
5.4 HOME CHANNEL BACKUP . . . . . . . . . . . . . .5-4
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Selecting Repeater To Monitor . . . . . . . . . . . . . 5-4
Assigning The Status Channel . . . . . . . . . . . . . . 5-4
Detecting Defective Repeaters. . . . . . . . . . . . . . 5-4
5.5 MOBILE-REPEATER DATA SIGNALING . .5-5
5.6 REPEATER DATA BUS SIGNALING. . . . . .5-5
5.7 STANDARD AND SPECIAL CALLS. . . . . . .5-6
5.8 OTHER MULTI-NET FEATURES. . . . . . . . . .5-6
Unique ID Codes . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Access and Receive Priority. . . . . . . . . . . . . . . . 5-6
All Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Interrogate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Mobile Disable . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Dynamic Reprogramming of Group 11 . . . . . . . 5-7
Dynamic Move To New System/group . . . . . . . 5-7
ID Validation . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
System Key. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Dynamic Channel Assignment. . . . . . . . . . . . . . 5-8
Emergency Calls. . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Auto-registration (Roaming) . . . . . . . . . . . . . . . 5-8
Busy Queuing. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Sending Status Information . . . . . . . . . . . . . . . . 5-8
Transmit Inhibit . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Voice Encryption . . . . . . . . . . . . . . . . . . . . . . . . 5-9
6 CIRCUIT DESCRIPTION
6.1 GENERAL TRANSCEIVER DESCRIPTION 6-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Audio/Logic Board. . . . . . . . . . . . . . . . . . . . . . . 6-1
6.2 SYNTHESIZER CIRCUIT DESCRIPTION . .6-2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Voltage-Controlled Oscillator Module. . . . . . . . 6-2
VCO and TCXO Modulation . . . . . . . . . . . . . . . 6-4
Active Filter (Q800), Buffer Amplifier
(Q801, Q802) . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Prescaler (U800). . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Synthesizer Integrated Circuit (U801) . . . . . . . . 6-5
Lock Detect (Q808, Q809). . . . . . . . . . . . . . . . . 6-6
Charge Pump (Q804-Q807) . . . . . . . . . . . . . . . . 6-7
Voltage Multiplier (CR804A/B, CR805A/B). . . 6-7
6.3 RECEIVER CIRCUIT DESCRIPTION . . . . . .6-7
RF Amplifier (Q290) . . . . . . . . . . . . . . . . . . . . . 6-7
First Mixer (Q205) . . . . . . . . . . . . . . . . . . . . . . . 6-8
Crystal Filters (Z205, Z206), IF Amplifier . . . . . 6-8
Second Mixer/Detector (U200). . . . . . . . . . . . . . 6-8
Audio Power Amplifier (U100) . . . . . . . . . . . . . 6-9
13.8-Volt Switch (Q100, Q103, Q106-Q108). . . 6-9
6.4 TRANSMITTER CIRCUIT DESCRIPTION. . 6-9
Power Amplifier Module (U500) . . . . . . . . . . . . 6-9
Driver (Q500), Final Amplifier (Q501) . . . . . . . 6-9
Antenna Switch (CR502, CR506, CR507) . . . . . 6-9
Power Control (U504, Q511, Q502, Q506) . . . 6-10
6.5 AUDIO/LOGIC BOARD DIGITAL CIRCUIT
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . 6-11
Microprocessor (U401) . . . . . . . . . . . . . . . . . . . 6-11
Memory and I/O Addressing. . . . . . . . . . . . . . . 6-13
Digital Signal Processor (U300-U302) . . . . . . . 6-14
6.6 AUDIO/LOGIC BOARD RECEIVE SIGNAL
PROCESSING . . . . . . . . . . . . . . . . . . . . . . 6-14
Receive Audio Processing. . . . . . . . . . . . . . . . . 6-14
Receive Data Processing (U606A-D) . . . . . . . . 6-15
Squelch Circuit (U607B, U607C) . . . . . . . . . . . 6-15
RSSI Comparator (U602C). . . . . . . . . . . . . . . . 6-16
6.7 TRANSMIT AUDIO/DATA PROCESSING 6-16
Microphone Amplifier (U603D), Filter (U603B,
U603C, U604D). . . . . . . . . . . . . . . . . . . . . . 6-16
Mute Gate (U609C), Summing Amplifier
(U604A). . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16
Compressor (U100B), Limiter (U604C). . . . . . 6-16
Splatter Filter (U604C, U605D), Summing
Amplifier (U605A) . . . . . . . . . . . . . . . . . . . 6-17
Transmit Data Circuit (U607D, U607A). . . . . . 6-17
7 SERVICING
7.1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Periodic Checks. . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Schematic Diagrams and Component Layouts . . 7-1
Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . 7-1
Configuring Transceiver For Testing . . . . . . . . . 7-1
Surface-Mounted Components . . . . . . . . . . . . . . 7-1
CMOS Handling Techniques . . . . . . . . . . . . . . . 7-1
7.2 SYNTHESIZER TROUBLESHOOTING. . . . 7-2
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
TCXO (Y800) . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
VCO Module and Prescaler. . . . . . . . . . . . . . . . . 7-2
Synthesizer (U801) . . . . . . . . . . . . . . . . . . . . . . . 7-3
Determining Counter Divide Numbers . . . . . . . . 7-5
7.3 RECEIVER TROUBLESHOOTING. . . . . . . . 7-5
7.4 TRANSMITTER TROUBLESHOOTING. . . . 7-5
7.5 AUDIO/LOGIC BOARD
TROUBLESHOOTING . . . . . . . . . . . . . . . . 7-5
Digital Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
Analog Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
7.6 SURFACE MOUNTED DEVICES (SMDs). . 7-5
Servicing Techniques . . . . . . . . . . . . . . . . . . . . . 7-5

TABLE OF CONTENTS (CONT’D)
iv Revised December 2000
Part No. 001-9750-007
Identifying SMD Resistors. . . . . . . . . . . . . . . . . 7-5
SMD Capacitor Identification . . . . . . . . . . . . . . 7-6
SMD Inductor Identification . . . . . . . . . . . . . . . 7-7
Transistor/Diode Identification . . . . . . . . . . . . . 7-7
8 ALIGNMENT PROCEDURE AND
PERFORMANCE TESTS
8.1 GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Test Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
8.2 FREQUENCY ADJUSTMENT. . . . . . . . . . . . .8-1
8.3 TRANSMITTER TUNEUP . . . . . . . . . . . . . . . .8-2
C511 Adjustment (30 or 35 Watt Models Only) 8-2
Power Level 1 Adjustment . . . . . . . . . . . . . . . . . 8-2
Power Level 2-4, 2W Adjustment . . . . . . . . . . . 8-3
Modulation Balance . . . . . . . . . . . . . . . . . . . . . . 8-3
Transmit Data Level Adjustment . . . . . . . . . . . . 8-3
Transmit Audio Limiting Adjust . . . . . . . . . . . . 8-3
8.4 RECEIVER ALIGNMENT. . . . . . . . . . . . . . . . .8-4
Front End Alignment . . . . . . . . . . . . . . . . . . . . . 8-4
RSSI Detect Adjust. . . . . . . . . . . . . . . . . . . . . . . 8-4
Squelch Adjust . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Local Tone Level Adjust . . . . . . . . . . . . . . . . . . 8-5
8.5 RECEIVER PERFORMANCE TESTS . . . . . .8-6
8.6 TRANSMITTER PERFORMANCE TESTS. .8-6
9 PARTS LIST
RF and PA Boards, Hardware and Miscellaneous 9-1
Audio/Logic Board. . . . . . . . . . . . . . . . . . . . . . . 9-9
Front Panel Assembly. . . . . . . . . . . . . . . . . . . . 9-15
Compandor Kit. . . . . . . . . . . . . . . . . . . . . . . . . 9-16
Hardware and Cable Kit. . . . . . . . . . . . . . . . . . 9-16
Remote Control Unit and Remote Kit . . . . . . . 9-17
Accessory Wire Kit . . . . . . . . . . . . . . . . . . . . . 9-17
Transceiver Mounting Kit . . . . . . . . . . . . . . . . 9-17
Transceiver Exploded View (Part 1) . . . . . . . . 9-19
Transceiver Exploded View (Part 2) . . . . . . . . 9-20
10 SCHEMATIC DIAGRAMS AND
COMPONENT LAYOUTS
Miscellaneous
Basing Diagrams . . . . . . . . . . . . . . . . . . . . . . 10-1
Standard Amplified Dynamic Microphone . . 10-2
Transceiver-To-Transceiver Cloning Cable . 10-3
RPI (Part No. 023-9800-000) Schematic. . . . 10-3
RPI-To-Transceiver Programming Cable . . . 10-4
RPI (Part No. 023-9800-000) Board Layout . 10-4
RF and PA Board Component Locator Guide 10-5
Audio/Logic Board Comp. Locator Guide. . . 10-8
Interconnect Schematic . . . . . . . . . . . . . . . . 10-11
Display Board Schematic. . . . . . . . . . . . . . . 10-12
Display Board Layout. . . . . . . . . . . . . . . . . . 10-13
RF Board
Revised 800 MHz Schematic . . . . . . . . . . . . 10-14
800/900 MHz Board Layout. . . . . . . . . . . . . 10-15
900 MHz Schematic. . . . . . . . . . . . . . . . . . . 10-16
Unrevised 800 MHz Schematic . . . . . . . . . . 10-17
PA Board
Revised 800 MHz, 35W Schematic . . . . . . . 10-18
Revised 800 MHz, 15W Schematic . . . . . . . 10-19
Revised 800 MHz, 15W/35W Board Layout 10-20
900 MHz, 30W Schematic . . . . . . . . . . . . . . 10-21
900 MHz, 15W Schematic . . . . . . . . . . . . . . 10-22
900 MHz/Unrev. 800 MHz Board Layout . . 10-23
Unrevised 800 MHz, 35W Schematic . . . . . 10-24
Unrevised 800 MHz, 15W Schematic . . . . . 10-25
Audio/Logic Board
Schematic (Part 1 of 2). . . . . . . . . . . . . . . . . 10-26
Schematic (Part 2 of 2). . . . . . . . . . . . . . . . . 10-27
Board Layout Top View. . . . . . . . . . . . . . . . 10-28
Board Layout Bottom View . . . . . . . . . . . . . 10-29
Revised Compandor Board Schematic. . . . . 10-30
Revised Compandor Board Layout . . . . . . . 10-30
Remote Transceiver
Interconnect Schematic . . . . . . . . . . . . . . . . 10-31
Control Unit Interface Board Schematic . . . 10-32
Control Unit Interface Board Layout . . . . . . 10-33
APPENDIX A REVISION SUMMARY
A.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . A-1
A.2 TRANSCEIVER OPERATING SOFTWARE
UPDATES. . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1
A.3 REVISION LETTER CHANGES . . . . . . . . . .A-1
Transceiver Revision Letter . . . . . . . . . . . . . . . A-1
Control Unit Revision Letter. . . . . . . . . . . . . . . A-1
A.4 PROGRAMMING SOFTWARE CHANGES.A-1
A.5 REMOTE CONTROL UNIT
COMPATIBILITY. . . . . . . . . . . . . . . . . . . . . .A-3
A.6 WIDE AREA GROUP TRACKING
PROGRAMMING. . . . . . . . . . . . . . . . . . . . . . A-3
A.7 NEW FEATURES. . . . . . . . . . . . . . . . . . . . . . .A-4
Bank Start at Home Feature . . . . . . . . . . . . . . . A-4
Group Proceed Tone Delay. . . . . . . . . . . . . . . . A-4
A.8 OTHER LATE CHANGES . . . . . . . . . . . . . . .A-7

TABLE OF CONTENTS (CONT’D)
vRevised December 2000
Part No. 001-9750-007
APPENDIX B UNIVERSAL DIGITAL AND
DATA INTERFACE
B.1 GENERAL INFORMATION . . . . . . . . . . . . . . B-1
Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Universal Interface Description . . . . . . . . . . . . . B-1
B.2 POWER SUPPLY . . . . . . . . . . . . . . . . . . . . . . B-2
B.3 RECEIVE AUDIO SIGNALS . . . . . . . . . . . . . B-2
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Receive Audio Gating . . . . . . . . . . . . . . . . . . . . B-2
B.4 TRANSMIT AUDIO SIGNALS. . . . . . . . . . . . B-2
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Transmit Audio Programming . . . . . . . . . . . . . . B-2
B.5 INPUT CONTROL SIGNALS . . . . . . . . . . . . B-5
B.6 OUTPUT CONTROL SIGNALS . . . . . . . . . . B-5
B.7 INTERFACING WITH A DATA MODEM. . . B-7
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7
Modem Control Lines. . . . . . . . . . . . . . . . . . . . . B-7
ARQ Arbitration. . . . . . . . . . . . . . . . . . . . . . . . . B-7
B.8 SERIAL BUS PROTOCOL . . . . . . . . . . . . . . B-8
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-8
Physical Signal Path . . . . . . . . . . . . . . . . . . . . . . B-9
Character Level Protocol . . . . . . . . . . . . . . . . . . B-9
Message Level Protocol . . . . . . . . . . . . . . . . . . . B-9
Message Supervision Types . . . . . . . . . . . . . . . B-10
Serial Port Command Messages. . . . . . . . . . . . B-10
Response Messages . . . . . . . . . . . . . . . . . . . . . B-15
LIST OF FIGURES
2-1 97xx Front Mount Installation Components. . . . 2-1
2-2 Accessory Jack . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2-3 Remote Mount Installation Components . . . . . . 2-5
2-4 Remote Control Unit Programming Switches . . 2-7
2-5 DC Noise FIlter Installation . . . . . . . . . . . . . . . . 2-9
2-6 Locking Tray Installation Diagram . . . . . . . . . 2-10
3-1 Front Panel Controls. . . . . . . . . . . . . . . . . . . . . . 3-2
3-2 Back Panel Jacks And Connectors . . . . . . . . . . . 3-2
3-3 Front Panel Display . . . . . . . . . . . . . . . . . . . . . . 3-3
4-1 Programming Setup . . . . . . . . . . . . . . . . . . . . . . 4-1
4-2 Programming Software Menu Structure. . . . . . . 4-4
4-3 Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4-4 Modify Radio File Menu . . . . . . . . . . . . . . . . . . 4-7
4-5 Define Option Buttons Screen . . . . . . . . . . . . . . 4-9
4-6 Setup Menu Functions Screen. . . . . . . . . . . . . . 4-9
4-7 Telephone Numbers Screen. . . . . . . . . . . . . . . 4-11
4-8 Setup/Change Unique ID Screen. . . . . . . . . . . 4-11
4-9 Main Universal Interface Screen. . . . . . . . . . . 4-15
4-10 System Universal Interface Screen . . . . . . . . . 4-16
5-1 Multi-Net System Components. . . . . . . . . . . . . 5-1
6-1 Transceiver Block Diagram. . . . . . . . . . . . . . . . 6-3
6-2 U801 Block Diagram. . . . . . . . . . . . . . . . . . . . . 6-5
7-1 Simplified Synthesizer Block Diagram. . . . . . . 7-3
8-1 Test Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
8-2 Transmitter Test Setup . . . . . . . . . . . . . . . . . . . 8-2
8-3 Receiver Test Setup. . . . . . . . . . . . . . . . . . . . . . 8-4
8-4 Alignment Point Diagrams . . . . . . . . . . . . . . . . 8-5
B-1 Universal Interface Pin Designations . . . . . . . . B-1
B-2 Receive Audio Signal Routing . . . . . . . . . . . . . B-3
B-3 Transmit Audio Signal Routing . . . . . . . . . . . . B-4
B-4 Serial Bus Encode/Decode Diagram. . . . . . . . B-10
LIST OF TABLES
1-1 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1-2 E.F. Johnson Multi-Net Transceivers . . . . . . . . . 1-4
3-1 Multi-Net Standard & Spec. Call Rx Priority . . 3-6
3-2 Menu Mode And Option Switch Functions . . . . 3-9
4-1 Main Radio Parameters Screen . . . . . . . . . . . . 4-17
4-2 Multi-Net System Parameters . . . . . . . . . . . . . 4-18
4-3 LTR System Parameters . . . . . . . . . . . . . . . . . . 4-21
4-4 Conventional System Parameters . . . . . . . . . . . 4-23
4-5 Create/Edit Bank Screen Parameters . . . . . . . . 4-25
4-6 Call Guard (CTCSS/DCS) Codes and Tones . . 4-26
7-1 Ceramic SMD Capacitor Identification . . . . . . . 7-6
7-2 SMD Inductor Identification . . . . . . . . . . . . . . . 7-7
A-1 Operating Software Version Numbers . . . . . . . .A-2
A-2 Part Changes Through January 1995 . . . . . . . . .A-4
A-3 Additional Changes Through May 1998 . . . . . . A-7
B-1 Power Supply Pin Description . . . . . . . . . . . . . . B-2
B-3 Receive Audio Programming . . . . . . . . . . . . . . . B-3
B-2 Receive Audio Pin Description . . . . . . . . . . . . . B-3
B-5 Transmit Audio Programming . . . . . . . . . . . . . . B-4
B-4 Transmit Audio Pin Description . . . . . . . . . . . . . B-4
B-6 Control Signal Description . . . . . . . . . . . . . . . . . B-5
B-7 Serial Bus Pin Description . . . . . . . . . . . . . . . . . B-8
B-8 UPDATE_DISPLAY Message Coding . . . . . . B-18

1-1 Revised February 1997
Part No. 001-9750-005
GENERAL INFORMATION
SECTION 1 GENERAL INFORMATION
1.1 SCOPE OF MANUAL
This service manual contains installation, opera-
tion, programming, alignment, and service information
for the E.F. Johnson Summit®DM 975x and 977x
transceivers.
NOTE: The 900 MHz (977x) Summit DM model is no
longer available.
1.2 EQUIPMENT DESCRIPTION
1.2.1 GENERAL
The 975x/977x are full featured, high perfor-
mance transceivers that operate in the Multi-Net®,
LTR®, and conventional modes. The 975x is an 800
MHz transceiver which operates on the 760 trunked
channels from 806-824 MHz (mobile transmit). The
receive channels are 45 MHz above these frequencies
(851-869 MHz). The 977x is a 900 MHz transceiver
which operates on the 479 trunked channels from 896-
902 MHz (mobile transmit). The receive channels are
39 MHz above these frequencies (935-941 MHz).
Standard analog frequency modulation is utilized.
The last digit of the model number (97x3, 97x4,
97x5, and 97x6) denotes front or remote mounting and
power output as shown in Table 1-2. This table also
lists other E.F. Johnson Multi-Net transceivers and the
distinguishing features of each.
Like all E.F. Johnson Multi-Net and LTR trans-
ceivers, the 975/977x is digitally synthesized and logic
controlled. In the Multi-Net or LTR modes, all the user
has to do to make a call is select the desired system
and group and press the push-to- talk switch. If a busy
or out-of-range condition is not indicated by special
tones, the path to the other party is complete and
speaking can begin. Channel selection, monitoring
before transmitting, and squelch control are all
performed by the logic.
1.2.2 PROGRAMMING
Transceiver programming is performed using a
dealer-supplied personal computer and the E.F.
Johnson RPI (Remote Programming Interface) and
programming software listed in Table 1-1. Transceiver
operating parameters are stored in an EEPROM repro-
grammable memory. Refer to Section 4 for more
programming information.
The operating code (firmware) for the micropro-
cessor is stored in a flash-type memory device. This
allows the operating program to be updated using E.F.
Johnson Write-Onprogramming software and the
standard transceiver programming setup. This simpli-
fies software updates because the microprocessor or an
EPROM does not need to be changed. The latest
Write-On software and operating code can be down-
loaded from the E.F. Johnson ACESSM Bulletin Board
System. Refer to Section 4.6 for more information on
flash programming.
1.2.3 SELECTABLE SYSTEMS AND GROUPS
The maximum number of systems that can be
programmed is determined by the type of system and
the number of groups that are programmed. If only
single-group systems are programmed, up to 73 Multi-
Net, 66 LTR, or 100 conventional systems can be
programmed. Then as more groups are programmed,
the number of systems decreases. If the maximum
number of groups are programmed (11 Multi-Net, 10
LTR/conventional), up to 32 Multi-Net, 30 LTR, or 32
conventional systems can be programmed. When data
is being entered using the programming software,
there is a running indication of the amount of
EEPROM memory left.
With conventional operation, each system selects
a channel, and the group switch selects the Call Guard
(CTCSS or digital) signaling and other parameters on
that channel.
1.2.4 FRONT AND REMOTE MOUNTING
The 97x3/97x5 transceivers are designed for front
mounting within reach of the operator, and the 97x4/
97x6 are designed for remote mounting in a location
such as the trunk (see Table 1-2). The remote control
unit cable connects to the remote interface pigtail
coming from the back of the transceiver (see
Figure 2-3). This pigtail is standard with remote mount
transceivers only.

GENERAL INFORMATION
1-2 Revised February 1997
Part No. 001-9750-005
The remote control unit uses the same front panel
assembly that is used on front mount transceivers.
Therefore, it operates the same as a front-mount trans-
ceiver. A Remote Conversion Kit is available which
converts the front panel of a front mount transceiver to
a remote control unit (see Table 1-1). The remote
control unit has an internal 5-watt speaker or an
external 15-watt speaker can be used. Dual trans-
ceiver controls are also available when the remote
control unit is connected to a standard front mount
transceiver.
1.2.5 NPSPAC MODELS (800 MHZ ONLY)
All 800 MHz versions of this transceiver meet the
stricter specifications established by NPSPAC
(National Public Safety Panel Advisory Committee)
for public safety frequencies from 821-824 and 866-
869 MHz. Deviation is less on NPSPAC channels;
however, no alignment change is required because it is
automatically set for the correct level when a public
safety channel is selected (see Appendix A.2).
1.3 PART NUMBER BREAKDOWN
The following is a breakdown of the part number
used to identify this transceiver:
1.4 TRANSCEIVER IDENTIFICATION
The transceiver identification number is printed
on a label that is affixed to the bottom cover. The
following information is contained in that number:
1.5 ACCESSORIES
The accessories available for this transceiver are
listed in Table 1-2. A brief description of several of
these accessories follows.
Mounting Hardware - The mounting hardware and
DC power cable are shown in Figures 2-1 and 2-3 in
Section 2. A 22-foot DC power cable is used for both
front and remote mount applications. The cable is cut
to the required length at installation and any excess
discarded. The accessory cable is used to connect such
things as an external speaker, public address, ignition
sense input, and a horn alert to the transceiver. It
includes two 22-foot and three 2-foot wires that are
connected as required to external points. The adapter
cable is used to connect a 86xx-series power cable to
these transceivers.
Key Cap Kit - This kit includes key caps labeled for
all the functions that can be controlled by the six front
panel option switches. Also included are blank key
caps for unused switches. An extraction tool for
removing the key caps is included in the cable and
hardware kit. Refer to Section 2.6 for key cap installa-
tion information.
Lockable Mounting Tray - This bracket allows the
transceiver to be locked in place to guard against theft.
In addition, it allows it to be easily unlocked and
removed from the vehicle. Refer to Section 2.8 for
installation information.
Microphones and Speaker - The microphones in
Table 1-1 have an impedance of 620 ohms. All DTMF
microphones are backlighted. The environmentally
sealed microphones are sealed against such things as
rain, sand, and dust.
The external 15-watt speaker can be used in place
of the internal 5-watt speaker. It is non- amplified and
weatherproof. This speaker is connected to pins 1 and
2 of the accessory connector pigtail on the back of the
transceiver.
Remote Kits - The remote conversion kit converts the
front panel of a front-mount transceiver to a remote
control unit. It includes a blank cover plate with a
programming jack for the transceiver, a housing with
interface board to form the remote control unit, a
remote pigtail cable, and a 17-foot control cable. The
remote control unit uses the internal 5-watt speaker or
242 - 97 x x - 111
5 = 800 MHz
7 = 900 MHz
3 = 15W, Frt Mt
4 = 15W, Rem Mt
5 = 30/35W, Frt Mt
6 = 30/35W, Rem Mt
97xx x A 24 3 A 12345
8th
Digit Week No. Year A =
Model Revision
Letter Manufacture
Date Warranty
Number
Plant

GENERAL INFORMATION
1-3 Revised February 1997
Part No. 001-9750-005
the 15W external speaker. The remote control unit kit
includes the Summit DM control unit, remote pigtail
cable, and 17-ft. control cable. A microphone is not
included. Dual transceiver controls are provided by
connecting this control unit to a standard front mount
transceiver.
UD2I Kit - This is the Universal Digital and Data
Interface pigtail cable that installs in the transceiver to
provide connections to external data equipment. The
Validation Key is no longer required to use this inter-
face. Refer to Section 4.7 for more information.
Compandor Kit - The compandor kit includes a board
which installs in the option slots of the transceiver.
This board provides 2:1 compression of the transmit
audio and 1:2 expansion of the receive audio to mini-
mize noise in the audio signal.
NOTE: Companding is not compatible with encryp-
tion, so those features cannot be used together.
Encryption Kit - The encryption kit includes an
encryption board which installs in the option slots of
the transceiver. Voice encryption provides security
from unauthorized monitoring of conversation by
casual eavesdropping and analog scanners. Refer to
Section 5.8.16 for more information on the encryption
feature.
DC Noise Filter Kit - The DC noise filter kit includes
a filter choke that installs in the transceiver in the main
13.8-volt supply line. This filter provides additional
attenuation of vehicle electrical system noise. Installa-
tion is described in Section 2.7.
Table 1-1 ACCESSORIES
Accessory Part No.
Mounting Accessories [1]
Mounting bracket & hardware kit 023-9750-012
DC power cable & hardware, 22' 023-9750-010
Accessory cable 023-9750-011
Key cap kit, Summit 587-9650-008
Lockable Mounting Tray 585-7000-185
Adapter cable (to use 86xx-series
power cable with 97xx) 023-9650-006
Microphones
Standard amplified dynamic 250-0740-310
Standard, environ sealed 587-9650-010
DTMF w/o memory 589-0016-028
DTMF w/o mem, env seal WR805 587-9650-015
DTMF w/20 no. mem, envir seal 587-9650-012
Desk microphone 250-0742-011
External speaker, 5" 15W 3.2 ohm
environmental sealed 250-0151-006
Remote conversion kit 250-9701-001
Remote control unit kit, Summit 023-9701-002
UD2I universal interface cable
Factory installed 023-9750-001
Field installed 597-2002-245
Compandor kit
Factory installed 023-9750-002
Field installed 250-9750-002
Encryption kit
Factory installed 023-9750-003
Field installed 250-9750-003
DC noise filter kit
Factory installed 023-9750-004
Field installed 542-5010-003
Control station power supply
11 amp, 115 VAC, 60 Hz 585-4001-201
15 amp, 115 VAC, 60 Hz 585-4001-202
11 amp, 230 VAC, 50 Hz 585-4001-203
15 amp, 230 VAC, 50 Hz 585-4001-204
Programming Accessories
Remote prog interface (RPI) 023-9800-000
Cable, RPI to transceiver 023-9750-005
Cable, xcvr-xcvr (cloning) 597-2002-268
Cable, RPI to cmptr, 6’ DB9 M - DB9 F 597-5900-002
Cable, RPI to cmptr, 6’ DB25 M - DB9F 597-0005-057
PC Programming software, 3.5” diskette 023-9998-278
[1] Included with all transceivers
Table 1-1 ACCESSORIES (Continued)
Accessory Part No.

GENERAL INFORMATION
1-4 Revised February 1997
Part No. 001-9750-005
Table 1-2 E.F. JOHNSON MULTI-NET TRANSCEIVERS
Transceiver Freq
(MHz) Type Power Output
System/
Groups
[1]
M-Net/LTR/
Conv
Operation; Conv
Talk-Around
Special Features
8160 Avenger SK 800 Portable 1 & 3W 14/11 Yes Small size, Qk Sel Sw
8161 Avenger SK 800 Portable 1 & 2W 14/11 Yes Small size, Qk Sel Sw, Intrin Safe
8162 Avenger SK 900 Portable 1 & 2W 14/11 Yes Small size, Qk Sel Sw
8163 Avenger SK 900 Portable 1 & 2W 14/11 Yes Small size, Qk Sel Sw, Intrin Safe
8585 Viking CM 800 Portable 1.8/3.0W 14/11 Yes Hi Pwr, Quick Select Switch
8586 Viking CM 800 Portable 1.5/2.5W 14/11 Yes Hi Pwr, Qk Sel Sw, Intrin Safe
8587 Viking CM 800 Portable 1.8/3.0W 14/11 Yes Hi Pwr, Qk Sel Sw, NPSPAC
8588 Viking CM 800 Portable 1.5/2.5W 14/11 Yes Hi Pwr, Qk Sel, Intrin Safe, NPSPAC
8590 Viking CM 900 Portable 1W 14/11 Yes Quick Select Switch
8591 Viking CM 900 Portable 1W 14/11 Yes Qk Sel Sw, Intrin Safe
8605* 800 Frt Mount 15W 16/11 Yes Low Power
8606* 800 Frt Mount 15W 16/11 Yes Low Power, NPSPAC
8615* 800 Frt Mount 35W 16/11 Yes High Power
8616* 800 Frt Mount 35W 16/11 Yes High Power, NPSPAC
8620* 800 Rem Mount 35W 16/11 Yes High Power, Remote Mount
8621* 800 Rem Mount 35W 16/11 Yes High Pwr, Rem Mt, NPSPAC
8622* 800 Rem Mount 12W 16/11 Talk-Arnd N/A Full Duplex
8655* 900 Frt Mount 30W 16/11 Yes High Power
9753 Summit DM 800 Frt Mount 15W 32/11 Yes Hi Spec/Full Feature, Low Pwr
9754 Summit DM 800 Rem Mount 15W 32/11 Yes Hi Spec/Full Feature, Low Pwr
9755 Summit DM 800 Frt Mount 35W 32/11 Yes Hi Spec/Full Feature, Hi Pwr
9756 Summit DM 800 Rem Mount 35W 32/11 Yes Hi Spec/Full Feature, Hi Pwr
9773 Summit DM* 900 Frt Mount 15W 32/11 Yes Hi Spec/Full Feature, Low Pwr
9774 Summit DM* 900 Rem Mount 15W 32/11 Yes Hi Spec/Full Feature, Low Pwr
9775 Summit DM* 900 Frt Mount 30W 32/11 Yes Hi Spec/Full Feature, Hi Pwr
9776 Summit DM* 900 Rem Mount 30W 32/11 Yes Hi Spec/Full Feature, Hi Pwr
9883 800 Frt Mount 15 or 30W 40/16 Yes Full Featured, dual BW, high tier
9896 900 Frt Mount 15 or 30W 40/16 Yes Full Featured, high tier
[1] All except 98xx have up to 11 groups per Multi-Net system and up to 10 groups per LTR or conv system (the 98xx can
have up to 16 groups with any type of system). The 97xx and 98xx transceiver maximum number of systems is variable. The
minimum number is shown and the maximum number depends on the type and number of groups in each (see Section 1.2.3).
* Discontinued Models

GENERAL INFORMATION
1-5 Revised February 1997
Part No. 001-9750-005
Control Station Power Supply - The 11-ampere
versions are used with the 15-watt transceivers only,
and the 15-ampere models can be used with all
models. The transceiver slides into the power supply
housing and receives power from banana jacks on the
back of the power supply. The standard power cable is
used for connecting power, and the internal transceiver
speaker provides speaker audio.
Programming Hardware and Software - The RPI
provides the interface between the programming
computer and transceiver. This RPI is used for
programming both radio personality information and
the Write-On™ flash memory (see Section 1.2.2).
The cables from the RPI to the computer and
transceiver are not included with the RPI and must be
ordered separately. The transceiver programming soft-
ware is available for IBM PC or compatible computers
only. The operating parameters are programmed using
the software listed in Table 1-1, and the Write-On flash
memory is programmed using different software avail-
able on the ACESSM system (see Section 4.6). The
cloning cable allows one transceiver to program
another with identical information. Refer to Section 4
for more programming information.
1.6 PRODUCT WARRANTY
The warranty statement for this transceiver is
available from your product supplier or from the
Warranty Department, E.F. Johnson Company, 299
Johnson Avenue, P.O. Box 1249, Waseca, MN 56093-
0514. This information may also be requested from the
Warranty Department by phone as described in the
next section. The Warranty Department may also be
contacted for Warranty Service Reports, claim forms,
or any other questions concerning warranties or
warranty service.
1.7 FACTORY CUSTOMER SERVICE
The Customer Service Department of the E.F.
Johnson Company provides customer assistance on
technical problems and the availability of local and
factory repair facilities. Customer Service hours are
7:30 a.m. - 4:30 p.m. Central Time, Monday - Friday.
From within the continental United States, the
Customer Service Department can be reached at the
following toll-free number: 1-800-328-3911
When your call is answered at the E.F. Johnson
Company, you will hear a brief message informing
you of numbers that can be entered to reach various
departments. This number may be entered during or
after the message using a tone-type telephone. If you
have a pulse-type telephone, wait until the message is
finished and an operator will come on the line to assist
you. When you enter some numbers, another number
is requested to further categorize the type of informa-
tion you need. You may also enter the 4-digit exten-
sion number of the person that you want to reach if
you know what it is.
If you are calling from outside the continental
United States, the Customer Service telephone
numbers are as follows:
Customer Service Department - [phone]
Customer Service FAX Machine - [phone]
NOTE: Emergency 24-hour technical support is also
available at the 1-800 and preceding numbers during
off hours, holidays, and weekends.
You may also contact the Customer Service
Department by mail. Please include all information
that may be helpful in solving your problem. The
mailing address is as follows:
E.F. Johnson Company
Customer Service Department
299 Johnson Avenue
P.O. Box 1249
Waseca, MN 56093-0514
1.8 FACTORY RETURNS
Repair service is normally available through local
authorized E.F. Johnson Land Mobile Radio Service
Centers. If local service is not available, the equipment
can be returned to the factory for repair. However, it is
recommended that you contact the Field Service
Department before returning equipment. A service
representative may be able to suggest a solution to the
problem so that return of the equipment would not be
necessary.
Be sure to fill out a Factory Repair Request Form
#271 for each unit to be repaired, whether it is in or
out of warranty. These forms are available free of

GENERAL INFORMATION
1-6 Revised February 1997
Part No. 001-9750-005
charge by calling the repair lab (see Section 1.7) or by
requesting them when you send a unit in for repair.
Clearly describe the difficulty experienced in the space
provided and also note any prior physical damage to
the equipment. Then include a form in the shipping
container with each unit. Your phone number and
contact name are very important because there are
times when the technicians have specific questions
that need to be answered in order to completely iden-
tify and repair a problem.
When returning equipment for repair, it is also a
good idea to use a PO number or some other reference
number on your paperwork in case you need to call the
repair lab about your unit. These numbers are refer-
enced on the repair order and it makes it easier and
faster to locate your unit in the lab.
Return Authorization (RA) numbers are not
necessary unless you have been given one by the Field
Service Department. They require RA numbers for
exchange units or if they want to be aware of a specific
problem. If you have been given an RA number, refer-
ence this number on the Factory Repair Request Form
sent with the unit. The repair lab will then contact the
Field Service Department when the unit arrives.
1.9 REPLACEMENT PARTS
E.F. Johnson replacement parts can be ordered
directly from the Service Parts Department. To order
parts by phone, dial the toll-free number as described
in Section 1.7. When ordering, please supply the part
number and quantity of each part ordered. E.F.
Johnson dealers also need to give their account
number.
If there is uncertainty about the part number,
include the designator (C112, for example) and the
model number of the equipment the part is from.
You may also send your order by mail or FAX.
The mailing address is as follows and the FAX number
is shown in Section 1.7.
E.F. Johnson Company
Service Parts Department
299 Johnson Avenue
P.O. Box 1249
Waseca, MN 56093-0514

GENERAL INFORMATION
1-7 Revised February 1997
Part No. 001-9750-005
SUMMIT®DM 975x (800 MHz) SPECIFICATIONS
The following are general specifications intended for use in testing and servicing this transceiver. For current
advertised specifications, refer to the specification sheet available from the Marketing Department. Specifications
are subject to change without notice.
GENERAL
Operating Modes Multi-Net, LTR, and Conventional
Frequency Range Transmit - 806-824 MHz Std, 851-869 MHz conv talk-around
Receive - 851-869 MHz
Systems Variable from 31-100 depending on type and number of groups
Groups Up to 11 per system Multi-Net; up to 10 per system LTR and conv
Mounting Location 9753/9755 - Dash, convertible to remote mount
9754/9756 - Remote
Transmit/Receive Separation 45 MHz standard, 0 MHz conventional talk-around
Channel Spacing 25 kHz standard, 12.5 kHz offset
Channel Increment 12.5 kHz
Frequency Stability 1.5 PPM (–30°to +60°C/–22°to +140°F)
Dimensions and Weight 2.1" (5.3 cm) H, 7.2" (18.2 cm) W, 8.3" (21.1 cm) L, 5.0 lb (2.3 kg)
Power Requirement 13.6 volts, negative ground
Compliance FCC Parts 15 and 90
RECEIVER
Sensitivity (12 dB SINAD) 0.30 microvolt
Selectivity –75 dB
Intermodulation –75 dB
Spurious and Image Rejection –75 dB (–70 dB half IF)
Maximum Channel Spread 18 MHz
Audio Response 6 dB per octave de-emphasis per TIA 603 specification
Audio Power Output/Distortion 12 watts with external 4-ohm speaker, distortion less than 3%
RF Input Impedance 50 ohms
Current Drain (maximum) 1.0 ampere (standby), 3.0 ampere (rated audio output)
TRANSMITTER
RF Output Power (20% duty cycle) 9753/9754 - 15 watts (12 watts talk-around)
9755/9756 - 35 watts (30 watts talk-around)
Power Output Range 1-2 watts or 3 dB below rated (PC programmable)
Spurious and Harmonic Emissions –78 dB (35W), –75 dB (15W)
FM Hum and Noise (TIA) –48 dB
Audio Modulation 16K0F1D, 16K0F3E, 16K0F3D, 14K0F1D, 14K0F3E, 14K0F3D
Audio Distortion Less than 3% at 1 kHz
Audio Frequency Response 6 dB per octave pre-emphasis per TIA 603 specification
Maximum Channel Spread 18 MHz (no degradation); 63 MHz (talk-around .75 dB degrad)
Current Drain (maximum) 9753/9754 (15W) - 8 amperes; 9755/9756 (35W) - 15 amperes
RF Output Impedance 50 ohms
Circuit Protection 15-ampere fuse in power cable

GENERAL INFORMATION
1-8 Revised February 1997
Part No. 001-9750-005
SUMMIT®DM 977x (900 MHz) SPECIFICATIONS
The following are general specifications intended for use in testing and servicing this transceiver. For current
advertised specifications, refer to the specification sheet available from the Marketing Department. Specifications
are subject to change without notice.
GENERAL
Operating Modes Multi-Net, LTR, and Conventional
Frequency Range Transmit - 896-902 MHz Std, 935-941 MHz conv talk-around
Receive - 935-941 MHz
Systems Variable from 31-100 depending on type and number of groups
Groups Up to 11 per system Multi-Net; up to 10 per system LTR and conv
Mounting Location 9773/9775 - Dash, convertible to remote mount
9774/9776 - Remote
Transmit/Receive Separation 39 MHz standard, 0 MHz conventional talk-around
Channel Spacing 12.5 kHz
Channel Increment 12.5 kHz
Frequency Stability ±1.5 PPM (–30°to +60°C/–22°to +140°F)
Dimensions and Weight 2.1" (5.3 cm) H, 7.2" (18.2 cm) W, 8.3" (21.1 cm) L, 5.0 lb (2.3 kg)
Power Requirement 13.6 volts, negative ground
Compliance FCC Parts 15 and 90
RECEIVER
Sensitivity (12 dB SINAD) 0.30 microvolt
Selectivity –70 dB
Intermodulation –70 dB
Spurious and Image Rejection –75 dB
Maximum Channel Spread 6 MHz
Audio Response 6 dB per octave de-emphasis per TIA 603 specification
Audio Power Output/Distortion 12 watts with external 3-ohm speaker, distortion less than 3%
RF Input Impedance 50 ohms
Current Drain (maximum) 1.0 ampere (standby), 3.0 ampere (rated audio output)
TRANSMITTER
RF Output Power (20% duty cycle) 9773/9774 - 15 watts (12 watts talk-around)
9775/9776 - 30 watts (25 watts talk-around)
Power Output Range 1-2 watts or 3 dB below rated (PC programmable)
Spurious and Harmonic Emissions –67 dB (15-watt models), –70 dB (30-watt models)
FM Hum and Noise (TIA) –45 dB
Audio Modulation 11K0F3E, 11KOF1D, 11KOF3D
Audio Distortion Less than 3% at 1 kHz
Audio Frequency Response 6 dB per octave pre-emphasis per TIA 603 specification
Maximum Channel Spread 6 MHz standard and talk-around
Current Drain (maximum) 9773/9774 (15W) - 10 amperes; 9775/9776 (30W) - 15 amperes
RF Output Impedance 50 ohms
Circuit Protection 15-ampere fuse in power cable

2-1 Revised February 1997
Part No. 001-9750-005
INSTALLATION
Figure 2-1 97xx Front Mount Installation Components
Item
No. Description Part No. Item No. Description Part No.
1 Amplified dynamic mic 250-0740-310 7 Self-drilling screw (4) 575-9077-565
2 Screw, 4-20 x 5/8” thread frmg (3) 575-5604-020 8 Knob (4) 547-0016-005
3 Screw, 4-24 x 1/4” sheet metal (3) 575-3604-008 9 Power cable (22') and hardware 023-9750-010
4 Microphone hanger clip 023-3514-001 10 Accessory wire and hardware 023-9750-011
5 Mic hanger ground wire 023-7171-911 11 5" remote speaker 250-0151-006
6 Transceiver mounting bracket 017-2226-034 --- Butt splice connector (2) 586-9008-061
2.1 GENERAL
2.1.1 SCOPE OF INSTRUCTIONS
Since each installation is somewhat unique, the
following installation instructions are intended only as
a general guide to installing this transceiver. Described
are the intended use of the mounting hardware and the
electrical connections that should be made.
2.1.2 PERFORMANCE TESTS
Although each transceiver is carefully aligned
and tested at the factory, shipment can alter these
settings or damage the transceiver. Therefore, it is
good practice to check transceiver performance before
it is placed in service. Performance tests are located in
Sections 8.5 and 8.6.
SECTION 2 INSTALLATION

INSTALLATION
2-2 Revised February 1997
Part No. 001-9750-005
2.1.3 TRANSCEIVER PROGRAMMING
The transceiver needs to be programmed before it
is placed in service unless it was ordered as factory
programmed. Programming instructions are located in
Section 4. Transceivers not factory programmed are
shipped programmed with test channels and other
factory test parameters.
The control unit used with remote-mount models
does not require special programming. However, it
does have several programming switches that may
need to be changed in some circumstances. Refer to
Section 2.5 for more information.
2.1.4 POWER SOURCE
This transceiver is designed for installation only
in vehicles which have a 12-volt, negative ground
electrical system. This type of electrical system has the
negative battery terminal connected directly to the
vehicle chassis. Other types of electrical systems
require a voltage converter.
2.1.5 SELECTING A MOUNTING LOCATION
The front-mount transceivers are designed for
mounting in a location near the operator such as the
dash, console, or transmission hump. The remote-
mount transceivers are designed for mounting in a
location such as the trunk.
WARNING
The mounting location of the transceiver or control
unit can affect safe operation of the vehicle. Follow
these precautions when installing this transceiver:
•Mount it where it does not interfere with operation
of the vehicle controls.
•Mount it where the operator can easily see the
display and reach the controls.
•Mount it where it will not likely cause additional
injury in case of an accident.
2.2 TRANSCEIVER INSTALLATION
2.2.1 GENERAL
Cable and Hardware Kit, Part No. 023-9750-010,
includes a 22-foot power cable, microphone hanger,
hanger ground wire, splice connectors, and all the
hardware (such as screws) that is normally required for
installation. Transceiver Mounting Kit, Part No. 023-
9750-012, includes a mounting bracket with knobs and
mounting screws. Accessory Wire Kit, Part No. 023-
9750-011, includes a wire assembly that is used to
connect the ignition sense input and accessories. These
components are shown in Figures 2-1
and 2-3.
2.2.2 MOUNTING TRANSCEIVER
a. Check the area underneath the selected mounting
area forwiring, brake and gas lines, or other compo-
nents that could be damaged when the mounting
bracket is installed. Then install the mounting
bracket using the included self-drilling screws or
other screws if desired.
b. Install the transceiver in the bracket using the
included knobs.
c. With front-mount transceivers, install the micro-
phone hanger in a convenient location using the
screws for sheet metal or plastic. The hanger must
be connected to chassis ground for proper operation
of functions such as monitoring and scan. If
required, ground the hanger using the included
ground wire.
2.3 POWER CABLE INSTALLATION
a. Disconnect the negative cable from the battery to
prevent damage from accidental short circuits.
NOTE: Both leads of the power cable should be
connected directly to the vehicle battery. Connection
to other points may result in increased interference
from the vehicle's electrical system. If noise is still a
problem, an optional DC noise filter is available (see
Table 1-1).
b. Route the red power cable to the battery. If there is
excess cable, cut it off at a convenient location and

INSTALLATION
2-3 Revised February 1997
Part No. 001-9750-005
Figure 2-2 Accessory Jack
then splice it using the included butt splice connec-
tors. You may also need to cut the cable if it must be
routed through the firewall and there is no opening
large enough to clear the fuseholder. If a hole is
drilled in the firewall, be sure to seal it when the in-
stallation is complete.
c. Connect the red power cable to the positive (+) ter-
minal of the battery.
d. Connect the blue cable to the negative (–) battery
terminal.
e. Plug the power cable into the transceiver and recon-
nect the negative battery cable.
f. Install the antenna according to the manufacturer's
instructions. The transceiver has an “N” connector.
Check VSWR. Reflected power should be less than
4% of forward power (VSWR less than 1.5 to 1).
2.4 ACCESSORY CABLE INSTALLATION
2.4.1 GENERAL
Accessory Cable Kit, Part No. 023-9750-011, is
standard with Summit DM transceivers. This cable in
this kit plugs into the accessory pigtail coming from
the back of the transceiver. It is used for connecting
the ignition sense input and the external speaker, horn
alert, public address, and external emergency switch
accessories.
Two 8-pin connectors are included. One has a
jumper installed from pin 1 to 3 for routing audio to
the internal speaker (see next section). Also included
are two 22-foot and three 2-foot wires with attached
pins that can be used as required. Refer to Figure 2-2
and install this cable as described in the following
information.
NOTE: The ignition sense input must always be
connected because the transceiver does not operate if
it is not. In addition, the speaker jumper must be
installed to route audio to the internal speaker (except
remote-mount models).
2.4.2 INTERNAL/EXTERNAL SPEAKER
CAUTION
Do not connect either speaker output to a supply
voltage because serious damage to the audio amplifier
will result. (The amplifier is designed to withstand
momentary grounding of the speaker outputs.)
Internal Speaker
To enable the internal speaker of front-mount
transceivers, insert the plug with the jumper from pin
1 to 3 into the accessory jack. This routes the audio on

INSTALLATION
2-4 Revised February 1997
Part No. 001-9750-005
pin 1 back in to the internal speaker connected to pin
3. The other internal speaker terminal is internally
connected to pin 2.
External Speaker
With front-mount transceivers, 4-ohm, 15-watt
external speaker, Part No. 250-0151-006, or equivalent
can be connected to pins 1 and 2 of the accessory
connector. Proceed as follows:
a. Locate the connector included in the Accessory
Wire Kit that does not have pins 1 and 3 jumpered.
b. If installing the external speaker listed above, the
connector pins are already attached to the speaker
wires. Insert one pin into the pin 1 location and the
other into the pin 2 location. If installing some other
speaker, use a 2- or 22-foot wire as required.
Remote-mount Transceivers
With remote-mount transceivers, two wires
coming from the control cable connector are inserted
into the pin 1 and 2 slots to apply speaker audio to the
remote control unit. Refer to Section 2.5.3 for more
information.
2.4.3 IGNITION SENSE
This ignition sense line is pin 6 of the accessory
connector. It is connected using an included wire
assembly. When the ignition sense input is connected
to a source switched by the vehicle ignition switch, it
provides the following functions.
a. Power automatically turns on and off with the igni-
tion switch.
b. A turn-off delay can be programmed (see Section
3.6.7). An automatic turn-off delay may prevent
accidental discharge of the vehicle battery if the
transceiver is left on for extended periods (1 or 2
days). Standby current is approximately 1 ampere.
If these features are not used and transceiver
power is to be controlled by the front-panel power
switch only, the ignition sense input can be connected
to an unswitched source.
2.4.4 HORN ALERT
The horn alert feature enables the vehicle horn or
some other type of alert such as the lights when a call
is received that is programmed for this feature. For
more operation information, refer to Section 2.4.4.
When the horn alert is enabled, pin 4 of the acces-
sory connector goes low for 0.5 second and then high
for 0.5 second for three cycles. It then goes back to the
disabled mode which is a high impedance state.
Maximum sink current is 500 mA. Some type of
dealer-supplied horn alert driver is required to use this
output. To connect the horn alert driver circuit to pin 4,
use an accessory cable wire. If connecting to the coil
of a relay, a diode should be connected across the relay
coil with the cathode to the battery side. This protects
Q403 on the audio/logic board when the relay de-
energizes.
2.4.5 EXTERNAL PUBLIC ADDRESS
The speaker and microphone audio signals can be
routed to an external public address system. A Public
Address option button or menu parameter is required
to control this feature. Refer to Section 3.5.10 for
operation information.
The public address output is pin 7 of the acces-
sory connector. This AC-coupled output is limited to
300-3000 Hz. The typical output level is 2.2 V P-P,
and output impedance is less than 200 ohms. Use an
included accessory cable wire assembly to connect this
output.
2.4.6 INPUT B (EMERGENCY SWITCH)
An emergency switch can be used to set up a high
priority call (see Section 3.6.8). A front-panel option
button or an external switch such as a foot-operated
type can be used. The external emergency switch input
is pin 8 of the accessory connector. This input is active
low and has an internal pull-up resistor. Therefore, a
SPST normally open switch is used with one terminal
connected to pin 8 and the other to chassis ground.
(Chassis ground is available at pin 5 of the accessory
connector.) Use an included accessory cable wire
assembly to connect this switch. Refer to Section 4.7
for programming information.

INSTALLATION
2-5 Revised February 1997
Part No. 001-9750-005
Figure 2-3 Remote Mount Installation Components
2.5 REMOTE CONTROL UNIT INSTALLATION
2.5.1 SETTING PROGRAMMING SWITCHES
The remote control unit does not require any
programming by the computer setup described in
Section 4. However, there are DIP switches on the
control unit interface board that configure the control
unit for various applications. These switches are
factory preset and should not need to be changed when
installing a remote-mount transceiver. However, if you
want to verify the position of these switches or
Item
No. Description Part Number Item No. Description Part Number
1 Amplified dynamic mic 250-0740-310 8 Knob (4) 547-0016-005
2 Screw, 4-20 x 5/8” thrd frmg (3) 575-5604-020 9 Power cable (22') and hard 023-9750-010
3 Screw, 4-24 x 1/4” sheet metal (3) 575-3604-008 10 Accessory wire and hardware 023-9750-011
4 Microphone hanger clip 023-3514-001 11 5" remote speaker (optional) 250-0151-006
5 Mic hanger ground wire 023-7171-911 12 Plastic washer (2) 596-6400-015
6 Transceiver mounting bracket 017-2226-034 13 Stainless steel spring washer 596-9260-001
7 Self-drilling screw, 1.25" (4) 14 Knob (2) 032-0792-015
Transceiver 1/4” 575-9077-565 15 Control head mounting bracket 017-2226-050
Control unit #10 575-9077-545 16 Control cable (17') 597-2002-262