RELM BK RADIO SDMX920 User manual

Base Station and Repeater

SMX920

SDMX920

VER. 1.1.4

0300-30973-700_REV 07-14

Technical Manual

MX920 Base Station & Repeater

RELM

Wireless

por

ion

7100 Technology

Drive

West Melbourne, FL

32904

Front Desk: (321)

984-1414

Sales: (800)

821-2900

Service: (800)

422-6281

www.RELM.com

In order to continually improve our products, Spectra Engineering Pty Ltd reserves the right to

alter, without notice and at any time, the equipment and specifications described in this

document.

All performance figures quoted are typical and are subject to normal manufacturingand

service tolerances.

The purchaser is warned that some statements made in this document may be inaccurate due to

typographical or other errors or subsequent modifications of the product. While every care has

been taken in the creation of this document, no warranty of accuracy or reliability is given, in

any advice or information contained in this document. Spectra Engineering Pty Ltd or any

director, officer, agent or employee of Spectra Engineering Pty Ltd cannot be held liable

for any

loss or damage whatsoever arising in any way or any representation,act or omission whether

express or implied (including responsibility to any person by reason of negligence).

This work is copyright. Other than as permitted by Law, no part of it may be reproduced,

stored in a retrieval system or transmitted in any form or by any process without prior written

permission.

FCC Interference

Warning

Note: The equipment has been tested and found to comply with the limits for a class B digital

device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable

protection against harmful interference when the equipment is operated in a commercial or

residential environment. This equipment generates, uses and can radiate radio frequency

energy. If not installed and used in accordance with this instruction manual, may

cause

harmful

interference to radio communication.

MX920 Base Station & Repeater

Technical Manual

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Technical Manual

MX920 Base Station & Repeater

Record Of Changes

Any changes to this manual are recorded on this list. Spectra Engineering may issue

replacement pages to you from time to time. If any updates are issued, you will also

receive a replacement for this page.

Date Version Chapter Changes Pages Changed

Mar 2003 1.0.0 All - Initial Release All

June 2004 1.1.0 General Revision All

Sept 2004 1.1.1 Changes to Table 8-4 Rs232 Pin

configuration 33

19/10/06 1.1.2 Added Screw Head Types section

2.2 8

22/01/07 1.1.3 Updated RJ45 line level spec's 33

21/01/07 1.1.4 Updated Calibration Section 7 29

MX920 Base Station & Repeater

Technical Manual

SAFETY SUMMARY

Only the MX920’s self contained power supply, if installed, contains dangerous mains

voltages within. Normal operation and use of the MX920 does not expose the operator or

service technician to high voltage parts. The power supply is isolated from and maybe

removed safely from the main chassis. For servicing, please return to your nearest

distributor. No fuses or user-serviceable parts are within the power supply module.

The following general safety precautions as would normally apply, should be observed

during all phases of operation, service and repair of this equipment.

AROUND THE EQUIPMENT

To minimise any possible shock hazard from an external power supply or lightning strike, the

chassis or equipment cabinet must be connected to an electrical ground. This is normally

achieved by the Earth grounding wire within the 3 wire mains cable. Provide adequate

ventilation around the rear of the equipment.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE

Do not operate the equipment in the presence of flammable gases or fumes. Operation of

any electrical equipment in such an environment constitutes a definite safety hazard.

DO NOT ATTEMPT INTERNAL SERVICE WHILE TRANSMITTING

Thermal or RF burns may result from touching certain components within the power

amplifier module while transmittingor operating the transmitter.

DO NOT SUBSTITUTE PARTS OR MODIFY THE EQUIPMENT

Because of the danger of introducingadditional hazards, do not install substitute or lower

voltage parts to the equipment. Return to your authorised distributor.

EXERCISE CAUTION AND CORRECT DISPOSAL OF RF POWER DEVICES Most

RF power transistors and some RF power hybrids contain Beryllium Oxide. Although they

are normally safe, if physically damaged toxic dust may be released. Consult your local

authority for correct disposal thereof. Such devices are not normally used in the MX920.

WARRANTY CONDITIONS & PRECAUTIONS

The following conditions are not covered by the warranty of the MX920. Please ensure that

the MX920 is not subject to;

1. Over voltage or Reverse Power Supply Voltage.

2. Operation in locations subject to abnormal environmental conditions such as extreme

temperatures or ingress of moisture or excessively dusty environments.

3. Operation of the MX920 Transmitter output into an open or short circuit or an incorrectly

terminated load. Although a level of VSWR protection is included, greater protection is

provided by the addition of a TX RF isolator.

Technical Manual

Table of Contents

1. General

Description...........................................................................................

1.1 Physical

Description..................................................................................

1.1.1 Front Panel

..................................................................................

1.2 Module Functional

Description

.................................................................

1.2.1 RF Module and Main Controller Assembly

.................................

1.2.2 Power Amplifier

Module..............................................................

2. Installation and

Operation................................................................................

2.1

Installation

.................................................................................................

2.2 Screw Head

Types.....................................................................................

2.3

Operation

...................................................................................................

2.3.1 Setting to

Work

.............................................................................

2.3.2

Adjustments ................................................................................

3. Standard Features

...........................................................................................

3.1 Programmable Channel

Spacing .............................................................

3.2 Programmable DCS / CTCSS encoder /

decoder

....................................

3.2.1

Description

.................................................................................

3.3 Local Speaker, Mic Socket and Front Panel Mute / Squelch Controls... 12

3.3.1

Description

.................................................................................

3.4 Local Channel Change

............................................................................

3.4.1

Description

.................................................................................

Options..............................................................................................................

4.1 Simplex Changeover

Relay

.....................................................................

4.1.1

Description

.................................................................................

4.1.2 Installation

.................................................................................

4.2 U29 Balanced and Isolated VF plus E&MError!Bookmark not defined.

5. Technical

Description

......................................................................................

5.1 Exciter Section

........................................................................................

5.2 Receiver

Section......................................................................................

5.2.1 General Radio Management

......................................................

5.2.2

TX Signal

Processing .................................................................

5.2.3

RX Signal

Processing

.................................................................

5.2.4

RF Power

Control......................................................................

5.2.5

User

Interface.............................................................................

5.3 Powe

r A

mplifier

Module.........................................................................

6. MX920 Base Station Fault Finding Procedure

.............................................

6.1 MX920 Base Station

...............................................................................

6.1.1 Transmitter Section

....................................................................

6.1.2 Receiver

Section.........................................................................

6.2 Microcontroller Section of

PCB

..............................................................

MX920 Base Station & Repeater

Technical Manual

6.3.1 VCO 23

6.3.2 RX Front End 23

6.3.3 IF Section 23

6.4 Excit r 24

6.4.1 VCO 24

6.4.2 RF 24

6.5 Powe

6.3 Receiver

Section......................................................................................

7. Alignment and

Testing....................................................................................

7.1 Transceiver Setup, Calibration and

Alignment ....................................... 27

7.1.1 Setting the Model Number and Serial

Number...........................

7.1.2 Setting the Configuration

Information .......................................

7.1.3 Adding and Setting Channel

Alignments

....................................

7.1.4 Setting

CTCSS/DCS....................................................................

7.1.5 Power

Calibration

......................................................................

7.1.6 RSSI Calibration

........................................................................

7.1.7 Temperature

Calibration............................................................

7.1.8 TX Power

Adjustment

.................................................................

7.1.9 Peak Deviation and Modulation Balance

Alignment

.................29

7.1.10 TX Centre Frequency

Alignment

................................................

7.1.11 Microphone Line Input Level (Nominal Deviation Or Peak

Deviation

Mode)........................................................................

7.1.12 Mute Threshold Setting

..............................................................

8. Appendices

.......................................................................................................

8.1 MX920 Interface Connections

................................................................ 32

8.1.1 CN6 Simplex

Relay

.....................................................................

8.1.2 CN7 TX

Output

...........................................................................

8.2 MX920 Test

Points.................................................................................. 34

8.3 Establishing RS232

Communications

..................................................... 35

8.3.1 Software Menu

System................................................................

8.3.2 Interfacing

Information

..............................................................

8.4 MX920

Specifications

............................................................................. 37

8.4.1 Operating Frequency Bands

......................................................

8.4.2

General

.......................................................................................

8.4.3 Transmit

.....................................................................................

8.4.4 Receive

.......................................................................................

8.4.5 Ancillaries

..................................................................................

8.5 MX920 Model Number Configuration

Guide

......................................... 41

Technical Manual

Table of Contents

List of Tables

Table 1-1 LED

Functions ................................................................................................

Table 1-2 Rear Panel

Connections..................................................................................

Table 2-1 Micro Controller

Jumper..............................................................................

Table 5-1 Microprocessor Port

Parameters..................................................................

Table 7-1 Peak Deviation Settings

................................................................................

Table 7-2 Nominal

Deviation ........................................................................................

Table 8-1 MX920 Interface

Connectors........................................................................

Table 8-2 MX920 Accessory Socket

Pinout...................................................................

Table 8-3 MX920 Test

Points.........................................................................................

Table 8-4 Rs232 Pin configuration

................................................................................

Table 8-5 General

Specifications ..................................................................................

Table 8-6 Transmit

Specifications

.................................................................................

Table 8-7 Receive

Specifications

...................................................................................

Table 8-8 Ancilary

Specifications..................................................................................

Table 8-9 MX920 frequencies

bands

..............................................................................

MX920 Base Station & Repeater

Technical Manual

List of Figures

Figure 1-1 MX920 Horizontal andVvertical types of Front Panel

LEDs.........................

Figure 1-2 MX920 Rear Panel with Power Supply and Duplexer

fitted.

........................

Figure 7-1 Under (increase

level)

.................................................................................

Figure 7-2 Over (decrease

level)...................................................................................

Figure 7-3 Correctly Aligned

Waveform

.......................................................................

Figure 8-1 RJ45 socket viewed from front of

MX920....................................................

Figure 8-2 Front veiw of DB9 female connector and RJ45 Modular male

connector

... 36

Figure 8-3 RS232

Cable

.................................................................................................

Table of contents

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