RELM SMX920 Manuale utente

Base Station and Repeater

Technical Manual

SMX920

Technical Manual SMX920 Base Station & Repeater

Revision 08-05 i

RELM Wireless Corporation

7100 Technology Drive

West Melbourne, FL 32904

Front Desk: (321) 984-1414

Sales: (800) 821-2900

Service: (800) 422-6281

www.relm.com

Manual Revision 08-05

In order to continually improve our products, Spectra Engineering Pty Ltd and RELM

Wireless Corporation 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 manufacturing and

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.

SMX920 Base Station & Repeater Technical Manual

Revision 08-05

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Technical Manual SMX920 Base Station & Repeater

Revision 08-05 iii

Record Of Changes

Any changes to this manual are recorded on this list. RELM Wireless 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 Figure 1-1 34

SMX920 Base Station & Repeater Technical Manual

Revision 08-05

SAFETY SUMMARY

Only the SMX920’s self contained power supply, if installed, contains dangerous mains

voltages within. Normal operation and use of the SMX920 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 transmitting or operating the transmitter.

DO NOT SUBSTITUTE PARTS OR MODIFY THE EQUIPMENT

Because of the danger of introducing additional 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 SMX920.

WARRANTY CONDITIONS & PRECAUTIONS

The following conditions are not covered by the warranty of the SMX920. Please ensure

that the SMX920 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 SMX920 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

RELM/

BK RADIO

Table of Contents

General Description........................................................................................... 1

1.1

Physical Description.................................................................................. 2

1.1.1

Front Panel .................................................................................. 3

1.2

Module Functional Description................................................................. 6

1.2.1

RF Module and Main Controller Assembly ................................. 6

1.2.2

Power Amplifier Module .............................................................. 7

Installation and Operation................................................................................ 8

2.1

Installation................................................................................................. 8

2.2

Operation................................................................................................... 8

2.2.1

Setting to Work ............................................................................. 8

2.2.2

Adjustments ................................................................................ 10

Standard Features ........................................................................................... 11

3.1

Programmable Channel Spacing ............................................................. 11

3.2

Programmable DCS / CTCSS encoder / decoder .................................... 11

3.2.1

Description................................................................................. 11

3.3

Local Speaker, Mic Socket and Front Panel Mute / Squelch Controls ... 11

3.3.1

Description................................................................................. 11

3.4

Local Channel Change ............................................................................ 11

3.4.1

Description................................................................................. 11

Options.............................................................................................................. 13

4.1

Simplex Changeover Relay..................................................................... 13

4.1.1

Description................................................................................. 13

4.1.2

Installation ................................................................................. 13

Technical Description...................................................................................... 15

5.1

Exciter Section ........................................................................................ 15

5.2

Receiver Section...................................................................................... 15

5.2.1

General Radio Management ...................................................... 16

5.2.2

TX Signal Processing ................................................................. 17

5.2.3

RX Signal Processing................................................................. 17

5.2.4

RF Power Control ...................................................................... 18

5.2.5

User Interface............................................................................. 18

5.3

Power Amplifier Module......................................................................... 18

SMX920 Base Station Fault Finding Procedure ........................................... 20

6.1

SMX920 Base Station ............................................................................. 20

6.1.1

Transmitter Section .................................................................... 20

6.1.2

Receiver Section ......................................................................... 21

6.2

Microcontroller Section of PCB.............................................................. 22

6.3

Receiver Module ..................................................................................... 22

6.3.1

VCO Locking.............................................................................. 22

SMX920 Base Station & Repeater Technical Manual

RELM/ BK RADIO

6.3.2

RX Front End ............................................................................. 22

6.3.3

IF Section ................................................................................... 22

6.4

Exciter Module........................................................................................ 23

6.4.1

VCO Locking .............................................................................. 23

6.4.2

RF Power.................................................................................... 23

6.5

Power Amplifier ...................................................................................... 23

Alignment and Testing .................................................................................... 26

7.1

Transceiver Setup, Calibration and Alignment ....................................... 26

7.1.1

Setting the Model Number and Serial Number in the Radio ...... 26

7.1.2

Setting the Configuration Information ....................................... 26

7.1.3

Adding and Setting Channel Alignments.................................... 26

7.1.4

Setting CTCSS/DCS.................................................................... 27

7.1.5

Power Calibration...................................................................... 27

7.1.6

RSSI Calibration ........................................................................ 27

7.1.7

Temperature Calibration............................................................ 27

7.1.8

TX Power Adjustment................................................................. 28

7.1.9

Peak Deviation and Modulation Balance Alignment ................. 28

7.1.10

TX Centre Frequency Alignment................................................ 29

7.1.11

Microphone Line Input Level (Nominal Deviation Or Peak

Deviation Mode)........................................................................ 29

7.1.12

Mute Threshold Setting .............................................................. 30

Appendices ....................................................................................................... 31

8.1

SMX920 Interface Connections .............................................................. 31

8.1.1

CN6 Simplex Relay..................................................................... 32

8.1.2

CN7 TX Output........................................................................... 32

8.2

SMX920 Test Points ............................................................................... 32

8.3

Establishing RS232 Communications ..................................................... 33

8.3.1

Software Menu System................................................................ 34

8.3.2

Interfacing Information .............................................................. 35

8.4

SMX920 Specifications........................................................................... 35

8.4.1

Operating Frequency Bands ...................................................... 35

8.4.2

General....................................................................................... 36

8.4.3

Transmit ..................................................................................... 37

8.4.4

Receive ....................................................................................... 38

8.4.5

Ancillaries .................................................................................. 38

8.5

SMX920 Model Number Configuration Guide....................................... 39

Technical Manual Table of Contents

RELM/

BK RADIO

vii

List of Tables

Table 1-1 LED Functions ................................................................................................ 4

Table 1-2 Rear Panel Connections.................................................................................. 5

Table 2-1 Micro Controller Jumper ................................................................................ 9

Table 5-1 Microprocessor Port Parameters.................................................................. 16

Table 7-1 Peak Deviation Settings ................................................................................ 28

Table 7-2 Nominal Deviation ........................................................................................ 30

Table 8-1 SMX920 Interface Connectors ...................................................................... 31

Table 8-2 SMX920 Accessory Socket Pinout................................................................. 31

Table 8-3 SMX920 Test Points ....................................................................................... 32

Table 8-4 Rs232 Pin configuration ................................................................................ 33

Table 8-5 General Specifications .................................................................................. 36

Table 8-6 Transmit Specifications................................................................................. 37

Table 8-7 Receive Specifications................................................................................... 38

Table 8-8 Ancilary Specifications.................................................................................. 38

Table 8-9 SMX920 frequencies bands ............................................................................ 39

SMX920 Base Station & Repeater Technical Manual

RELM/ BK RADIO

viii

List of Figures

Figure 1-1 SMX920 Horizontal andVvertical types of Front Panel LEDs....................... 3

Figure 1-2 SMX920 Rear Panel with Power Supply and Duplexer fitted. ...................... 5

Figure 7-1 Under (increase level) ................................................................................. 29

Figure 7-2 Over (decrease level)................................................................................... 29

Figure 7-3 Correctly Aligned Waveform....................................................................... 29

Figure 8-1 RJ45 socket viewed from front of SMX920.................................................. 31

Figure 8-2 Front veiw of DB9 female connector and RJ45 Modular male connector... 34

Figure 8-3 RS232 Cable................................................................................................. 34

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