Table of Contents
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Technical Manual
Table of Contents
1.
General Description........................................................................................... 1
1.1
Physical Description.................................................................................. 2
1.1.1
1.2
Module Functional Description................................................................. 6
1.2.1
1.2.2
2.
Installation and Operation................................................................................ 8
2.1
Installation ................................................................................................. 8
2.2
Operation................................................................................................... 8
2.2.1
2.2.2
3.
Standard Features ........................................................................................... 11
3.1
Programmable Channel Spacing ............................................................. 11
3.2
Programmable DCS / CTCSS encoder / decoder .................................... 11
3.2.1
3.3
3.3.1
3.4
Local Channel Change ............................................................................ 11
3.4.1
4.
Options.............................................................................................................. 13
4.1
Simplex Changeover Relay ..................................................................... 13
4.1.1
4.1.2
5.
Technical Description...................................................................................... 15
5.1
Exciter Section ........................................................................................ 15
5.2
Receiver Section...................................................................................... 15
5.2.1
5.2.2
5.2.3
5.2.4
5.2.5
5.3
Power Amplifier Module......................................................................... 18
6.
SMX920 Base Station Fault Finding Procedure ........................................... 20
6.1
SMX920 Base Station ............................................................................. 20
6.1.1
6.1.2
6.2
Microcontroller Section of PCB.............................................................. 22
6.3
Receiver Module ..................................................................................... 22
6.3.1
Front Panel .................................................................................. 3
RF Module and Main Controller Assembly ................................. 6
Power Amplifier Module .............................................................. 7
Setting to Work ............................................................................. 8
Adjustments ................................................................................ 10
Description ................................................................................. 11
Description ................................................................................. 11
Description ................................................................................. 11
Description ................................................................................. 13
Installation ................................................................................. 13
General Radio Management ...................................................... 16
TX Signal Processing ................................................................. 17
RX Signal Processing ................................................................. 17
RF Power Control ...................................................................... 18
User Interface............................................................................. 18
Transmitter Section .................................................................... 20
Receiver Section ......................................................................... 21
VCO Locking .............................................................................. 22
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