RELM SMX920 Technical Manual
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Contents
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Technical Manual Table of ContentsRELM/ BK RADIO vTable of Contents1. General Description........................................................................................... 11.1 Physical Description.................................................................................. 21.1.1 Front Panel .................................................................................. 31.2 Module Functional Description................................................................. 61.2.1 RF Module and Main Controller Assembly ................................. 61.2.2 Power Amplifier Module .............................................................. 72. Installation and Operation................................................................................ 82.1 Installation................................................................................................. 82.2 Operation................................................................................................... 82.2.1 Setting to Work ............................................................................. 82.2.2 Adjustments ................................................................................ 103. Standard Features ........................................................................................... 113.1 Programmable Channel Spacing ............................................................. 113.2 Programmable DCS / CTCSS encoder / decoder .................................... 113.2.1 Description................................................................................. 113.3 Local Speaker, Mic Socket and Front Panel Mute / Squelch Controls ... 113.3.1 Description................................................................................. 113.4 Local Channel Change ............................................................................ 113.4.1 Description................................................................................. 114. Options.............................................................................................................. 134.1 Simplex Changeover Relay..................................................................... 134.1.1 Description................................................................................. 134.1.2 Installation ................................................................................. 135. Technical Description...................................................................................... 155.1 Exciter Section ........................................................................................ 155.2 Receiver Section...................................................................................... 155.2.1 General Radio Management ...................................................... 165.2.2 TX Signal Processing ................................................................. 175.2.3 RX Signal Processing ................................................................. 175.2.4 RF Power Control ...................................................................... 185.2.5 User Interface............................................................................. 185.3 Power Amplifier Module......................................................................... 186. SMX920 Base Station Fault Finding Procedure ........................................... 206.1 SMX920 Base Station ............................................................................. 206.1.1 Transmitter Section .................................................................... 206.1.2 Receiver Section ......................................................................... 216.2 Microcontroller Section of PCB.............................................................. 226.3 Receiver Module ..................................................................................... 226.3.1 VCO Locking.............................................................................. 22 |
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