Spectra Engineering MX800 - Options (continued); 3.6 T06 Simplex Changeover Relay; 3.7 T07 Turn Around Mixer; 3.8 T08 VF Delay

Technical Manual Table of Contents
© SPECTRA ENGINEERING 2006 Revision 4.2.3
vii
4.4 Micro Controller Board..............................................................69
4.4.1 Overall Radio Management ..........................................70
4.4.2 TX Signal Processing ....................................................71
4.4.3 RX Signal Processing....................................................72
4.4.4 RF Power Control.........................................................72
4.4.5 User Interface................................................................73
5. Alignment and Testing..........................................................................74
5.1 Transceiver Setup, Calibration and Alignment..........................74
5.1.1 Sending Model Number and Serial Number to the
Radio .............................................................................74
5.1.2 Sending Configuration Information ..............................75
5.1.3 Sending Channel Information .......................................75
5.1.4 Setting Alignment Channel............................................75
5.1.5 Power Calibration......................................................... 76
5.1.6 RSSI Calibration ...........................................................76
5.1.7 Temperature Calibration...............................................76
5.1.8 TX Power Adjustment....................................................76
5.1.9 Peak Deviation and Modulation Balance .....................77
5.1.10 TX Centre Frequency Alignment...................................79
5.1.11 TX Line Input Level and Nominal Deviation
Alignment ...................................................................... 79
5.1.12 RX Line Output Level Adjustment .................................82
5.1.13 TX VF Loop Back Level ................................................82
5.1.14 Mute Threshold Setting .................................................82
5.2 Module Level Test Procedures...................................................83
5.2.1 Exciter Module..............................................................83
5.2.2 Receiver Module............................................................84
5.2.3 Power Amplifier Module ...............................................86
5.2.4 VCO Board....................................................................87
5.2.5 Microcontroller Module................................................88
6. MX800 Base Station Fault Finding Procedure...................................90
6.1 MX800 Base Station ..................................................................90
6.1.1 Transmitter Section .......................................................90
6.1.2 Receiver Section............................................................91
6.2 Microcontroller PCB..................................................................92
6.3 Receiver Module ........................................................................92
6.3.1 VCO Locking.................................................................92
6.3.2 RX Front End ................................................................92
6.3.3 IF Section ......................................................................93
6.4 Exciter Module...........................................................................93
6.4.1 VCO Locking.................................................................93
6.4.2 RF Power ......................................................................93