Technical Manual Table of Contents
© SPECTRA ENGINEERING 2022 Revision 1.0.0
Table of Contents
1. 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
2. Installation and Operation................................................................................ 8
2.1 Installation................................................................................................. 8
2.2 Screw Head Types..................................................................................... 9
2.3 Operation................................................................................................. 10
2.3.1 Setting to Work........................................................................... 10
2.3.2 Adjustments ................................................................................ 11
3. Options.............................................................................................................. 12
4. Alignment and Testing.................................................................................... 13
4.1 Transceiver Setup, Calibration and Alignment ....................................... 13
4.1.1 Setting the Model Number and Serial Number .......................... 13
4.1.2 Setting the Configuration Information....................................... 13
4.1.3 Adding and Setting Channel Alignments.................................... 13
4.1.4 Setting CTCSS/DCS.................................................................... 14
4.1.5 Power Calibration...................................................................... 14
4.1.6 RSSI Calibration ........................................................................ 14
4.1.7 Temperature Calibration............................................................ 15
4.1.8 TX Power Adjustment................................................................. 15
4.1.9 Peak Deviation and Modulation Balance Alignment................. 15
4.1.10 TX Centre Frequency Alignment................................................ 16
4.1.11 Nominal Deviation ..................................................................... 17
4.1.12 Mute Threshold Setting .............................................................. 17
5. Appendices ....................................................................................................... 18
5.1 MX940 Interface Connections ................................................................ 18
5.2 Rear interface Board................................................................................ 18
5.2.1 Rear User Interface.................................................................... 18
5.2.2 CN4 Pinouts ............................................................................... 19
5.3 MX940 Specifications............................................................................. 20
5.3.1 Operating Frequency Bands ...................................................... 20
5.3.2 General....................................................................................... 21
5.3.3 Transmit ..................................................................................... 22
5.3.4 Receive ....................................................................................... 23
5.3.5 Ancillaries .................................................................................. 23
5.4 MX940 Model Number Configuration Guide......................................... 24
