User's Manual
Table Of Contents
- 1. General Description
- 2. Installation and Operation
- 3. Options
- 3.1 T01 Programmable Channel Spacing
- 3.2 T02 Programmable CTCSS encoder/decoder
- 3.3 T03 Programmable DCS/CTCSS encoder/decoder
- 3.4 T05 Balanced and Isolated VF plus E&M
- 3.5 T06 Simplex Changeover Relay
- 3.6 T08 VF Delay
- 3.7 T09 300Hz Upgrade HPF Filter
- 3.8 T10 Power Save Mode
- 3.9 T11 Combined Options
- 3.10 T12 External Reference Oscillator Input
- 3.11 T13 Local Speaker, Mic Socket and Front Panel Mute
- 3.12 T14 Local Channel Change
- 3.13 T16 1PPM Frequency Stability
- 3.14 U69 Extended Temperature Range Verification
- 3.15 T19/26 Line Interface Board.
- 3.16 T29 Balanced and Isolated VF plus E&M
- 3.17 T31 Network Adapter
- 3.18 T34 Ethernet option
- 3.19 T36 Option - TX Ref Oscillator input and Modulator
- 6. MX800 Base Station Fault Finding Procedure
- 7. Appendices
- 7.1 MX800 Interface Connections
- 7.2 CN2 DB9 Female Monitor Connector
- 7.3 CN3 DB25 Female Digital I/O Connector
- 7.4 MX800 Specifications
- 7.5 Channel Select DIP Switch Settings
- 7.6 MX800 Model Number Configuration Guide
- 7.7 MX800 System Applications
- 7.7.1 Conventional base station/repeater
- 7.7.2 Link transceiver
- 7.7.3 Data transceiver
- 7.7.4 Paging transmitter
- 7.7.5 Trunking Base Station
- 7.7.6 Systems base
- 7.7.7 Repeater with Morse ID
- 7.7.8 Simplex base station
- 7.7.9 Duplicated base station
- 7.7.10 Power Save base station
- 7.7.11 Tone key base station
- 7.7.12 Voting base station
- 7.7.13 Simulcast base station
- 8. Superseded Technical Information
- 9. Drawings
Technical Manual
6. MX800 Base Station Fault
Finding Procedure
The following test equipment may be required for the following tests:
MXTOOLS (MX800 Base Station Programming Utility)
RF Test Set (e.g. HP 8920 or equivalent)
CRO (Cathode Ray Oscilloscope)
RF Power Meter (capable of measuring to 60 Watts continuously)
Multimeter
+13.8V DC Power Supply (capable of supplying 15Amps)
Network Analyser
MX800 test jig (Optional)
6.1 MX800 Base Station
(The following tests will help diagnose faulty modules)
Check that all of the required connections to the MX800 Radio are made.
Check that all of the interconnecting cables to each of the modules and to the
Motherboard are correctly installed.
Check voltage supply to the MX800 by measuring both sides of Fuse 1
located on the Microcontroller PCB. Replace fuse if necessary.
Check that the power LED is lit. If not then go to section 6.2.
Using MXTOOLS check that the frequency tables and configuration settings
are correct.
6.1.1 Transmitter Section
Connect the output of the Power Amplifier Module to a Comms test set or a
RF power meter.
Using MXTOOLS Diagnostic’s check the TXVCO locking voltage is
between 2 – 18 V and there is no TXVCO ‘Unlock’ alarm displayed.
If the locking voltage is out of spec or an ‘Unlock’ alarm is displayed then go
to section 6.4
Key up the transmitter using the software PTT in MXTOOLS or by shorting
pins 10 (Earth) & 12 (PTT) of CN1 the 15-way connector at the rear of the
radio to ground.
If the output power of the MX800 is LOW then using MXTOOLS check that
the ‘Transmit Power’ control is not on a low setting.
© SPECTRA ENGINEERING 2008 Revision 4.3.1B
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