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 Superseded Technical Information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 Fault Finding
If there were a signal present at this point then it would indicate a fault with
the Mother Board audio or mute operation, go to section 6.2.
6.2 Microcontroller PCB
♦ Check fuse. If blown, replace with a 5x20 mm 3A fast blow fuse.
♦ Check all jumpers and switch settings are in the correct position for your
requirements.
♦ The Microcontroller PCB requires specialised test software to check all
the hardware input and output ports. Please return the Microcontroller
PCB the your nearest Customer Service Centre.
6.3 Receiver Module
6.3.1 VCO Locking.
♦ Check all Hardware settings in MXTOOLS are correct.
Check the value of X3 (13 MHz or 14.4 MHz) is the same as the Rx
Reference Freq. in the ‘Hardware Settings’ in MXTOOLS’ configuration
menu.
Connect a DVM (digital voltmeter) to the RX VCO TP and check the RX
locking voltage is between 2 – 18 V at the RX VCO TP on the
Microcontroller PCB.
Check that +12V (SKD-2) and 28V (SKD-13) supply lines are present.
If the RX locking voltage is out of spec then slowly adjust CT1 on the RX
VCO a full 360°, and check for a change in the locking voltage.
If there is a change in the locking voltage then realign the VCO voltage to 9V
at the centre frequency of the receiver band.
If there is no change in the RX VCO locking voltage, then check that the
VCO supply voltage at SKU-3 is approx. 7V and with a CRO check the
TCXO is oscillating on pin 8 of IC10.
If all the above tests do not pass then the VCO or IC10 may be faulty. Return
the Receiver Module to your Service Centre.
6.3.2 RX Front End
Solder a 2-way Berg header onto a flying coax lead. Remove solder link I
near the mixer (M1) and then fit solder link J. Inject a RF signal into CN5.
Check the sensitivity is better than –110 dBm.
If the sensitivity is OK past this point, then check that the supply voltage to
IC12 is approx. 8V. If the supply is OK, then replace IC12. If this does not
repair the receiver then the alignment may be incorrect or other components
on the front end may be faulty. Go to Section 5.2.2.
© SPECTRA ENGINEERING 2008 Revision 4.3.1B
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