MX800 Transceiver Technical Manual
© SPECTRA ENGINEERING 2006 Revision 4.2.3
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4. Install the 3x8mm standoff post into the motherboard-mounting hole. Do
not over-tighten this standoff.
5. Install the DCS daughter board into the socket for IC25 ensuring that the
daughter board has correct orientation with respect to pin numbering.
6. Install the 3x5mm screw (removed from step3) to secure the DCS
daughter board.
MX800 Controller Setup:
1. The DCS option is activated in the MXTOOLS ‘Configuration’ heading,
within the ‘Hardware’ folder with ‘DCS Option Installed’ selected.
2. The RF channels that are required to be DCS controlled should be
programmed with the required DCS code in the TX and/or RX channel
fields.
MX800 Testing:
1. If the MX800 had a CTCSS Option previously fitted, test the radio for
correct operation of the DCS Option in both the Transmit and Receive
modes.
2. If the Option T03 is not replacing a CTCSS Option then a ‘Peak
Deviation and Modulation Balance Alignment’ as per Section 5 of the
Technical manual will be necessary. This alignment is to be performed
without the CTCSS/DCS frequencies programmed into the alignment
channel, as the subtone levels will give a false indication of the peak
deviation levels.
3.4 T04 Balanced and Isolated VF
3.4.1 Description
Standard VF connections to line are 600ohm 4-wire unbalanced. Option T04
may be fitted if transformer balanced and isolated VF inputs and outputs are
required. A transformer PCB is fitted internally at the rear of the MX800.
This PCB has a RJ45 connector (CN9), which protrudes through the rear
panel when this option is fitted, and the balanced VF outputs are made
available via this connector.
Note that theses connections are essentially in parallel with the standard VF
connections on CN1. The VF lines on CN1 are still connected when option
T04 is fitted and care should be taken that the TX VF line is not doubly
terminated or that two VF sources are not presented to the transmitter.
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