Technical Manual Technical Description
© SPECTRA ENGINEERING 2006 Revision 4.2.3
37
8. Check that the option board jumpers are in the following positions;
1. JMP1 OUT
2. JMP2 OUT
3. JMP3 OFF (2-3)
4. JMP4 OFF (1-2)
MX800 Controller Setup:
1. The Power Save option is activated in the MXTOOLS ‘Configuration’
heading. Within the ‘Power Save Mode Settings’ folder select ‘Power
Save Option Board Installed’.
2. Setup the power save mode settings as required.
3. Download the Configuration change to the MX800.
MX800 Testing:
1. Connect a Communications Test Set via the RIB to the MX800.
2. Set the switches on the RIB to Line Audio and E&M.
3. Check that all the Transmit parameters (i.e. TX power, modulation, freq.
error) are correct. Correct any anomalies where necessary.
4. Set the test set to measure Rx parameters and ensure that the Receiver is
operating correctly.
5. Replace the MX800 cover.
3.11 T11 Combined Options
This option combines the functions and features of T08, T09 and T10
3.12 T12 External Reference Oscillator Input
3.12.1 Description
The MX800 receiver and transmitter modules have separate reference
oscillators. In normal operation to achieve a low frequency transmitter
modulator frequency response to DC, the MX800 normally uses a two-point
modulation method. For two-point modulation, the TX reference oscillator
and the VCO are both modulated together and in phase. Option T12 provides
for the TX reference frequency to be externally injected. An SMB connector
is fitted to the exciter and an internal cable is provided from there to a chassis
mount N Type connector into which the external reference frequency is
injected. As two-point modulation is not possible with this configuration, the
transmitter frequency response is only specified to 67Hz for this option.
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