Technical Manual Technical Description
© SPECTRA ENGINEERING 2006 Revision 4.2.3
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5. PTT the MX800 and measure the TX modulation depth. Adjust RV4 or
RV4A for the modulation depth that is require if necessary.
6. To check the Rx isolated mute output, switch the RF level on the
Comm.’s test set to ON. The Mute LED on the RIB should be ON. The
LED should go OFF when the RF output from the test set is switched
OFF.
7. Replace the MX800 cover.
3.6 T06 Simplex Changeover Relay
3.6.1 Description
For simplex applications an internally mounted coaxial changeover relay can
be provided. This mounts on the rear panel and the common port protrudes
through the chassis providing the simplex antenna connection. The relay
normally closed port is internally connected to the MX800 receiver and the
normally open port is connected to the transmitter via the standard RX
connector hole in the chassis (the RX connector is removed) using a special
cable assembly. The relay also has control connections to the micro controller
PCB.
Once the relay option is fitted the channels are programmed as simplex
channels through the Channels Edit screen of MXTOOLS. Switches SW2/1
& SW2/2 on the micro controller are switched ON to delay the transmitter
PTT (to allow the relay to changeover) and set the simplex operating mode
respectively.
Figure 3-6 T06 Simplex Changeover Relay
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