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Technical Manual
2. Software switch 'Simplex mode' in the radio configuration menu system is
switched 'X' as per Section 4.1 of the MX920 Manual.
MX920 Testing:
1. Connect a Communications Test Set to the MX920.
2. Monitor the Low Level muted RX VF Audio (Pin1 of RJ45).
3. Set the test set to measure Rx line level and ensure that the Receiver is operating
correctly.
4. Set the test set to measure TX modulation level and Inject into RJ45 pin 4 with a
audio generator output level of –10dBm.
5. PTT the MX920 (RJ45 Pin 3) and measure the TX Power and modulation depth.
Ensure that the coaxial relay operates correctly and that the full RF power is
measured on the test set.
6. Operate the PTT in quick succession and ensure that the coaxial relay operates in
unison with the PTT switch.
7. Replace the MX920 cover.
© SPECTRA ENGINEERING 2003 Revision 1.1.4
Installation and Operation
15
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