RELM SMX920 Technical Manual page 24

SMX920 Base Station & Repeater
SMX920 Controller Setup:
1. The SMX920 RF channels that are required to be simplex should be programmed
as 'SIMPLEX' within the channel edit screen of the radio configuration menu
system and then downloaded to the SMX920.
2. Software switch 'Simplex mode' in the radio configuration menu system is
switched 'X' as per Section 4.1 of the SMX920 Manual.
SMX920 Testing:
1. Connect a Communications Test Set to the SMX920.
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 SMX920 (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 SMX920 cover.
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Technical Manual
RELM/ BK RADIO