System information

Check the audio output control and MUTE settings
Examine the audio output and MUTE settings on the LCD display receiver home screen. If the audio output indicates
‘MUTE’, you can unmute it from the ‘Audio->Output’ menu.
Use the receiver headphone monitor to check the audio signal
You can use the headphone monitor in the receiver to audition the audio signal the receiver. Note, you can select where
the headphone monitor listens to the audio signal as either pre or post tonekey squelch.
Step 13 Receiver Audio Settings
In addition to checking all the other areas outlined in Step 1 of the RF troubleshooting chapter, you should also check the
following audio areas.
Check the MIC/LINE switch setting on the rear panel of the receiver
The MIC/LINE switch changes the audio output level of the XLR output by 30 dB. If you have a low audio signal and the
switch is set to MIC, try switching it to LINE.
Tip: The state of the MIC/LINE switch can be monitored from the front panel LCD display or at the rear panel switch.
At this point in the troubleshooting, if you have not found anything wrong with the setup, it’s possible that either the trans-
mitter or receiver is malfunctioning. You can use the AXT600 Spectrum Manager (or a spectrum analyzer) to help deter-
mine if the problem is with the transmitter or receiver.
With the Spectrum Manager connected to the RF cascade ports on the antenna distribution amplifier, use the LISTEN
function on the Spectrum Manager and tune it to the frequency of the transmitter. You should see a real-time signal
strength indication of the transmitter RF signal. You can also use the headphone monitor to audition the transmitter audio
signal. If both the RF and audio signals are found to be normal, then it’s possible that the receiver is malfunctioning. If you
don’t see any RF signal strength or don’t hear any audio using the LISTEN function, then it’s possible the transmitter is
malfunctioning.
The final step in troubleshooting RF problems, is to use a spare transmitter and receiver and replace them one at a time
until the problem component is identified. You can also do the same with known good RF cables and by connecting the
receiver antenna directly into the receiver to bypass the antenna distribution amplifier.
Further Investigation
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Chapter 18 ‒ RF and Audio Troubleshooting