I am running some trial radio test on PAE VHF main radio and during TX from ATC there is harsh noise at the background even though TX is 5/5. Likewise for the incoming RX from aircrafts. So I swapped the main radio with the standby radio but is giving me same results. I want to know what is causing this noise and how to eliminate it.
If the transmit signal is strong the Signal-to-Noise Ratio is high, which would mean that the noise that you hear is not background white noise filtered through the VHF frequency band. First thing I would look for is an active noise transmitter on the band, which would only be present in a limited set of frequencies.
Hard to say from behind the keyboard what causes the noise that you hear, suggestions for troubleshooting:
- Is the noise present at all Xmit frequencies?
- Does it diminish if you move away from your present position?
- Does your squelch setting help at all?