Somewhere in the last couple of months, my Comm radios have developed an annoying problem. I cannot pinpoint exactly when this behavior began, but it is on the recent past and I haven't added too much equipment recently.
I am occasionally receiving a very load sound on the comms. It is hard to describe, but like a squealing, but deeper toned. The sound is very stable in nature, with no oscillation or on/off component like static. It sounds like an electronic noise. It comes in quite a bit louder than the voices that the Comm picks up at any given volume setting. It typically lasts for 10 seconds, but can be longer or shorter. Occasionally it will start and stop a few times. I more commonly pick it up on my KY96 radio, but sometimes get it on the 430W.
The interesting part is that it only happens when 1500' AGL or lower and only when near airports with an ILS. It is more common lower and often happens in the flare or short final. It first happened in the flare and scared the **** out of me.
I am a bit stumped. At first I thought it was some electrical interference in the panel, but don't see how that fits with the limited geography of the occurrences. I thought wiring or antenna, but it is happening to both radios (separate wiring runs and antennas).
I would appreciate any help from the RF experts, as well as others that have seen similar issues.
Thanks,
Larry
I am occasionally receiving a very load sound on the comms. It is hard to describe, but like a squealing, but deeper toned. The sound is very stable in nature, with no oscillation or on/off component like static. It sounds like an electronic noise. It comes in quite a bit louder than the voices that the Comm picks up at any given volume setting. It typically lasts for 10 seconds, but can be longer or shorter. Occasionally it will start and stop a few times. I more commonly pick it up on my KY96 radio, but sometimes get it on the 430W.
The interesting part is that it only happens when 1500' AGL or lower and only when near airports with an ILS. It is more common lower and often happens in the flare or short final. It first happened in the flare and scared the **** out of me.
I am a bit stumped. At first I thought it was some electrical interference in the panel, but don't see how that fits with the limited geography of the occurrences. I thought wiring or antenna, but it is happening to both radios (separate wiring runs and antennas).
I would appreciate any help from the RF experts, as well as others that have seen similar issues.
Thanks,
Larry