![]() Further, the Squelch sounds like it is set low on that as well, as mentioned before. It seems to me that the shield is either loose or not even there. Personally, I would look to be certain the Audio lines going to the Audio Panel from the GNC is shielded and the shield is grounded correctly. I will get them to swap it with mine and see what happens. My avionics shop has a GNC 300 on their shelf. So either both units are bad or it is something else. It happens with this unit as well as a second GNC 300 that I have. All lights are off and no USB power jacks except for the one built in to the audio panel. The noise goes away when the unit is off or breaker pulled. Yes, the noise is there with only the audio panel and the unit on. If I understand correctly the noise is there even if the only things that are on are the GNC300 and the audio panel? If so does the noise go away when the GNC300 is turned off or its breaker pulled, but the audio panel left on? That would isolate that the GNC300 is the source and it's not getting picked up in the audio panel or between the GNC300 and the audio panel.Īre there any USB power jacks on anywhere? Nothing else on the airplane is powered, e.g., strobes, etc.? Is that the only thing you ever get out of the unit? i.e., does it generate normal audio (or at least noisy audio) when receiving? Was thinking it was the mags/surefly/alternator/VRr making the noise as it continued with everything except for the audio panel off. I had the same issue Wednesday flying from KUTA to KDWH. My avionics shop is not sure what’s happening but they are looking at possibly putting in an in line noise suppressor or something to that effect. I have tried a different GNC 300 and the noise continues. This is recorded from the over head speaker but the noise can be heard in the headsets as well so it is not the speaker. You can adjust the volume and the noise stays at the same level. ![]() I have removed the comm coax from the back of the GNC 300 and the noise continues. ![]() I have tried pulling all circuit breakers to eliminate any other instruments causing interference. You can hear the noise that is being made. I am posting this video which is really just for the audio. I have a 530W, a GNC 300XL, a GMA 345 audio panel, a G5, JPI, and GTX 345 transponder. So, I have been having great difficulty tracking down an issue with my avionics.
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