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  #11  
Old 09-08-2021, 11:24 AM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
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The problem is fixed. My friend – 83 YO Navy Crew Chief on A4 Skyhawk’s on two Aircraft Carriers (USN ’58 and ’59) found the problem. He suggested that something external to the radio was the problem so we removed fuses one-by-one until fuse labeled “Audio” proved to be the problem. Outstanding. Thank you, my friend…
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 750

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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  #12  
Old 09-08-2021, 03:50 PM
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FORANE FORANE is offline
 
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Quote:
Originally Posted by Piper J3 View Post
The problem is fixed. My friend – 83 YO Navy Crew Chief on A4 Skyhawk’s on two Aircraft Carriers (USN ’58 and ’59) found the problem. He suggested that something external to the radio was the problem so we removed fuses one-by-one until fuse labeled “Audio” proved to be the problem. Outstanding. Thank you, my friend…
Uh, so no audio means no squeal (in addition to no audio of any sort)?
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  #13  
Old 09-08-2021, 11:46 PM
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Piper J3 Piper J3 is offline
 
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Actual problem was stuck stall switch. Pulling audio fuse isolated the problem...
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 750

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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  #14  
Old 11-22-2021, 01:48 PM
NORDO Industries LLC NORDO Industries LLC is offline
 
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Chiming in here as I had a very similar problem, and wanted to help out anyone else who shows up at this page by punching "RV-12 GTR-200 audio feedback" into a search engine

I would get a squeal when transmitting, especially on lower frequencies, and when transmitting my voice always sounded muffled/tinny (especially so on a Bose A20).

What resolved the issue was simply removing the radio from the panel and reinstalling it. There was some grey dust at the bottom back of the housing which I brushed off with my fingertip before putting it back in, which looked like it was in the same general area as the grounding pads on the cage. All that's needed is a long 3/32 hex key, and following the directions in the installation manual.

Repeatedly fiddling with combinations of ICS/Sidetone/Radio Volume/Headset volume sometimes mitigated it, but there were still many instances where ATC said they couldn't hear me.
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