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Old 10-11-2019, 02:39 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 1,910
Default SL40 Distortion with Increased Volume?

I have an early RV-12 with SL40 comm and Flightcom 403. I use a LightSpeed Zulu3 headset.

My problem is as follows:

With SL40 volume less than 50% sound on Rx is fine with no distortion or static. If I turn SL40 volume above 50% I get distortion and static. This is easy to test when listening to an AWOS. If I use Pilot ISO on the 403 everything is OK with increased volume.

On the Tx side of things the sidetone for transmit is very clear and reported reception is also clear.

Is my problem with the 403? What about dip switch settings inside the 403?

Any help is greatly appreciated?
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 568

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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Old 10-11-2019, 05:55 PM
BobTurner BobTurner is online now
Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,548

1. Listen to ATIS using pilot headphones jack
2. Turn power to the intercom off
3. Turn up SL40 volume
Is the distortion still there? If yes, the problem is in the SL40. If no, the problem is in the intercom.

Edit: I re-read your post, I see you’ve done the test. There’s a problem in the intercom.

Last edited by BobTurner : 10-11-2019 at 10:15 PM.
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