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09-10-2017, 04:46 PM
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Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
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Radio issues (RV-12)
I'm trying to track down a transmit issue with the SL40 and Flightcom 403 intercom in my RV-12. My radio installation has never worked particularly well, and initially had a loud squeal until I adjusted the SL40 settings as others have previously posted, so I know they are OK. However every time I press the PTT button, I get a loud steady tone in the headset (sidetone?). It is possible to hear voice over the tone on a nearby handheld radio, but the reception is pretty bad, and in the air is reported as unreadable. This happens even with just the master and radio on and everything else off. My mic jack has isolation washers on it as per the plans, and both pilot and co-pilot sides have the same problem. Swapping headsets makes no difference. It was suggested the problem may be in the 403 rather than the SL40. Pilot/passenger conversation works OK. The problem only occurs when the PTT button is pressed. Any ideas?
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rgmwa
RV-12LR 912ULS
120346
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09-10-2017, 06:04 PM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,065
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Most likely not your problem but might want to look here... http://www.vansairforce.com/communit...&highlight=403
Also, check radio problems on page 10 here... http://vansaircraft.com/public/RVato...009-RVator.pdf
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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 622 
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
Last edited by Piper J3 : 09-10-2017 at 06:09 PM.
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09-10-2017, 07:17 PM
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Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
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Thanks Jim. In my case I can receive transmissions OK and voice gets out when I transmit, but the steady loud tone that I hear when I press the PTT button also seems to get transmitted and pretty much masks the voice. My jacks are as per the plans, so they should be OK.
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rgmwa
RV-12LR 912ULS
120346
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09-10-2017, 08:18 PM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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Try removing the radio antenna, cleaning the both the antenna base and the fuselage skin to make sure there is good metal to metal contact when it is reinstalled. Also check the coax cable at each end.
Make sure the radio is FULLY seated in its rack.
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Joe Gores
RV-12 Flying
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09-10-2017, 08:35 PM
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Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
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Thanks Joe. I'll try that. The plane is due for its annual (again!) in a week or two, so it will be a good time to take things apart.
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rgmwa
RV-12LR 912ULS
120346
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09-11-2017, 04:15 AM
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Join Date: Nov 2007
Location: Cary, N.C.
Posts: 1,216
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You could try removing the power wire that powers the 403 intercom. This will "activate" the failsafe feature of the intercom and connect the pilots headset directly to the radio. This should completely bypass the intercom unit.
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Noel
RV-6A N6NF
tip-up
flying
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09-11-2017, 05:14 AM
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Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
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Quote:
Originally Posted by noelf
You could try removing the power wire that powers the 403 intercom. This will "activate" the failsafe feature of the intercom and connect the pilots headset directly to the radio. This should completely bypass the intercom unit.
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That sounds like a good idea. Thanks Noel.
__________________
rgmwa
RV-12LR 912ULS
120346
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09-11-2017, 08:50 AM
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Join Date: Jan 2014
Location: IA
Posts: 56
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Dynon radio can be installed on a ELSA ?
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09-11-2017, 03:59 PM
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Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
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Quote:
Originally Posted by hthaman
Dynon radio can be installed on a ELSA ?
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Yes, but only after certification in the US (or with Van's approval). My 12 is EAB anyway (or AB(E) as it's known here), so no problem.
__________________
rgmwa
RV-12LR 912ULS
120346
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09-13-2017, 04:42 AM
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Join Date: Jan 2005
Location: Kentucky Lakes area in KY
Posts: 947
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Hey Robert, did you find the cause of your squeal?
Tom
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2013- RV12, Kit #119. N123M First flight Nov21. It's a keeper!
1998- RV-9 tail kit, built and sold
1989- RV-6 tail kit, built and sold
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