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  #1  
Old 09-10-2017, 04:46 PM
rgmwa rgmwa is offline
 
Join Date: Feb 2010
Location: Perth, Western Australia
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Default 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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  #2  
Old 09-10-2017, 06:04 PM
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Piper J3 Piper J3 is offline
 
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Location: Hinckley, Ohio
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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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Last edited by Piper J3 : 09-10-2017 at 06:09 PM.
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  #3  
Old 09-10-2017, 07:17 PM
rgmwa rgmwa is offline
 
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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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  #4  
Old 09-10-2017, 08:18 PM
Mich48041 Mich48041 is offline
 
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Location: Riley TWP MI
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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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  #5  
Old 09-10-2017, 08:35 PM
rgmwa rgmwa is offline
 
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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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  #6  
Old 09-11-2017, 04:15 AM
noelf noelf is offline
 
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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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  #7  
Old 09-11-2017, 05:14 AM
rgmwa rgmwa is offline
 
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Quote:
Originally Posted by noelf View Post
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.
That sounds like a good idea. Thanks Noel.
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  #8  
Old 09-11-2017, 08:50 AM
hthaman hthaman is offline
 
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Location: IL
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Dynon radio can be installed on a ELSA ?
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  #9  
Old 09-11-2017, 03:59 PM
rgmwa rgmwa is offline
 
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Quote:
Originally Posted by hthaman View Post
Dynon radio can be installed on a ELSA ?
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.
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  #10  
Old 09-13-2017, 04:42 AM
todehnal todehnal is offline
 
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Hey Robert, did you find the cause of your squeal?

Tom
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