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  #1  
Old 12-21-2021, 08:51 PM
rkiefer2 rkiefer2 is offline
 
Join Date: May 2015
Location: Waukesha, WI
Posts: 103
Default Static on radio DESPERATE TO SOLVE

Hello,

I’ve got a factory built 2013 RV12 ULS with Dynon classic view, Garmin SL40 radio, Flight com 403 intercom, auto pilot, and ADSB.

PROBLEM: When radio is receiving I it get static with the radio call.

Intercom works great, my transmissions to others are clear. NO STATIC OTHER THEN WHEN I RECEIVE. I’ve spent about 10 hours checking wires, connections, turning off lights, turning off Dynon, off ELT, replaced intercom, had Garmin radio bench tested, reseated/sealed antenna, even took it to an avionics shop and spent $2000 for them to replace the coaxial cables with shielded ones. Also I did find initially a loose ground on the connector behind the tray, tightened, ALL NO HELP.

Everything worked good for about 4 hours and then the static returned with a radio call randomly and looks like it is here to stay.

I’m hitting a wall on this one and desperate for some help with a solution. Any ideas on what else I should do specifically or things to try?
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  #2  
Old 12-21-2021, 09:25 PM
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greghughespdx greghughespdx is offline
 
Join Date: Nov 2011
Location: Aurora, OR
Posts: 1,169
Default

You don't have a third-party/cheap USB power plug installed, do you? Asking just because those can cause a lot of noise sometimes. Is the static also present when the airplane is not running?
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  #3  
Old 12-21-2021, 09:47 PM
rkiefer2 rkiefer2 is offline
 
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Location: Waukesha, WI
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Default

Nothing installed in the USB
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  #4  
Old 12-21-2021, 10:29 PM
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Piper J3 Piper J3 is offline
 
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Location: Hinckley, Ohio
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You might check antenna connection on back of radio tray for SL40. The 90 degree connector is fastened to the tray with two screws that can come loose happened to me. To do thorough inspection, you need to remove instrument bay top sheet metal.
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  #5  
Old 12-21-2021, 11:18 PM
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Mike S Mike S is offline
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Default

Quote:
Originally Posted by rkiefer2 View Post
Nothing installed in the USB
I believe Greg was referring to the outlet itself, not something plugged into an outlet.
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  #6  
Old 12-22-2021, 03:25 AM
Avanza Avanza is offline
 
Join Date: Jul 2020
Location: Vastervik Sweden
Posts: 139
Smile COM antenna distance to GPS antenna.

If distance between COM / GPS-antenna is less than 3 ft, I would unplug
the GPS-antenna from the Dynon Classic just to check.
The GPS-antenna is DC powered.
A notch filter on the SL40 may help.

Good luck
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  #7  
Old 12-22-2021, 03:27 AM
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mike newall mike newall is offline
 
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Location: Yorkshire, England
Posts: 2,314
Default

Also, check the music input jack socket. That was the cause of static on our 12.

Agree with Greg - USB sockets can spew RF out unless you get a specific suppressed one. Don't need to be expensive, plenty of references on the forum.
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  #8  
Old 12-22-2021, 07:21 AM
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GatorsR1 GatorsR1 is offline
 
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Location: Owens Cross Roads, AL
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Default was at wit's end

My radio (GTR200b) noise issue seemed to be only on transmit.
Pulled the Dynon screen to got behind the panel & check connections, took radio out for exam, pulled wings out to install new headset jack isolators.
After days of doing all that, I happened to crawl under the plane to visually checkout the bottom surfaces and noticed the com antenna didn't appear tight to fuselage.
Sure enough, the phillips head screws turned rather freely.
Opened inspection port, so as to hold nuts, and tightened the screws,
Voila ... perfect comm again.
Was focused on the front end had neglected to think about the "whole" system (ground plane interuptus)
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  #9  
Old 12-22-2021, 08:04 AM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
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Try using a handheld radio. If that receives static too, then you will know that
the static is coming through the air and not through wires.
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  #10  
Old 12-22-2021, 08:28 AM
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N804RV N804RV is offline
 
Join Date: May 2013
Location: Mount Vernon, Wa
Posts: 901
Default

Not just cheap USB sockets.

Those USB "power banks" are noisy too. Lots of folks who were running the homemade Stratux ADS-B receivers were powering them with really noisy "power banks". And, having problems with those power banks actually breaking squelch on their com radios.

If you have to have one in your airplane, buy the ones from Sporty's that are made to be low-noise.
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