Home > VansAirForceForums

-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

VAF on Twitter:

Go Back   VAF Forums > Model Specific > RV-12/RV-12iS
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Thread Tools Search this Thread Display Modes
Old 12-21-2021, 09:51 PM
rkiefer2 rkiefer2 is offline
Join Date: May 2015
Location: Waukesha, WI
Posts: 110
Default Static on radio DESPERATE TO SOLVE


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?
Roger Kiefer II
RV-12 SLSA - Flying/Instructing
Rv-8 Building
EAA Chapter 18 Member
Waukesha, WI (KUES)
Reply With Quote
Old 12-21-2021, 10:25 PM
greghughespdx's Avatar
greghughespdx greghughespdx is offline
Join Date: Nov 2011
Location: Aurora, OR
Posts: 1,293

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?
Greg Hughes - Van's Aircraft
Van's web site | Instagram | Facebook
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.

Building RV-8A since Sept 2014
Dual AFS 5600, Avidyne IFD 440, Whirlwind 74RV, Superior XP IO-360
VAF build thread - Flickr photo album - Project Facebook page
Aurora, OR (EAA Chapter 105)

Reply With Quote
Old 12-21-2021, 10:47 PM
rkiefer2 rkiefer2 is offline
Join Date: May 2015
Location: Waukesha, WI
Posts: 110

Nothing installed in the USB
Roger Kiefer II
RV-12 SLSA - Flying/Instructing
Rv-8 Building
EAA Chapter 18 Member
Waukesha, WI (KUES)
Reply With Quote
Old 12-21-2021, 11:29 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,855

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.
Attached Thumbnails
Click image for larger version

Name:	Screen Shot 2021-12-22 at 12.28.22 AM.png
Views:	135
Size:	644.1 KB
ID:	19993  
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 830

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
Reply With Quote
Old 12-22-2021, 12:18 AM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 16,611

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.
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Reply With Quote
Old 12-22-2021, 04:25 AM
Avanza Avanza is offline
Join Date: Jul 2020
Location: Vastervik Sweden
Posts: 216
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
Reply With Quote
Old 12-22-2021, 04:27 AM
mike newall's Avatar
mike newall mike newall is offline
Join Date: Jan 2005
Location: Yorkshire, England
Posts: 2,391

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.
"I add a little excitement, a little spice to your lives, and all you do is complain!" - Q

Donated in 2022
Reply With Quote
Old 12-22-2021, 08:21 AM
GatorsR1's Avatar
GatorsR1 GatorsR1 is offline
Join Date: Jul 2018
Location: Owens Cross Roads, AL
Posts: 97
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)
Bob Costello
RV12 dream machine #120764
Support VAF - if you read it, buy it!
Reply With Quote
Old 12-22-2021, 09:04 AM
Mich48041 Mich48041 is offline
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,457

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.
Joe Gores
RV-12 Flying
Reply With Quote
Old 12-22-2021, 09:28 AM
N804RV's Avatar
N804RV N804RV is offline
Join Date: May 2013
Location: Mount Vernon, Wa
Posts: 954

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.
Ken W.
Mount Vernon, WA
2022 VAF Supporter
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 07:45 AM.

The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.