Help with CCS (chronic comm static)

[RV6-O540]

Thanks for the replies guys. You're right about the nutplate attachments. Pulled out the building instructions and plans and found it. 2 1/2" on center. I'll take care of that today and see how the comm issues go from there.

Frank - Yep, Mike had it pretty close to flying when it was flooded in Bloomfield.
Took me over a year to clean, partially rewire and replace everything. Flown it over 120 hrs. My goal is to have the leg fairings, wheel pants, this comm issue and painting done before Oshkosh this year. Love working on it. (well.. all except comm issues)

[SteinAir]

Quick question...are you using a gasket between the antenna and the airframe? Bob makes some excellent points.

No comment on the nutplates other than it's gonna be a bear to put them in with the wings permanently attached.....did nobody mention this to you before? Just curious.

Cheers,
Stein

[RV6-O540]

Originally Posted by SteinAir

Quick question...are you using a gasket between the antenna and the airframe? Bob makes some excellent points.

No comment on the nutplates other than it's gonna be a bear to put them in with the wings permanently attached.....did nobody mention this to you before? Just curious.

Cheers,
Stein

Yes, the cork gasket that came with both Comant antennas. I made sure the countersunk holes on the base were clean and bare and the inside area around the nut is clean. I do intend to change the standard AN screws for stainless.
Ive read several posts about grounding problems on antenna base mounts. From your experience, any pros or cons on mounting bolt grounding vs bare base mounting?

Im thinking since the plans call for nut plates on 2 1/2" centers CherryMax rivits will do the job. I just know I'm not taking the wings off at this late date!

[SteinAir]

Originally Posted by RV6-O540

Yes, the cork gasket that came with both Comant antennas. I made sure the countersunk holes on the base were clean and bare and the inside area around the nut is clean. I do intend to change the standard AN screws for stainless.
Ive read several posts about grounding problems on antenna base mounts. From your experience, any pros or cons on mounting bolt grounding vs bare base mounting?

Im thinking since the plans call for nut plates on 2 1/2" centers CherryMax rivits will do the job. I just know I'm not taking the wings off at this late date!

I'd try getting rid of the cork gaskets as a first step....as for the nutplates, how do you plan on getting the cherry's pulled underneath the fuse skin?

Cheers,
Stein

[LifeofReiley]

For Sure... get rid of the gasket.

[RV6-O540]

Originally Posted by SteinAir

I'd try getting rid of the cork gaskets as a first step....as for the nutplates, how do you plan on getting the cherry's pulled underneath the fuse skin?

Cheers,
Stein

My only option at this point was to use the cherrys through the fuselage into the inside wing rib instead of the nutplates and screws. Which is what I did today after a good cleaning between the skins. It closed the tiny gap nicely.

It made a huge difference in background noise in the system even inside my all steel shop. I'll take off the gaskets also and hopefully get a test with the engine running outside tomorrow. Dont know if Ive got it solved yet, but I'm closing in on it.