Today's Message Index:
----------------------
1. 05:59 PM - Antenna doubler plate - prime or not (Ralph E. Capen)
2. 07:43 PM - Re: [ExperimentalAvionics] Antenna doubler plate - prime or not (Wayne Sweet)
3. 08:19 PM - Re: Antenna doubler plate - prime or not (Doug McNutt)
4. 08:32 PM - Re: Antenna doubler plate - prime or not (Ralph E. Capen)
Message 1
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| Subject: | Antenna doubler plate - prime or not |
Fellow tron chasers,
I'm putting a comant bent whip on the underside of my RV6A. I have a good
doubler plate (derived from the AC43.13) - pictures if anyone wants to see.
My question is should I prime it?
My initial thoughts are that the existence of the metal structure will
provide the ground plane even if it is not bonded electrically to the
structure - meaning prime on......
Otherwise, how is bonding effected as there is a cork gasket that is to be
installed? Do the four antenna mounting screws provide sufficient bonding?
Thanks,
Ralph
Message 2
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| Subject: | Re: [ExperimentalAvionics] Antenna doubler plate - prime |
or not
Do not use the cork gasket. Use RTV around the antenna base AFTER
installation. Also, the doubler will need to be riveted, and if solid rivets
(not blind rivets) are used, the doulber will be have a solid connection to
the aircraft skin.
Wayne
----- Original Message -----
From: "Ralph E. Capen" <recapen@earthlink.net>
<ExperimentalAvionics@yahoogroups.com>
Sent: Sunday, June 17, 2007 5:55 PM
Subject: [ExperimentalAvionics] Antenna doubler plate - prime or not
> Fellow tron chasers,
>
> I'm putting a comant bent whip on the underside of my RV6A. I have a good
> doubler plate (derived from the AC43.13) - pictures if anyone wants to
> see.
> My question is should I prime it?
>
> My initial thoughts are that the existence of the metal structure will
> provide the ground plane even if it is not bonded electrically to the
> structure - meaning prime on......
> Otherwise, how is bonding effected as there is a cork gasket that is to be
> installed? Do the four antenna mounting screws provide sufficient
> bonding?
>
> Thanks,
> Ralph
>
>
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Message 3
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| Subject: | Re: Antenna doubler plate - prime or not |
At 20:55 -0400 6/17/07, Ralph E. Capen wrote:
>I'm putting a comant bent whip on the underside of my RV6A. I have a good doubler
plate (derived from the AC43.13) - pictures if anyone wants to see.
>My question is should I prime it?
>
>My initial thoughts are that the existence of the metal structure will provide
the ground plane even if it is not bonded electrically to the structure - meaning
prime on......
>Otherwise, how is bonding effected as there is a cork gasket that is to be installed?
Do the four antenna mounting screws provide sufficient bonding?
Back in ancient history - about 1980 - Narco put out an installation note that
said not to use those cork gaskets but rather to assure conductive contact of
the metal of the antenna base with the skin of the aircraft. They said to seal,
after torquing the screws, with silicone rubber from a tube - bathtub caulk.
As for the doubler, I doubt if it makes any electrical difference and priming would
be good if corrosion is a consideration. You do want the BNC connector to
be well grounded to the aircraft skin at the antenna site.
Oh oh. . . RV6A? Is that fiberglass? If so I may be all wet.
--
--> From the U S of A, the only socialist country that refuses to admit it. <--
Message 4
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| Subject: | Re: Antenna doubler plate - prime or not |
The 6A is aluminum....thanks...
----- Original Message -----
From: "Doug McNutt" <douglist@macnauchtan.com>
Sent: Sunday, June 17, 2007 11:16 PM
Subject: Re: Avionics-List: Antenna doubler plate - prime or not
> <douglist@macnauchtan.com>
>
> At 20:55 -0400 6/17/07, Ralph E. Capen wrote:
>>I'm putting a comant bent whip on the underside of my RV6A. I have a good
>>doubler plate (derived from the AC43.13) - pictures if anyone wants to
>>see.
>>My question is should I prime it?
>>
>>My initial thoughts are that the existence of the metal structure will
>>provide the ground plane even if it is not bonded electrically to the
>>structure - meaning prime on......
>>Otherwise, how is bonding effected as there is a cork gasket that is to be
>>installed? Do the four antenna mounting screws provide sufficient
>>bonding?
>
> Back in ancient history - about 1980 - Narco put out an installation note
> that said not to use those cork gaskets but rather to assure conductive
> contact of the metal of the antenna base with the skin of the aircraft.
> They said to seal, after torquing the screws, with silicone rubber from a
> tube - bathtub caulk.
>
> As for the doubler, I doubt if it makes any electrical difference and
> priming would be good if corrosion is a consideration. You do want the BNC
> connector to be well grounded to the aircraft skin at the antenna site.
>
> Oh oh. . . RV6A? Is that fiberglass? If so I may be all wet.
> --
>
> --> From the U S of A, the only socialist country that refuses to admit
> it. <--
>
>
>
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