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Antenna bracket material

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email(at)jaredyates.com
Guest

Posted: Thu May 30, 2013 8:26 am Post subject: Antenna bracket material

I have made a glide slope antenna by stripping back the shield on a piece of coax and doubling it back, as described by Bob and others. The end result is very clean, but now I'm not sure what to do with it. One good place to mount it is on the top of the wind screen, where there is some steel structure that will run parallel to the antenna. How far should I try to get the antenna from that structure?  I have thought about making a bracket to hold it out there, but I don't have any non-conductive material handy. Would something like a carbon fiber mat have any meaningful RF implications?

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nuckolls.bob(at)aeroelect
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Posted: Thu May 30, 2013 4:08 pm Post subject: Antenna bracket material

At 11:19 AM 5/30/2013, you wrote:

 	  Quote: 	
		  



I have made a glide slope antenna by stripping back the shield on a 

piece of coax and doubling it back, as described by Bob and others. 

The end result is very clean, but now I'm not sure what to do with 

it. One good place to mount it is on the top of the wind screen, 

where there is some steel structure that will run parallel to the 

antenna. How far should I try to get the antenna from that 

structure?  I have thought about making a bracket to hold it out 

there, but I don't have any non-conductive material handy. Would 

something like a carbon fiber mat have any meaningful RF implications?


	


    What kind of airplane are we talking about?

    Cessna single-engine plant used to mount their

    GS antenna about 2" down from the top of the

    windscreen frame on centerline. Obviously,

    WAAYyyyy too close to avoid significant

    de-optimization of pattern and swr performance.



    Signal strength for an ILS system is big.

    I've seen the flags raise on the ILS system

    10-15 miles out. Given that most final approach

    fixes are 5nm out, it seems likely that one can

    suffer severe antenna shortcomings without affecting

    usefulness of the system.



    Have you considered a 9' whisker on the belly?

    Yeah, it's polarized wrong but I think it would

    work fine.



    It's a simple experiment. Install the antenna

    and go do some vmc approaches. See how far out

    that you can raise the GS flag and get a steady

    needle. It's a whole lot easier to install and

    doesn't clutter up the windshield.





   Bob . . .

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chasb(at)satx.rr.com
Guest

Posted: Fri May 31, 2013 10:19 am Post subject: Antenna bracket material

I put a Bob Archer VOR/ILS/GS antenna in my fiberglass wingtip. Completely hidden and works like a charm (other than the ILS lines me up about 10 feet left of centerline.)

Charlie Brame

RV-6A  N11CB

San Antonio

--------------------------------------------------------------

[quote]



Time: 09:26:56 AM PST US

Subject: Antenna bracket material

From: Jared Yates <email(at)jaredyates.com (email(at)jaredyates.com)>

I have made a glide slope antenna by stripping back the shield on a piece of coax

and doubling it back, as described by Bob and others. The end result is very

clean, but now I'm not sure what to do with it. One good place to mount it is

on the top of the wind screen, where there is some steel structure that will

run parallel to the antenna. How far should I try to get the antenna from that

structure?  I have thought about making a bracket to hold it out there, but

I don't have any non-conductive material handy. Would something like a carbon

fiber mat have any meaningful RF implications?

[b]

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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