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doug.holub(at)tx.rr.com
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 Posted: Sat May 19, 2007 4:48 pm Post subject: transponder antenna ground plane |
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Regarding the size of the ground plane for a transponder antenna, Nuckolls says in his book, "5 1/2" in diameter is sufficient." I thought that's what I did, but after I installed it I found that mine was only 5.22" in diameter. I understand that the length of the radius is important for resonance at the transponder frequency. Can someone tell me how much antenna degradation I can expect by being off by .18"? If it's 10%, I'll reinstall the ground plane. If it's only 2 or 3 percent, I'll probably just leave it the way it is.
Doug Holub
building a Velocity
Irving, Texas
[quote][b]
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europa flugzeug fabrik
Joined: 13 Feb 2006
Posts: 65
Location: North Coast, USA
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| Posted: Sun May 20, 2007 4:56 am Post subject: Re: transponder antenna ground plane |
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| doug.holub(at)tx.rr.com wrote: | | Regarding the size of the ground plane for a transponder antenna.... Can someone tell me how much antenna degradation I can expect by being off by .18"? |
I don't think the effect can be computed, as the principal effect will be on radiation pattern, but intuitively a small effect for that error. ATC needs you to put out at least 70W; if your xponder does 250W-plus as many do, no problemo, IMO.
Fred F.
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gmcjetpilot
Joined: 04 Nov 2006
Posts: 170
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| Posted: Mon May 21, 2007 3:23 am Post subject: transponder antenna ground plane |
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You will be fine. Antennas are part physics and part black magic. Really it fine and the plate size is a ball park. Really the ground plane should or could be infinite. George
Don't pick lemons.
See all the new 2007 cars at Yahoo! Autos. [quote][b]
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