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antenna ground plane

 
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jgamtmann2(at)gmail.com
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PostPosted: Wed Jul 23, 2008 3:20 pm    Post subject: antenna ground plane Reply with quote
Hello, I can not find an answer to this question in my available
material: how symmetrical does the fround plane have to be to the
antenna, in this case a COM antenna. The ideal place for my COM
antenna in my RV6 is 6" aft of the firewall (plastic cowl) and 6"
inboard from the left edge of the fuselage. This leaves only a 90
degree sector of ground plane around the antenna mounting point. This
spot was picked to keep the antenna out of the exhaust, keep it far
away from the xponder antenna, and keep it fwd of the spar for easier
run of the coax. Is this position OK?

Regards, Jurgen Amtmann jgamtmann2(at)gmail.com

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sportav8r(at)gmail.com
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PostPosted: Wed Jul 23, 2008 3:43 pm    Post subject: antenna ground plane Reply with quote
Jurgen-

I think your antenna will work just fine in that location.

Mine is just fwd of the spar, and to one side of centerline, right in the exhaust stream. This has not been an issue at all. The separation from the transponder antenna is also not an issue. These two radio devices don't really interfere with each other as far as I know - they are on widely different frequencies and each transmits only intermittently. I think you'd be hard pressed to damage the receiver front end of either device by co-locating the antennas too closely.

In other words, most anywhere on the belly of the plane that allows sturdy mounting and easy coax routing should give excellent results.

Bill RV-6A 700 hrs.
On Wed, Jul 23, 2008 at 7:16 PM, Janet Amtmann <jgamtmann2(at)gmail.com (jgamtmann2(at)gmail.com)> wrote:
[quote]--> AeroElectric-List message posted by: "Janet Amtmann" <jgamtmann2(at)gmail.com (jgamtmann2(at)gmail.com)>

Hello, I can not find an answer to this question in my available
material: how symmetrical does the fround plane have to be to the
antenna, in this case a COM antenna. The ideal place for my COM
antenna in my RV6 is 6" aft of the firewall (plastic cowl) and 6"
inboard from the left edge of the fuselage. This leaves only a 90
degree sector of ground plane around the antenna mounting point. This
spot was picked to keep the antenna out of the exhaust, keep it far
away from the xponder antenna, and keep it fwd of the spar for easier
run of the coax. Is this position OK?

Regards, Jurgen Amtmann jgamtmann2(at)gmail.com (jgamtmann2(at)gmail.com)




[b]

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bobf(at)feldtman.com
Guest
PostPosted: Wed Jul 23, 2008 4:42 pm    Post subject: antenna ground plane Reply with quote
it will be fine. All our airplanes have a less than omnidirectional radiating pattern - just make sure the SWR is reasonable (less than about 2:1 is great - 3:1 is acceptable). get a ham to loan you an SWR meter.
bobf

W5RF
Glastar
On Wed, Jul 23, 2008 at 6:16 PM, Janet Amtmann <jgamtmann2(at)gmail.com (jgamtmann2(at)gmail.com)> wrote:
[quote] --> AeroElectric-List message posted by: "Janet Amtmann" <jgamtmann2(at)gmail.com (jgamtmann2(at)gmail.com)>

Hello, I can not find an answer to this question in my available
material: how symmetrical does the fround plane have to be to the
antenna, in this case a COM antenna. The ideal place for my COM
antenna in my RV6 is 6" aft of the firewall (plastic cowl) and 6"
inboard from the left edge of the fuselage. This leaves only a 90
degree sector of ground plane around the antenna mounting point. This
spot was picked to keep the antenna out of the exhaust, keep it far
away from the xponder antenna, and keep it fwd of the spar for easier
run of the coax. Is this position OK?

Regards, Jurgen Amtmann jgamtmann2(at)gmail.com (jgamtmann2(at)gmail.com)




[b]

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