Author Topic: comm antenna  (Read 7173 times)

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Offline Reb Wallace

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comm antenna
« on: April 08, 2009, 02:37:17 PM »
I have been having a problem with my comm ant. so just purchased a miracle air whip ant. has anyone out there installed this in a varieze and if so where did you put it, any info would be appriciated  :)

Offline Bruce Hughes

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Re: comm antenna
« Reply #1 on: April 09, 2009, 10:04:40 AM »
Hi Reb

We need a little more information.   Did you get directions with the antenna?  Follow them?
They may assume that it is going on an aluminum airplane; are you using a ground plane;
ship antennas require a fair sized ground plane.   :(

Do you know any ham radio guys; they are gems of information, especially those into UHF?VHF

Bruce Hughes    :)
Yelm, WA
Longeze N199BH
retired
taught at Maui Community College

Offline Bruce Hughes

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Re: comm antenna
« Reply #2 on: April 11, 2009, 10:22:34 AM »
Hi Reb

The manufacturer can tell you if you need a ground plane.  Nothing can be done until
you know the answer to that question.

Do you know any hams in the area?  They can help.

Remember: radio waves pass though most plastics and fiberglass just like visible light
passes through plexiglass.    ;)

Bruce Hughes   :)
Yelm, WA
Longeze N199BH
retired
taught at Maui Community College

Offline Joe Person

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Re: comm antenna
« Reply #3 on: April 11, 2009, 07:37:58 PM »
In 2 minutes of looking over the info on the website, the antenna needs no groundplane, is essentially a durable dipole-type design, and the manufacturer offers a toll-free number.  I'd say give them a call and see if they can offer any hints or advice regarding installation in a composite airframe.  Me?  I'd play around with various locations in the fuselage and see how things work, avoiding metal items as best as possible.
Joe Person
VariEze N79JN
Cozy #879 Under Construction
EAA Tech Counselor 4418
Bothell, WA (KPAE)

Offline dorr

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Re: comm antenna
« Reply #4 on: April 14, 2009, 10:52:44 AM »
Of course it can also be said that a whip antenna on a fast EZ is a drag added device - virtually all our antennas are buried to avoid having whip antennas.

Beagle
David A.C.Orr
"Beagle"
www.canardfinder.com

Offline A. Bruce Hughes

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Re: comm antenna
« Reply #5 on: April 14, 2009, 12:40:27 PM »
As Joe Person knows that the antenna is a dipole, you don't need a ground plane.

How LONG is the antenna?

Do you know about polarization?  Com antennas are vertically polarized, I believe.
(many canard people have put the antenna in one vertical stabilizer so that is
vertically polarized).

Bruce Hughes    :)

Offline A. Bruce Hughes

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Re: comm antenna
« Reply #6 on: April 18, 2009, 02:49:28 PM »
Hi Reb

I think you are trying to find a place for the antenna the hard way.

How long is the antenna?

Most of us have the comm antenna in the winglet.   If you pay VERY CLOSE attention
to the RAF manual, you will be able to put the antenna in the winglet.  Get help from
a canard builder who (1) refers to the manual to see which parts of the wing are
STRUCTURAL and (2) has building experience

That approach will NOT be easy but it avoids the problem of having the wrong
polarization.

Bruce Hughes   :)

Offline ezbill

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Re: comm antenna
« Reply #7 on: April 24, 2009, 04:18:44 PM »
You may want to check out Advanced Aircraft Electronics on the web.
Bill