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Re: re 10m antenna for downlink



Jim,
1008 divided by frequency in MHz. answer is in decmal feet, not feet and
inches.

Art KC6UQH
----- Original Message -----
From: "Reicher, James" <JReicher@hrblock.com>
To: <amsat-bb@AMSAT.Org>
Cc: "Glen Gardner" <Glen.Gardner@verizon.net>
Sent: Monday, June 14, 2004 8:03 AM
Subject: RE: [amsat-bb] re 10m antenna for downlink


> Anyone remember the formula for calculating a full wave loop?
>
> 73 de N8AU, Jim in Raymore, MO
>
> -----Original Message-----
> From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org] On
> Behalf Of Glen Gardner
> Sent: Sunday, June 13, 2004 11:19 PM
> To: amsat-bb@AMSAT.Org
> Subject: [amsat-bb] re 10m antenna for downlink
>
> I've had very good luck with a full wave horizontal loop antenna for use
>
> with 10M downlink on LEO satellites in the past.
> Put a 1:1 balun on it and use a Q section of 75 ohm coax (full wave loop
>
> is around 90 ohms impedance) to get a good radiatin pattern and to get
> the impedance down close to 50 ohms and it works well. It will be
> omnidirectional in the horizontal plane and the height above ground can
> be adjusted to give  nice cardioid pattern upward for high eleivation
> passes.  About 8-10 feet off the ground is fine.
>
> I had one in the rafters of my garage in Michigan, and I was quite
> pleased with the performance.
>
>
> At present, I'm using a dipole made from helically wound CB trucker
> antennas (which I bought at radio shack a long time ago) and a home made
>
> balun.
> It works rather well , but does not have the pickup efficiency of a full
>
> wave loop due to the small surface area ofthe dipole.
>
> --
> Glen E. Gardner, Jr.
> AA8C
> AMSAT MEMBER 10593
> Glen.Gardner@verizon.net
>
>
> http://members.bellatlantic.net/~vze24qhw/index.html
>
>
> ----
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>
> ----
> Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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