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Re: Helix antennas



Zachary,

I used a 10 Turn Helix on AO-40 when it was operational on 70 cm Most of the 
time 10 W adverage was all the power I needed to communicate. It had about 3 
times the beamwidth of my 3 Foot dish I used for 2.4 GHz receive, and I 
bungee corded the helix to a 6 Foot step ladder. With some wood blocks I 
could adjust the elevation, and rotating the stepladder for azmuith. I would 
need to make 3 corrections on the dish to one one the Helix it worked fine 
and no rotational fade was observed. I used 1/4 " refrigeration tubeing for 
the helix and tied it to 3 garden 1 " sq stakes for support. The reflector 
was a 2' sq sheet of aluminum.

Art ,
KC6UQH
----- Original Message ----- 
From: "Zachary Schrempp" <ke7eyq@gmail.com>
To: <amsat-bb@amsat.org>
Sent: Wednesday, May 10, 2006 6:04 PM
Subject: [amsat-bb] Helix antennas


> Hello folks,
>
> I am looking for advice on building helix antennas for satellite work.
> Is anybody using helices for both V and U mode to yagi-comparable
> success, and if so, how many turns are you using? I have been over the
> basic overview in the Satellite Handbook and the helix looks like an
> inexpensive, easy-to-build yagi alternative (if not capable of
> switchable polarization). In real practice, has the lack of the
> polarization switch from RHCP to LHCP really caused much difference?
>
> I have been operating FM birds with handhelds for about 6 months and I
> am getting to work on a base station that will be capable of working
> the linear satellites as well. I'm trying to avoid the extra cost and
> complexity of building circularly polarized yagis. Any suggestions
> would be appreciated.
>
> -- 
> Zachary Schrempp, KE7EYQ
> AMSAT #36023
> ----
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----
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