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Re: Turnstile antennas



If anyone out there is handy with antenna modeling software, I would be very 
interested in seeing a comparison between a conventional turnstile antenna 
(crossed dipoles, in the same plane, fed 90 degrees out of phase and mounted 
1/4 or 3/8 wavelength above a reflector) and the QHTenna (crossed dipoles, 
appear to be separated by the length of the phasing line, fed 90 degrees out 
of phase, no reflector.  I assume that the feedpoint is at the lower of the 
2 dipoles...)  Surely the separation of the dipole sets and the lack of a 
reflector change the pattern dramatically.............

As I said before, I have only used a turnstile as the uplink antenna, and 
switched away from it because of size, antenna restrictions in my 
subdivision, and the loss of the RS birds.  If the QHTenna is sufficiently 
better than a conventional turnstile or Eggbeater (original or K5OE's 
Eggbeater II), then it might just do to get me on the birds from home 
without upsetting the neighbors.  I love my Gulf Alpha beams and 
computer-controlled rotors, but if I put those up here, I'll get slapped 
with a lawsuit so fast...  man, I hope all that lobbying in Washington 
finally gets Congress to address covenants, since the FCC won't.

George, KA3HSW

----- Original Message ----- 
From: "Shawn, N3ZWW" <n3zww@amsat.org>
To: "George Henry" <ka3hsw@earthlink.net>
Sent: Friday, February 25, 2005 11:24 PM
Subject: Re: [amsat-bb] Turnstile antennas


>I got an email from another ham saying they are worthless because the
> signal goes straigh up and not on the sides.
>
> I going to try it my self. One on 2m and one on 70cm.
> Good luck. Let me know how you do. and maybe I talk to you on one of
> these FM birds.
>
> 73 Shawn, N3ZWW
> n3zww@amsat.org
>
>
> --- George Henry <ka3hsw@earthlink.net> wrote:
>
>> I was always a little daunted by the construction of the QFH, but a
>> quick
>> look around the 'net shows some much clearer explanations, drawings,
>> photographs, and easier-to-work-with materials than what I saw in the
>>
>> past...  perhaps it's time to give them a try.
>>
>> George, KA3HSW
----
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