The product review is in the August 2004 QST. If you have access to the reviews page you can find it under the "Q" listings by manufacturer. Jim KQ6EA
--- On Sat, 7/4/09, George Henry ka3hsw@att.net wrote:
From: George Henry ka3hsw@att.net Subject: [amsat-bb] Re: Antenna Question To: "amsat bb" amsat-bb@amsat.org Date: Saturday, July 4, 2009, 8:51 AM
Sounds like the "QHTennas", made by N4QH. Reviewed in QST in 2005, then he stopped producing them just a few months later. Near as I could figure out, they are a conventional turnstile design, but with the 2 dipoles separated by the length of the phasing line, and no reflector.
George, KA3HSW
----- Original Message ----- From: "Joel Black" jbblack@charter.net To: amsat-bb@amsat.org Sent: Saturday, July 04, 2009 9:50 AM Subject: [amsat-bb] Antenna Question
Happy Independence Day.
Does anyone recognize the following antennas? I purchased them years ago and they were part of a system I never installed. Over the years, one of the elements has been damaged and, even though I can fix it myself, I'd like to know who made these.
Doggonit, I cannot upload to my webpage (something else yet to figure out). Suffice it to say, my description may not do the antennas justice. There are two of them, a 2m and 70cm made out of sched 40 PVC. They appear to be a "turnstile" type antenna with two aluminum elements at the top and two at the bottom 90° out of phase from each other (top and bottom). In other words, if looking at a compass, the top two elements would be at N and S, the bottom two at E and W. This is the same on both antennas as they are a matching set.
These antennas were in an old QST, but I have since gotten rid of all those magazines and cannot find the article online. Any ideas or suggestions?
Tnx, Joel, W4JBB
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Yeah, I found the review on the ARRL web site by searching for "QHTenna".
Looking at the pictures, it appears that the dipoles are separated by about 1/4 wave in free space, which is physically longer than a 1/4 wave phasing line would be. And I'd think that the phasing line would have to be 1/2 wavelength, after introducing a 1/4 wave offset between the dipoles, correct?
In answer to Joel's original question, there is a link at www.qhtenna.com for questions or support for owners of existing QHTennas.
They should be pretty easy to duplicate, at any rate.
George, KA3HSW
----- Original Message ----- From: "Jim Jerzycke" kq6ea@pacbell.net To: "amsat bb" amsat-bb@amsat.org; "George Henry" ka3hsw@att.net Sent: Saturday, July 04, 2009 1:54 PM Subject: Re: [amsat-bb] Re: Antenna Question
The product review is in the August 2004 QST. If you have access to the reviews page you can find it under the "Q" listings by manufacturer. Jim KQ6EA
--- On Sat, 7/4/09, George Henry ka3hsw@att.net wrote:
From: George Henry ka3hsw@att.net Subject: [amsat-bb] Re: Antenna Question To: "amsat bb" amsat-bb@amsat.org Date: Saturday, July 4, 2009, 8:51 AM
Sounds like the "QHTennas", made by N4QH. Reviewed in QST in 2005, then he stopped producing them just a few months later. Near as I could figure out, they are a conventional turnstile design, but with the 2 dipoles separated by the length of the phasing line, and no reflector.
George, KA3HSW
I would suggest that you don't need a phasing line if the dipoles are spaces a quarter wave and that both are fed by equal length cables.
George Henry wrote:
Looking at the pictures, it appears that the dipoles are separated by about 1/4 wave in free space, which is physically longer than a 1/4 wave phasing line would be. And I'd think that the phasing line would have to be 1/2 wavelength, after introducing a 1/4 wave offset between the dipoles, correct?
participants (3)
-
George Henry -
Jim Jerzycke -
Nigel Gunn G8IFF/W8IFF