With that stocking distance on 20m you will be lucky to get 3dB gain.
With 21m distance between 20m antennas you might reach 5.6dB
73
Peter
_____
From: jim.thom jim.thom@telus.net [mailto:jim.thom@telus.net]
Sent: Freitag, 3. September 2021 21:10
To: Peter Voelpel
Cc: towertalk@contesting.com
Subject: Re: [TowerTalk] TH-7
4 x yagis stacked is only 4db ? Per the original article, it was a
flame thrower.
Jim VE7RF
On Fri, Sep 3, 2021 at 11:15 AM Peter Voelpel <dj7ww@t-online.de> wrote:
The stacking gain on 20m will be less then 4dB.
73
Peter
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
jim.thom jim.thom@telus.net
Sent: Freitag, 3. September 2021 19:49
To: towertalk@contesting.com
Subject: [TowerTalk] TH-7
Date: Fri, 3 Sep 2021 09:59:46 -0400
From: "Mike Ryan" <mryan001@tampabay.rr.com>
To: <TowerTalk@contesting.com>
Subject: Re: [TowerTalk] TH-7
<There was an op in Texas who mounted 4 of these on a rotating tower. There
<was an article in one of the ham magazines some years ago about it. But it
<was impressive. The TH7 has 5 elements on 10mtrs which soon will be more in
## It was on the front cover of a CQ magazine, back in the 80's. He
stacked em at 35-70-105-140'. With all 4 driven in phase, he was 20 db
louder than another ham, close by, who had just a single TH-7 up 70'.
I find that hard to believe, but that was what was reported.
The article was entitled.... "TH-28".
Jim VE7RF
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