Tim, Thanks for that information. Do you find that the Moxons are more
sensitive to this interaction?
In my installation on 20M and 15M, I have preforms attached directly to the
tower then Philly down to 12 ft ground extensions with EHS. I don't see any
SWR move with the turning of the beams.
On my other tower, I do see some change with 40M 3 el M2 beam (47 ft linear
loaded elements). However my 80M wire yagi is 18 ft below and I was
assuming that is where some of the interaction was coming from.
Ed N1UR
-----Original Message-----
From: Tim Duffy [mailto:k3lr@k3lr.com]
Sent: Thursday, October 3, 2019 12:47 PM
To: 'Ed Sawyer'; towertalk@contesting.com
Subject: RE: [TowerTalk] EHS leads for Phillystran
Hello Ed:
It is the combination of three preforms at the guy point and the tower face.
The problem is worse as you go higher in frequency (20, 15 and 10 meters).
K3LR uses two Moxon's and three full size four element OWA's for 40 meters.
73
Tim K3LR
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Ed
Sawyer
Sent: Thursday, October 3, 2019 12:42 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] EHS leads for Phillystran
I was not originally realizing this preform discussion was talking about
Phillystran. So are we saying that the 4 ft long preform, attached to the
tower, is actually affecting the 40M yagi as it turns? The dimensions make
that really surprising. How do you know something else isn't affecting the
SWR as you turn it. You would have to have a single 40M yagi on the tower
to know that wouldn't you?
Also, I believe K3LR uses Moxons? And isn't that design more susceptible to
adjacent loading of elements than a yagi element?
Interesting discussion.
Ed N1UR
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