What is the reason for making the verticals 4% long? I am far from being a
4sq guru however it would seem that you should have a choke, especially with
an elevated feedpoint. It is easy to make one using a short piece of RG-302
and a few ferrites that will leave your phased feedline long enough to still
reach the control box.
John KK9A
To: Bryon Paul Veal NØAH <bryonveal@msn.com>, Towertalk Reflector
<towertalk@contesting.com>
Subject: Re: [TowerTalk] Tuning raised radial verticals
From: Rudy Bakalov via TowerTalk <towertalk@contesting.com>
Reply-to: Rudy Bakalov <r_bakalov@yahoo.com>
Date: Thu, 31 Aug 2017 21:23:25 +0000 (UTC)
List-post: <mailto:towertalk@contesting.com>
I am measuring the impedance at the very base of the vertical with a
calibrated
RigExpert. According to DX Engineering the vertical should be connected
without
any baluns, matching networks...nothing. Furthermore, they are saying that
the
vertical should be resonant 4% of the target array frequency. That is, in my
case, if I want to tune the array for 3.550 each individual vertical should
be
tuned for 3.413.
Rudy N2WQFrom: Bryon Paul Veal NØAH <bryonveal@msn.com>To: Rudy Bakalov
<r_bakalov@yahoo.com>; Towertalk Reflector <towertalk@contesting.com>Sent:
Thursday, August 31, 2017, 4:34:40 PM EDTSubject: Re: [TowerTalk] Tuning
raised
radial verticals
your seeing changes in the FEEDPOINT impedance using a tuned raised radial,
thus your SWR will move if yoy mess with them. Suggest you consider using
UnUns at the feedpoints to match the coax impedence to that of the
verticals. Also, a Comtek hybred coupler.....
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