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Re: [TowerTalk] 40 meter Yagis

To: john@kk9a.com
Subject: Re: [TowerTalk] 40 meter Yagis
From: Michael Murphy <mike@ki8r.com>
Date: Wed, 21 Oct 2020 16:19:58 -0400
List-post: <mailto:towertalk@contesting.com>
Have you considered the JK 40 meter moxon?
https://jkantennas.com/jk402t.html

- Mike - KI8R

On Wed, Oct 21, 2020 at 2:07 PM <john@kk9a.com> wrote:

> I believe Cushcraft coils have 68 turns of 12AWG wire.  It is easy to
> get SWR bandwidth with lossy coils.
>
> The JK 2el Yagi should give you 2:1 SWRon the segment you require,  I
> have a couple of OptiBeam OB2-40 beams and I have no trouble covering
> the lower phone band, RTTY and CW.  Actually my SWR improves when they
> are combined with a StackMatch however your 106ft tower may be too
> short for efficiently stacking 40m beams.
>
> John KK9A
>
>
>
>
>
> cqtestk4xs wrote:
>
> Plans are to stack two 2 2-element Yagis.  I've narrowed it down to
> the Cushcraft XM-240 and the JK mid-tri 40.  Realize they are two
> different approaches  to the issue but I have lots of different ways
> to go.  What I am concerned about ...
> First, I have spoken to Ken  at JK and he assures me we can get less
> than 2:1 SWR from 7.0 to 7.2.   The Cushcraft's info says 250kHz for
> the XM240. Also wondering if anyone has stacked these and what effect
> it had on the SWR curve.
>
> Bill K4XS
>
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>
>
>
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-- 
---------------------------------------------
*Michael Murphy - KI8R*

mike@ki8r.com

www.ki8r.com

*614-371-8265 *

---------------------------------------------
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