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Re: [TowerTalk] XM240 SWR plots

To: <towertalk@contesting.com>
Subject: Re: [TowerTalk] XM240 SWR plots
From: "Ed Sawyer" <sawyered@earthlink.net>
Reply-to: sawyered@earthlink.net
Date: Thu, 29 Mar 2018 13:14:49 -0400
List-post: <mailto:towertalk@contesting.com>
John KK9A stated

    "Excellent point Steve and very well stated.  The Cushcraft is a good
upgrade to an inverted V but it definitely has compromises.  I use OptiBeam
40m beams which have high Q coils and a hairpin coil.  Your relay design is
really the only way to make a shorty 40 efficient and broad banded (I do not
consider the Moxon to be a true shorty 40)."

 

I use the M2  3 el with linear loaded elements.  It has a 200khz bandwidth
of 1.6:1 at the bottom of CW and 2.2:1 at 7200 khz up at 90ft - about 1.2:1
at 7060.  Excellent gain.  Front to back is not great but I listen to EU
usually on a 1000ft pre-amped directional beverage pair phased that has
about 30dB front to back.

 

Ed  N1UR

 

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