[TowerTalk] m2 40M4LLDD + 20m add on

[john at kk9a.com]

I forgot about the Moxon design!

----- Original Message ----- 
From: "Tim Duffy" <k3lr at k3lr.com>
To: <john at kk9a.com>; <towertalk at contesting.com>
Sent: Thursday, July 11, 2013 01:39
Subject: RE: [TowerTalk] m2 40M4LLDD + 20m add on


Hello John

The most efficient shortened two element 40 meter Yagi I am aware of (the
W6NL Moxon) has a VSWR of less than 1.25:1 across all 300 KHz of 40 meters.

http://www.k3lr.com/engineering/moxon/W6NL_Moxon104.pdf

I have had two of them in the air for 5 years - the performance is
outstanding.

73,
Tim K3LR

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
john at kk9a.com
Sent: Wednesday, July 10, 2013 9:31 PM
To: TOWERTALK at contesting.com
Subject: Re: [TowerTalk] m2 40M4LLDD + 20m add on

Any efficient shortened 2el 40m beam will have over 2:1 SWR some place in
the band.  Thankfully there are amplifiers that load fine into higher SWR.

John KK9A


To:Bob Gibson <w5rg at yahoo.com>
Subject:Re: [TowerTalk] m2 40M4LLDD + 20m add on
From:W2RU - Bud Hippisley <W2RU at frontiernet.net>
Date:Wed, 10 Jul 2013 12:37:25 -0400
List-post:<towertalk at contesting.com">mailto:towertalk at contesting.com>

I'm one of those guys up north.  Ice and/or wet snow on the linear loading
is a
disaster; it will move the SWR at the "fair weather" minimum SWR point far
enough in either direction to activate the Alpha 99 high-SWR shutdown
circuit
and generally cause deterioration of various electrical parameters of the
beam.
 That said, I'm very, very pleased with the mechanical aspects of my 40M2LL
(and by extension, the 40M3LL), so I'm hopeful the coils will be offered as
a
retrofit to existing LL owners.

Bud, W2RU

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