[TowerTalk] W6NL 40-2CD => Moxon Conversion

[WA3GIN]

Interesting stuff...

I wonder how different the beam performance results would be for a similar 
configuration where the "Moxon" elements are replaced with a simple droppy 
wire.

At the club station we have a 40m dipole made from 2" aluminum tubing. The 
horizonal element is 40ft, split in the center and fed directly with 52 ohm 
coax. At the ends of each of the 20ft pieces of  tubing is #10 wire about 
16ft long, but trimmed  to resonance.  Except for guy wire clearance or 
ethetics wouldn' t this configuration yield similar results as the "MOXON"?

73,
dave
wa3gin
----- Original Message ----- 
From: "Samir Popaja, 7S7V (SM7VZX)" <7s7v at adamomail.se>
To: <towertalk at contesting.com>
Sent: Saturday, December 08, 2007 3:17 AM
Subject: Re: [TowerTalk] W6NL 40-2CD => Moxon Conversion


> This antenna appears to have been "built from the ground up" (2004 
> variant).
>
> http://www.kkn.net/dayton2004/W6NL_40.gif
>
> and
>
> http://www.kkn.net/dayton2004/W6NL_40M_MOXON_YAGI.pdf
> ----------------------------------------------------------------------------
> ----------
>
> This antenna appears to have been built (2007 variant) from a modified
> Cushcraft XM-240.
>
> http://www.kkn.net/dayton2007/w6nl_ant.pdf
>
> Will be nice if someone can put list of hardware (without tubes) used on
> variant 2004. Maybe DX Enginnering can make some kit of hardware for W6NL
> Moxon?
>
> 73' Samir
> http://www.qsl.net/7s7v/
>
>
>
>
> __________________________________________________________
> Message: 2
> Date: Fri, 07 Dec 2007 17:53:31 -0800
> From: "Bob Selbrede, K6ZZ" <k6zz at ccis.com>
> Subject: Re: [TowerTalk] W6NL 40-2CD =>  Moxon Conversion
> To: "Tony Brock-Fisher"
> <barockteer at aol.com>,<towertalk at contesting.com>
> Message-ID: <4759f91b.143.2aa5.1074898519 at mail.ccis.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> I concur.  However, that wouldn't be as simple as it may appear.  The are
> three ways to approach the project from what I can tell.  The first is to
> biuld it from scratch without benefit of having a 402-CD or XM-240 around 
> as
> the base antenna to start with.  Then, depending on which CC antenna you
> have on hand, the parts list will be different primarily because the older
> 402-CD requires additional beefing up already taken care of in the XM-240.
>
> A little poking around on the Internet reveals that W6NL initially 
> published
> a design for a 2 element 40M Moxon at Dayton in 2004.  You can find this
> presentation and other FB info on K3LR's web site (www.k3lr.com) as well 
> as
> other locations on the web.  That antenna appears to have been "built from
> the ground up" and has a slightly longer boom than the 402-CD/XM-240.  The
> 2007 variant is based on a modified Cushcraft.
>
> This antenna appears to have been "built from the ground up"..  I didn't
> realize how long the Cross-Tee pieces were until I put the tubing list
> together.  Those buggers are about 21' long and there's one on each 
> element
> half!  As a result it's very important to truss and reinforce the elements
> as shown in the design.  I priced the tubing at one source and it will run
> about $150 for the sizes and lengths required.  The balance of the parts
> consist of stainless steel hardware, small aluminum plates, and the 
> element
> truss materials.  I would estimate the entire cost to be around $250 if
> purchased new.  Not too bad for a shorty-forty which rivals a full size
> three element mounted at the same height!
>
> 73, Bob K6ZZ
>
> No virus found in this outgoing message.
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> 2007-12-07
> 13:11
>
>
>


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