[Elecraft] K3

[David Cutter]

For a tripod I've used a small, inverted rotary washing line.  These come 
complete with quite a lot of very strong rope and a packing bag.  Remove the 
rope to use as guys for other, larger antenna systems.  3mm poly cord is 
easily strong enough to guy a fishing pole using tent pegs.  You might also 
look at loudspeaker stands.  To stabilise them, I've used a bucket full of 
rocks hung from the centre.

A lighter weight solution I've used is a hinge arrangement with a spike 
pressed into the ground all made from 15mm copper plumbing pipe.  This is 
assembled to a plastic pipe into which the fishing pole is positioned. 
Makes for a tidy all-in-one support.  Photos on request.

David
G3UNA


----- Original Message ----- 
From: "Paul Christensen" <w9ac at arrl.net>
To: "'Elecraft_List'" <elecraft at mailman.qth.net>
Sent: Friday, July 17, 2009 4:57 PM
Subject: Re: [Elecraft] K3


>> Can someone recommend a portable push up pole that I can use for the
>> center
>> insulator and then come down in an inverted V  Thanks Phil
>
> I have an interest in a well-designed telescoping pole as well, preferably
> 20-25 ft on a stable tripod.
>
> In thinking this through for a while, I've also decided on an inverted "V"
> for field use.  The Vee will be fed with 300-ohm ladder line and line 
> length
> will be adjusted pursuant to W5DXP's data to present a near 1:1 VSWR on 
> all
> bands from 40m-10m
>
> http://www.w5dxp.com/notuner.htm
>
> In doing so, I've decided to prepare pre-cut line lengths with banana plug
> connections in lengths of 16', 8', 4', 2', and 1'.   Changing line length
> does not change the 300-ohm VSWR, but it radically affects the end-of-line 
> Z
> and the 50-ohm VSWR.  And so, by manipulating these five plug-in line
> sections, a near 1:1 50-ohm VSWR is possible without a tuner and system
> losses are minimized.  A 1:1 current balun will form the transition 
> between
> the switched ladder line sections and coax.
>
> I thought about using the Budidipole system or one of its variants, and
> finally decided that I could attain better 40m-10m efficiency in the field
> by (1) changing line length; and (2) using a trap-less half-wave antenna
> length on the lowest frequency -- and make simple "plug-in" changes on the
> ground rather than by changing taps up on a telescoping mast.  Moreover,
> since there's a need to tether a 20-25 ft. telescoping mast anyway, it 
> makes
> sense to use the Vee as two of the three guys.
>
> Paul, W9AC
>
>
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