[Elecraft] More on doublet and feedline issues (dw)

[Steve Ellington]

Make a frame using two 2x4's and two 1/2" wood dowels or pvc between them. 
Wrap 300 ohm ladder line around the frame. Make the sides from the 2x4's and 
the horizontal cross pieces from the dowels/pvc. If it's 2' per side you can 
get plenty of length wrapped around it. Leave a gap between wraps of 
whatever the spacing is between the wires. With 300 ohm ladder line you can 
obviously get more turns. Going from one impedance to another doesn't matter 
since you're using a tuner anyway. Use of wire ties along the way will keep 
things in place. I have done this several times and had no problems with 
unbalanced currents.
You can fasten the frame to your outside wall under the roof overhang using 
L brackets. Keeping it dry helps reduce changes when it rains. 73
Steve
N4LQ
N4LQ at carolina.rr.com
----- Original Message ----- 
From: "Clark Macaulay" <clarkmacaulay at yahoo.com>
To: "ElecraftList" <elecraft at mailman.qth.net>
Sent: Thursday, July 16, 2009 1:49 PM
Subject: Re: [Elecraft] More on doublet and feedline issues (dw)


>
> I noticed the quote by W4RNL "He is the first one to remind me of the (1/8 
> wL @ lowest operating Frq) rule for optimizing ladder-line length" and 
> always wondered what to do if the distance to the shack wall is much less 
> than that (especially if 80m operation is desired)?  Laying on the ground 
> is not an option nor is rolling it up in a neat bundle.
>
> What have others done?
>
> Clark KE4RQ
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