[Elecraft] EFHW

[Charlie T, K3ICH]

Anybody got any idea about using a ¼λ of light weight 300Ω twin lead
feed line to a ½λ vertical wire?

This might alleviate the HI Z feedpoint and effectively make an end fed
(bent) ¾ λ Zepp.

So, for 20 Meters, roughly 16 feet of 300Ω connected through a 4:1 balun
at the radio, and  33½ feet at the other end up in a tree or pole.

The down side is that it would be a single band antenna and maybe a tad
cumbersome for 40 M, requiring about 33 feet of twin-lead strung out but
probably NOT laid on the ground.
There IS such a thing as shielded twin-lead that might be OK on the ground,
but it'd be too much extra weight for a portable set-up.

73, Charlie k3ICH



-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
Morgan Bailey, II
Sent: Monday, February 13, 2017 10:32 AM
To: Elecraft Reflector <elecraft at mailman.qth.net>
Subject: [Elecraft] EFHW

I can vouch for the EFHW.  It works great.  I built a parallel tuned
circuit using a roller inductor and a 15-350pf cap.  I have used this
several times on 20 meters feeding a 33.5 foot vertical wire.  I use about
4 10 foot radials, which is probably overkill, and run it through a good
choke and it has been a great performer.  I have also used this box to feed
a 20 and 40 meter halfsquare.  I have ran 500 watts through both the half
square and the 20 meter EFHW with no arcing and an SWR  < 1.5 and a
reactance of 3 or 4.  No problems, works great.

The only issue I have had is that the EFHW tends to be a little bit noisier
than a traditional vertical, but I can put this antenna up and operate in
less than 10 minutes so it's worth the small amount of extra noise.

73, Morgan, NS0R
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