I have two EFHW antennas. One covering 40 and 20; the other 17. They are
mounted at about 40 feet and perform equal to regular dipoles. Feeding
them is therefore much simpler for portable ops since only one side
needs to be elevated. For portable use I feed them with about 20 feet
of RG/58a, although they can be attached directly to the radio. I find,
however, that a bit of coax causes them to be a lot less finicky. They
have been my field day and SOTA portable goto antennas for many years.
Transformers are not difficult to construct and there are some good
quality assembled products that are excellent.
Doug -- K0DXV
On 2/8/2017 3:41 PM, Dan Presley wrote:
Wanted to get some thoughts from folks about pros and cons of an end fed half
wave for portable/SOTA use, as opposed to just using a random length wire with
a counterpoise connected directly to either the KX2 or 3.(I think Eric
recommended somewhere around 28’ depending on the band coverage).Is there any
particular gain advantage? To me the only obvious advantage is not having to
deploy a counterpoise-with the end fed usually the length of coax will act for
this, and of course the need for a suitable Un-Un,usually 9:1. My preferred
antennas these days are lightweight resonant dipoles, which is fine assuming
you have room to erect them, and second is a magnetic loop which I’ve had good
luck with. I use the Alexloop-very light and easy to set up;ground and height
independent generally. But-since you never quite know what will work best I try
to be ready for whatever comes up. I have a variety of lightweight poles to use
with wires. I’ve had pretty good luck with throwing a random length in a tree
or pole with a counterpoise, usually elevated if possible.The auto tuners in
the elecraft rigs are excellent in my book. I think over the years I’ve used a
bunch of portable antennas except the EFHW-just curious what the advantages
might be.
Dan Presley N7CQR
n7...@arrl.net
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