Odd multiples of a full wave length will exhibit voltage minima and current
maxima at the ends. The means from Ohms law that the ends will exhibit
impedance minima, that is you will need a impedance match to higher
values. A 9:1unun will generally give EFHW antennas a reasonable match to
50 Ohms coax. End feeding a long wire is a tricky business and frought with
many problems.
73, Gary K5AMH
On March 31, 2024 12:26:24 PM John D via BVARC <bvarc@bvarc.org> wrote:
Andre I was having issues with an end fed 73 ft length wire with no unun
and was hoping longer length would decrease SWR. it looks like the exact
opposite happened…
John D
W5RDY
On Mar 30, 2024, at 7:20 PM, Andre Pollard <apollard...@gmail.com> wrote:
Did you tune the length of the wire? I'm running a end fed with 49:1 unun,
and SWR was terrible with 66' of wire. Ended up taking ~4 feet off, and SWR
is under 1.8 on 40, 20, 15, and 10.
On Sat, Mar 30, 2024, 6:54 PM John D via BVARC <bvarc@bvarc.org> wrote:
Does anyone have a recommendation for a good antenna tuner for a 1/2 wave
end fed wire antenna? Have researched Yaesu FC40, LDG Electronics, MFJ, ham
radio website and have not found anything that has attracted my attention.
My SWRs are way off and according to the website "literature" wire
antennas need a tuner...
Any feedback would be greatly appreciated.
John D
W5RDY
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