Posted by
K9MA on
Jan 09, 2018; 1:39am
URL: http://elecraft.85.s1.nabble.com/PAR-LNR-EFHW-antenna-tp7637237p7637249.html
On 1/8/2018 16:59, Rich Arland wrote:
> Failing that path, has anyone hooked an EFHW to the internal ATU with good results? I would also include a cut to frequency ground radial that I would lay out below the antenna. That would be the easiest thing and simple to employ.
That definitely will not work: The impedance of the EFHW is much to
high for any internal ATU to match. The 64:1 balun may work, though I
haven't tried one. QRPKITS has a QRP tuner, but it works only on a
single band. Most any of the external antenna tuners will work, though
they may be lossy.
The best solution, I think, is to build your own L-network tuner. One
coil, a 3-position switch, and one variable capacitor. You don't have
to get a perfect match, just within the range of the internal ATU, like
3:1. Once you find the right coil tap positions, the internal ATU
should be able to handle the small mismatch with different antenna
installations, etc.
It may seem like a lot of trouble, but if you can match the EFHW, it's
just about the most effective simple wire antenna you can use.
73,
Scott K9MA
--
Scott K9MA
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