[Elecraft] PAR/LNR EFHW antenna

[K9MA]

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

k9ma at sdellington.us