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 [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
