There's an unavoidable tradeoff using an end fed wire with an ATU of
limited range. Since the ATU can't match the high impedance of a half
wave multiple, the lower impedance of the wire will lead to larger
ground/counterpoise currents. Even with a decent ground and/or
counterpoise, some power is lost, and at 100 W or above, you might need
to keep you fingers off the metal stuff. That said, it can be a simple,
effective way to get on the air.
I've long been a fan of the EFHW, but I've always used an external
tuner. The impedance should be somewhere in the 1K-5K range. An
internal ATU might be able to match that with an external transformer,
say with a 3:1 turns ratio, though I'm not sure one could make such a
transformer with low enough stray capacitance to work on the higher
bands. Has anyone tried it?
73,
Scott K9MA
--
Scott K9MA
[email protected]
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