In general, properly built coils aren't nearly as bad as you say they
are. It is possible to build coils with a Q of several hundred, and if
you do the math you'll see that the resulting loss is essentially
trivial. It all depends on the rest of the antenna, and yes, a very
short antenna with a crummy coil in the wrong place is going to suck.
But some of the best antennas on the market right now use coil loading
very effectively.
Dave AB7E
On 7/20/2015 2:46 AM, Rick M0LEP wrote:
So far, I've found nothing that comes close, and there's nothing more
frustrating than getting to the top and then finding the antenna you
have is doing a poor job. I now regard anything which relies on loading
coils with deep suspicion. That coil's usually doing a fine job of
converting RF to heat. One such antenna I tested against an inverted-V
dipole turned out to be over 20dB down on the dipole for 40 metres.
On Sun 19 Jul Wayne Burdick wrote:
But the search for the ideal miniature HF antenna continues: something
both very compact *and* highly efficient. Ideally it would break down
to a length of 8" or less, do an excellent job on 20 meters and up,
and earn a passing grade on 30 and/or 40 meters.
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