On Thu,11/20/2014 12:38 PM, Kelly Taylor wrote:
f every manufacturer applied the same level of, shall we call it optimism?,
to their claimed gain and F/B figures, it appears the C3 worked better than
fixed-spacing, three-el tribanders.
Be curious to know if that's held up in actual on-air operation.
The first link is to a report by Ward Silver, N0AX, on measurements that
he and K7LXC did almost fifteen years ago on the C3 and several other
tri-banders. Ward is now editor of the ARRL Handbook and ARRL Antenna
Book. Both of N6BT's antennas measured better than the tribanders in
their size and class. That is, the C3 beat the small tribanders, the
larger one beat the large tribanders. In those days, the others all used
traps.
http://www.championradio.com/HF-TRIBANDER-PERFORMANCE-TEST-METHODS-RESULTS.2
The second link is to a collection of applications notes by N6BT on the
topic of antenna design. In it, he went through the math to show that
the gain numbers claimed by manufacturers of tribanders were 3-5 dB
greater than a theoretically ideal antenna. In other words, they were
lying. There's plenty of other stuff, including dimensions for his
designs of monoband and multiband Yagis for the HF and VHF bands.
http://www.championradio.com/ARRAY-OF-LIGHT-Straight-talk-about-antennas-and-related-subjects-Third-Edition.113
My neighbor, W6GJB, owns two C3SS tribanders that we use on Field Day
and California QSO Party county expeditions. They play very well.
73, Jim K9YC
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