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Re: [TowerTalk] N6BT, Force12inc and JK Antennas

To: towertalk@contesting.com
Subject: Re: [TowerTalk] N6BT, Force12inc and JK Antennas
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Fri, 21 Nov 2014 09:37:31 -0800
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
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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