All true, Jim.
I think Ken of JK really knows his stuff re antenna design both RF and
mechanical. I trust his NEC4 patterns and plots. I have confirmed with
NEC4 the design of the JK 80m 2L beam which I own. The 80m 2L is awesome
mechanically. At 157' not much gets missed.
As well, re W6NL's design of the 40m Moxon being discussed. I built/own
two. Also NEC4 verified. K3LR and 8P5A use them. The JK Moxon looks
like a close derivative.
Grant KZ1W
On 2/25/2019 15:37 PM, Jim Brown wrote:
On 2/25/2019 2:02 PM, Tony Brock-Fisher via TowerTalk wrote:
just take a look at the SWR curves of each antenna, and you will see
that the JK402T is much more broadbanded.
CAUTION -- SWR is NOT a measure of antenna performance. GAIN and the
overall pattern ARE. SWR tells us nothing about either. An unterminated
1,000 ft spool of RG58 will read 1.1:1 on 40M. :)
I'm not suggesting that the JK antenna isn't better, but SWR ONLY tells
us about SWR, and whether matching is needed to keep the power amp or
output stage happy enough that it will drive it to full power. That's
certainly a good thing, but it doesn't tell us how well the antenna works.
73, Jim K9YC
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