Brian Kelly wrote:
I've read the whole thread thru Tuesday AM, I get your point and it
should work well on 80. I suspect the real advantage of your scheme is
that it might be possible to cover both 80 and 75 with low overall
losses which is difficult to accomplish with a fullsize dipole. Since
you already have the EZNec model on hand how 'bout running a 3.50-3.85
Mhz. sweep to see if it's possible to cover that range with some
single specific length of ladderline and the two-section BC variable
cap? If yes I think you have a real keeper idea.

Maybe you'll like this one. 110 ft dipole at 40 ft, fed with 110 ft of
450 ohm ladder-line and tuned with a single control dual-gang variable cap,
i.e. no conventional antenna tuner. Such an antenna system covers the entire
75-80m band with a 50 ohm SWR ranging from 1.7 at 3.5 MHz to 1.0 at 4.0 MHz,
according to EZNEC. Full band coverage at the twist of one knob? You likeie?

For a coax fed dipole, EZNEC reports an SWR=2:1 bandwidth of 170 kHz.
--
73, Cecil, W5DXP



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