On Sun, 22 Apr 2001 23:05:42 -0400 "Guy Olinger, K2AV"
> Get your tribander of choice and prepare to possibly
> them at right angles, where the 402CD has been reported to work
The 40-2CD works well aligned with a nearby tribander. Mine is
only 6 feet above the tribander. The loading coils in the 40-2CD
elements move the third harmonic resonance to about 18 Mhz. In fact,
the 40-2CD makes a very good 17 meter antenna, with a deep null off
the sides, and swr ~ 2.
The only thing you need to worry about on the 40-2CD, and probably
any close-spaced beam, is the random length of feedline dangling
off the driven element of the 40, while the tribander is being used.
This feedline can shift the resonance of the 40 driven element into
the higher ham bands. A good way to test for this effect is to
repeatedly short, then open, the 40 meter feedline, while observing
swr on the tribander to see if it changes. If it does change,
experimentally change the length of the 40 feedline.
Dave Hachadorian, K6LL
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