This is a real old chestnut. I have a stack of C-3Es with an EF-240S
(essentially 2 F12 linear-loaded dipoles, tuned as a Yagi) 6 feet above
the tribander. Interaction on 15M was quite noticeable - change in SWR,
decreased F/B ratio - so I turned the 40M antenna 90 degrees, and
everything cleaned up.
YMMV of course, but I think 5-10 feet is a little close. Maybe the F12
Delta elements are different - it would be nice hi
73, Pete N4ZR
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On 7/4/2011 4:16 PM, Charlie Gallo wrote:
>
>> If your C-3 is new you can buy the 40meter Dipole that mounts on your C-3
>> from
>> Force 12. You have to run 2 feed lines and the cost is somewhat more than a
>> D40.
> I started an off list discussion with Peter about this. I did almost exactly
> what he proposed only 6-8 weeks ago, except I used a C3SS and the total stack
> height is lower. In my case, I looked at adding the 40m kit on the c3ss, but
> the increased turning radius would have been an issue (ask W2GD how close I
> am to the property lines)
>
> When it came time to decide parallel to the boom, or parallel to the
> elements, we went with "rule #1" (do what the Mfg says), and we called Force
> 12. They said "5-10 ft between antennas? Put the elements in parallel", so
> we did
>
> System has been working FB, so I can't complain
>
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