[TowerTalk] Does this make any sense?.....

[Pete Smith]

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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