[Towertalk] F12 40M antenna near 10-20M antennas

[Mark Beckwith]

I have installed 2 Force 12 40M antennas in and amongst antennas on other
bands and noticed no reduction in performance of other antennas.  In both
cases the 15M antenna was 15 or 16 feet above the 40.  In both cases the 20M
elements were on the same boom as the 40.

Mark, N5OT

----- Original Message -----
From: "Mel Martin" <ve2dc@rac.ca>
To: <towertalk@contesting.com>
Sent: Friday, April 26, 2002 3:05 PM
Subject: [Towertalk] F12 40M antenna near 10-20M antennas


> Looking for opinions on this setup.
> Force 12 claims that their 2 and 3 el 40M beams (240M 340M) can be
> mounted within 7' of their C31.
>
> I modeled the Cal-Av 40M, and various 2el and 3el 40M beams within 10 ft
> of a C31XR and various other 10-20M beams, (using EZNEC 3.0) and the
> result always seems to be serious loss of gain and destruction of the
> 10-20M pattern. So I'm skeptical about this "within 7 ft" claim. OTOH, I
> had a TH7 10 ft over a 3 el Hy-gain (until the Ice Storm of '98) and it
> seemed to work fine.
>
> Has anyone actually used the 240N or 340N in close proximity to a higher
> frequency antenna, and how were the results?
>
> BTW, I'm looking at the Optibeam Tribander (perhaps over a 240M)...
> anyone have experience with the Optibeam antennas?
>
> Thanks...
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