Have a TH6 at 62 ft with a 40-2CD ten feet above.
Only interaction I noticed was a slight shift in the
SWR curve of the TH6 on 15M. Performance on 15 seems
to be unchanged. Even stacked monobanders can have
sever interaction problems (read about W6QL's (W6QHS)
stacking adventures in his book). Today, if starting
from scratch, one would probably be better off going
with one of the newer, computer designed antennas.
For example, the F12 C36XR has 10/15/20/40 all on one
boom. I would be a lot easier to install, turn,
maintain, etc. than a "christmas tree" stack or two
duobanders. Probably performance would be superior
also. Just my 2 cents...
73, Stew K3ND
--- Bob Thacker <k3gt@pgh.net> wrote:
>
> I agree Phil. My TH11 interacts with a Hy-Gain 402BA
> that is 10' above it.
> Had an old Wilson System One that did not interact
> at all, so FWIW, take
> down the 40ty or live with it!
>
> 73,
>
> Bob, K3GT
>
>
>
> >
> >I have had a TH-11 for many years.
> >I agree with Steve. I have tried several 40m
> >dipoles and yagis 10' above it, at different boom
> >angles, and there was interaction on one antenna or
> >another every time. I just will not take a chance
> anymore
> >that the pattern(s) will be distorted.
> >I think the reason some folks think they have no
> problems
> >with interaction is that they are going by VSWR
> alone.
> >Lord only knows what their patterns look like.
> >
> >(((73)))
> >Phil, K5PC
> >
> >----- Original Message -----
> >From: <K7LXC@aol.com>
> >To: <KI7WX@aol.com>; <towertalk@contesting.com>
> >Sent: Monday, October 18, 1999 10:02 PM
> >Subject: Re: [TowerTalk] 402CD + Skyhawk
> >
> >
> >>
> >> In a message dated 99-10-18 22:48:21 EDT,
> KI7WX@aol.com writes:
> >>
> >> > Has anyone had opportunity to try the Bencher
> Skyhawk + 402CD (or
> XM240)
> >> > combination on the same mast yet? Curious if
> there are any large
> >> > interaction issues with this pairing.
> >>
> >> The 402CD seems relatively impervious to
> relatively close spacing
> (6-7
> >> feet) whereas the XM240 seems to cause problems
> even 10 feet away. I've
> >> experienced this with a TH11 and other
> TowerTalkians have made similar
> >> comments. OTOH a couple of guys said that they
> didn't have much in the
> way of
> >> problems but I don't remember what other antennas
> they were running.
> >>
> >> Cheers, Steve K7LXC
> >> Tower Tech
> >>
> >> --
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> >>
> >>
> >
> >
> >
> >--
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> >
> >
>
>
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>
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