I have a 204BA at 70 feet and a Cushcraft 40-2CD at 80 feet on the same
mast!
No interaction at all!
73,
Ted K2QMF
On Tue, 12 Aug 2014 21:57:24 -0700 Marko L Myllymaki
<marko.l.myllymaki@gmail.com> writes:
> Hi,
>
> Would anyone have any insight to offer on this or real life
> experience of
> this combination you could share:
>
> I know some of the tribander booms+end elements such as KT36XA
> with
> non-insulated elements can resonate on 40 meters and so messing up
> with 40 m
> yagi if mounted on same mast nearby. There was great article of
> this in NCJ
> while back. KT36XA boom is 32 ft long.
>
> Does anyone have insight if same issue happens with 204BA with its
> non-insulated elements and 26 ft long boom, or does its
> boom+elements
> resonace fall outside of 40 m band ? Is there someone who has
> modeled this
> ?
>
> If tribander boom+end elements resonance actually does fall on 40 m
> band,
> then is this even problem if booms of 40 m and tribander are
> aligned, or
> would it be problem only if antennas are 90 degrees off each others
> ? Have
> heard various opinions on this and I don't have yet my own
> experience on
> some of these things.
>
>
>
> I'm considering what combination I will put on one of the 2 towers.
> Current
> plan is now to have M2 40M3L linear loaded yagi at the bottom of
> mast, then
> maybe around 8 ft above that 204BA and some 15 m yagi another few
> feet above
> 20 m. Booms of 40 and 20 would point same direction and 15 at the
> top would
> be 90 degrees off in order to minimize coupling between 40 and 15 m
> antennas.
>
> I have 40M3L already in my possession, but I'm trying to decide what
> to do
> with 20 and 15 on that tower. There are other possibilities, but
> above is
> what I'm currently considering.
>
>
>
> Need to decide path to proceed fairly soon, and I'm not planning to
> start
> learning modeling SW right now.
>
> I would very much appreciate any insight and experience on this
> combination.
>
> 73 de Marko N5ZO
>
>
>
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