In a message dated 7/22/2009 12:02:55 P.M. Pacific Daylight Time,
towertalk-request@contesting.com writes:
> I have an HDX 555 tower with a TH11DX on it. I am thinking about
adding a
40 meter beam and I have two choices as I see it. One is to place it above
the TH 11 on the same tower. The second choice is to add a second tower.
I
would probably use the HDX 555 again. The second tower would have to be
north and east of the first tower. That would be in the direction of about
75% of my contacts at that location. I could move the TH 11 to that
location and put the 40 meter beam behind it if that would help but I am
concerned about interactions of the beams. The most separation I would have
would be about 50 feet tip to tip of the beam. If I put them on the same
tower, what is the amount of separation I would need? If I put them on
different towers, how far apart must they reasonably be. I know the
further
the better but is there some rule of thumb of not closer than ... .
Well, separate towers are always easier and cleaner in several respects.
In lieu of the work and cost to install another tower, putting it on the
existing tower certainly would be easier. It looks like Warren County is a 75
MPH windspeed zone so you might be pushing the capacity of the HDX 555
somewhat. What is the tower rating at 75 MPH? I'd put it on an existing tower
if possible.
> I now use a HY Tower for 40 and it works fine but I am thinking a beam
on 40
would be an improvement. I am thinking I will use the four element M2 or
the two element Hy Gain.
Skip the Hy-Gain. It had problems with some element insulators or
something. It's been awhile since it's been a topic of discussion so I don't
quite remember.
The one shorty forty to own is the Cushcraft. Easy to assemble, adjust
and pretty danged reliable. That's the one I'd buy and use.
I've never been a big fan of any linear loaded design (e.g. F12, M2)
but it might be worth the extra cost. K8IA likes his.
Cheers,
Steve K7LXC
TOWER TECH
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