----------
> From: Bill Fisher KM9P <km9p@contesting.com>
> To: C. Logan Dietz (KE5FI) <ke5fi@wt.net>
> Cc: Melvin G. Brafford <brad4@roanoke.infi.net>; towertalk@contesting.com
> Subject: Re: Hy gain antenna query.
To: <towertalk@contesting.com>
> Date: Friday, December 13, 1996 7:58 PM
>
> On Fri, 13 Dec 1996, C. Logan Dietz (KE5FI) wrote:
>
> > Melvin G. Brafford wrote:
> > >
> > > Next week I hope to get my first 105BA 5 element 10 meter beam up to
92' on
> > > my WELL GUYED rohn 25G. My plan is to put another 105BA at the 62'
level
> > > and a third one at 32'. The one on top will be rotatible , but the
other
> > > two will have to be fixed for now. I plan to use a Dunestar stacking
box to
> > > feed the three ants, and run various combinations of stacking. The
land
> > > where this tower is sitting slopes steeply down to the NE and E,
Making the
> > > top ant seem about 150', so with this in mind I had planned to fix
ant
> > > 2..the one at 62' at 90
>
>
> 1. Why monkey with a Dunestar box? Coax is cheap man. And a whole lot
> more reliable.
>
This is true.
> 2. You don't need 3 different stacking positions. You need all or top
> only. Easily done with coax.
>
This is NOT true. There are many times you will want the bottom 2
only...at least that's the way it works up here...maybe even just the
bottom on 10. However
as stated in 1., you can certainly work these problems out using
transmission line
transformers and relays instead of a broadband transformer like the
Stackmatch...
but I'm not sure what the overall performance difference would be...might
be worse
with the transmission line if you arent using good hardline on 10 meters.
> 3. You might want to model your situation with TA. On my hilltop the
> program says as low as 22' is pretty darn good on 10M. Don't be
surprised
> if at the top of the cycle every Wooly Buger Five is beating you with
> their C3's at 30'.
>
Depends a bit on boom length and a lot on terrain, but ...yeah!
> 73
>
> Bill
>
>
73, Tyler K3MM
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: K7LXC@contesting.com
Sponsored by Akorn Access, Inc & KM9P
|