Joe:
I was wondering if you or anyone else on this thread have considered
a single antenna (like a SteppIR) on a motorized tower where you could raise
and lower the tower to optimize to the angle of arrival. I haven't seen any
comments on this subject and I don't know if there are any computer programs
that take propagation data, etc. and calculate the optimum height. I know
that many "big guns" spend $1000s for that extra dB or two, but many of us
don't have the real-estate for multiple towers and/ or antenna stacks.
Comments, anyone?
73
Bernard, WA4OEJ
----- Original Message -----
From: "Joe Subich, K4IK" <k4ik@subich.com>
To: "'G.E. Tucker'" <gtucker@bostoneng.com>; "'Dan Levin'" <djl@andlev.com>;
<towertalk@contesting.com>
Sent: Tuesday, April 13, 2004 6:39 PM
Subject: RE: [TowerTalk] SteppIR 4 Element Yagi - Analysis and Thoughts
> Has any one tried modelling this product or know of any addtional
> information/discussion about it? I don't see any mention of it at
> http://www.steppir.com but the ad appears only to be the first product
> announcement.
The MonstIR is an amateur version of a receive only antenna that
is sold to agency buyers (the commercial version includes coverage
to 3 MHz with switched coils). Based on the specs and pictures,
the elements are in the same position as the current 4 element 20-6
meter antenna.
Doing some quick modeling with YO, the MonstIR will be capable
of about 7.0 dBi free space gain/20 dB F/R on 40 meters and
about 7.3 dBi gain/18b dB F/R on 30 meters. The gains and F/R
are better than any of the short/loaded 40 meter antennas but
are not quite as good as a "full size" (ca. 46-48' boom) three
element 40 or 30 meter yagi.
Still, for a single antenna with coverage from 7 to 30 and 50-54
MHz, it merits serious consideration.
73,
... Joe, K4IK
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
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_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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