Skipp,
Once I get the pattern I can use RM to calculate all the other "stuff" I need
to know so the height, terain and other info you request is irrelevant to my
current task: plot the antenna pattern as installed on the tower.
Last time I looked in the catalog Stationmaster type antennas are omni when
mounted in "free space". However when mounted offset on the side of a tower
taint necessarily so. Hence my querry.
So far Adam responded with a program that might help. I need to determine if
it (the program) can take the tower surface area into account to let me factor
in the rather oddball tower we're on.
Then, having the apparent patterns, I can use RM to do LR plots and perhaps see
why we're having unexpected dead spots and play cut and try on alternative
tower locations. Unfortunately we can't "top" this tower as the tower owner is
already using that spot.
Bill - WB1GOT
-------------- Original message ----------------------
Message 1
From: "skipp025" [EMAIL PROTECTED]
Date: Sun May 14, 2006 0:03pm(PDT)
Subject: Re: Antenna Pattern Calculator?
Bill,
How high is the tower above the area (on a mountain or valley
floor)? HAAT (height above average terain)? Where is the tower
in relation to the metro areas you want to cover? Is portable
coverage a big deal? What big objects (mountains and conservative
republicans :-) block the coverage?
Type of antenna? Band of operation? Single Antenna?
cheers,
skipp
> "Bill Powell" <[EMAIL PROTECTED]> wrote:
>
> I'm trying to build a case for moving out club's repeater system
> transmit antenna up the tower a bit. Right now the antenna is a
> stationmaster side mounted about 90' up a large tower. It's about 3'
> off the corner of the tower which, at that level is about 4' on each
> side with a section of Rohn 25 up the center as a cable conduit; NO
> cables are permitted to run up the tower legs.
> I want to calculate the apparent pattern and, in turn, load that data
> into RM and see just how bad the nulls are and what the effect would
> be of moving it up another 45', to the opposite side and 6' off that
> corner. Since we must have an insured pro do all climbing the "try it
> and see" approach isn't an option.
> Any suggestions for a calculator that would accept the necessary
> variables (offset, face, position off the corner or face?
> Bill - WB1GOT
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