[amsat-bb] Re: Antenna direction calibration
domenico.i8cvs at tin.it
Thu Jul 18 13:06:24 PDT 2013
Hi Dave, KB5WIA
To align the antennas, I don't look at the shadow of the antennas on
the ground, but I adjust the position of the antenna in Azimuth and
Elevation until the Sun-Noise received in my Signal Streng indicator
is the maximum.
This is very important particularly at very high frequencies using a
dish because the feed can be wrongly mounted sligtly off point from
the center of the dish and the pencil of the radiation pattern of the dish
can be affected by a squint not visible looking at the shadow of the
feed at the center of the dish but still existing from the point of view
of receiving a less strenght of Sun-Noise.
----- Original Message -----
From: "David Palmer KB5WIA" <kb5wia at amsat.org>
To: "Rodney Waln" <kc0zhf at yahoo.com>
Cc: <amsat-bb at amsat.org>
Sent: Thursday, July 18, 2013 7:15 PM
Subject: [amsat-bb] Re: Antenna direction calibration
> I actually use the sun for aligning the antennas. SatPC32 comes with
> a program called SuM, which can point the antennas directly at the sun
> (or moon!). To align the antennas, I look at the shadow of the
> antennas on the ground, and adjust until the shadow is minimum size.
> It's really easy, (and you don't need to look at the sun to do this
> type of alignment).
> Dave KB5WIA
> On Wed, Jul 17, 2013 at 8:29 PM, Rodney Waln <kc0zhf at yahoo.com> wrote:
> > hi, well i will through my $0.2 in, for my home station to get as
accurate as i can,
> > i listen for a satellite beacon on one of the SSB's set the radio to
track and satpc32 to track,
> > have a radio or wireless mic and take an ht to the roof with me,when i
hear the cw tone that sounds
> > ok i am set. then fine tune things from there, mind you i am at a 10*
handicap do to thre hills around me,
> > so it takes a few tries,
> > i also do it almost the same way for or portable, but you get the idea,
the FM sat's are point and shoot,
> > Rodney
> > kc0zhf
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