[amsat-bb] Re: a cheap LEO tracker for single op

Rolf Krogstad rolf.krogstad at gmail.com
Tue May 28 13:16:37 PDT 2013


You should find something in the reflector archives from 3 or 4 weeks ago
where there was a discussion of what percentage of passes were overhead.
 It is an extremely low percentage.  If I recall, most are at a an
elevation of 33 degrees or less.

Because of  the wide beam width of my antenna, tilting the antenna at an
angle of 20 to 25 degrees works well for me.  I can copy the satellite
beacons down to the horizon.  And only on the high angle passes do I have a
any drop out

And because of the beam width of the antenna I don't need to keep a hand on
the rotor control all the time.  But it takes some practice to remember to
look at the azimuth reading on the computer and to adjust the rotor
accordingly every couple of minutes.

The problem comes on the more overhead passes.  Because the bird is closest
to my location at that time it seems to accelerate as it gets overhead.  On
those, though, it doesn't seem to be as critical that the rotor be adjusted
anywhere close to the indicated azimuth.  I can hear the signal starting to
fade and it is a reminder to check the azimuth.

I would definitely run a number of passes with the setup before Field Day
to make sure that everything works and that you can remember to do all the
things that your three hands need to do during a pass!

73 from another newbie,

Rolf   NR0T

On Tue, May 28, 2013 at 11:57 AM, Bill (W1PA) <w1pa at hotmail.com> wrote:

> Let me ask this another way...
> Assuming minimal setup prior to each pass, can I track a LEO with a single
> rotor well enough for QSO’s?  (single rotor control in one hand,
> VFO/Doppler on my other)
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

More information about the AMSAT-BB mailing list