[amsat-bb] Re: Need help with sat tracking software
aa2tx at comcast.net
Sun Sep 30 13:07:46 PDT 2007
At 02:50 PM 9/30/2007, Alan P. Biddle wrote:
>... My own solution is to spend a
>few bucks and get a copy of Instantrack from AMSAT. It is a bulletproof
>program, easy to configure, and easy to check whether you are using the keps
>you think you are. It doesn't work well in real time mode within Windows
>because of RT clock issues, but it works fine for pass prediction, and
>allows you to break the tie between the other two programs.
Just a note. I am also a big fan of InstantTrack and have tested it under
most versions of Windows including XP but not Vista. It actually does work
well in real-time tracking modes under Windows as long as you run it in
This is due to the way that the MS DOS emulator for Windows was designed.
It does not implement the real-time clock tick interrupt correctly
and loses lots of ticks except when it is in full-screen mode. This has
been true of every version of Windows back to 3.0 probably because the
old cpus couldn't keep up and the guys in Redmond never re-wrote it
for the newer cpus that could easily handle it.
As long as you use full-screen mode, you can also run radio tuning
and rotor tracking in real-time and even quit InstantTrack to
run a DOS program in the foreground with tuning and tracking still
running in the background.
There are other DOS environments for Windows including open-source versions
such as DOSBox so an ambitious programmer could fix this problem...
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