[sci.electronics] NOAA Decoders/Satellites

charlie@oakhill.UUCP (Charlie Thompson) (12/30/88)

Satellite Trackers:

I am currently tracking the NOAA satellites and receiving APT data
on an R7000 in wideband FM mode.  What I want to know is how SYNC is
derived from the APT format.  I know what the modulation format is
but what is a GOOD way to extract the SYNC?  or ... Do people ignore
the sync and instead depend upon stable sampling of the video to derive
a picture with little or no horizontal precession of the picture from
'top' to 'bottom'.   I have seen 'asynchronous' systems like this 
described.  Any suggestions?  Is there a good source of old G1 FAX
machines around that could be used for hardcopy?  Any stuff for the
Macintosh?  I'll be happy to share info with anyone receiving NOAA
or the Russian METEOR weather satellites.  Thanks!
 
Charlie Thompson WB4HVD
 Austin, TX

postmaster@mailcom.FIDONET.ORG (Bernard Aboba) (02/02/89)

You may wish to check out the last few issues of Circuit Cellar INK which 
has a had a running series of articles on processing of data from weather 
satellites.  
By the way, I recommend INK highly; as of this month, it's Steve 
Ciarcia's sole publishing vehicle, and the other articles are all very 
well written and of high technical content.
 
The usual disclaimer: I'm not an employee, relative, etc. of INK.