Re: [amsat-bb] Digital Satelite Details

[John Magliacane <magliaco@xxxxxxxxxxxxxx>]

On Mon, 24 Apr 2000, Bronson wrote:

> What I would like to know is:
> 
> Just what is the PACSAT communications protocol?  I am looking for the
> kind of info you can use to write a program to deal with the PACSATs.

	ftp://ftp.amsat.org/amsat/satinfo/pacsat/pacdoc.zip

carries full details of the Pacsat Communications Protocol.

> What are the details of the BPSK and FSK modes?  ie. phase shifts and/or
> frequency shifts where applicable.

	http://www.amsat.org/amsat/articles/kd2bd/Digital/

carries a discussion regarding the various modulation end encoding methods
used by OSCAR satellites.

> What are the protocols and/or decoding procedures used to extract the
> info from the telemetry signal of a given satellite?  I doubt there is
> any standardization here but somewhere someone must know this info for a
> given satellite.

The format used by the Pacsats to transmit telemetry is fairly generic,
but the calibration equations differ between satellites. 

> Just what is "Manchester" encoded?  Again I am looking for the kind of
> info that can be used to program a DSP system.

In addition to the URL listed above,

	http://www.amsat.org/amsat/articles/kd2bd/Pacsat_Modem/

provides additional details on Manchester encoding (including
actual schematics).


73, de John, KD2BD

--
-=-=-=-=-=-=-=-=-=-=-=-=- John A. Magliacane, KD2BD -=-=-=-=-=-=-=-=-=-=-=-=-
Internet  : kd2bd@amsat.org          |  Voice : +1.732.224.2948
Satellite : AO-16, KO-25             |  Morse : -.-  -..  ..---  -...  -..
Packet    : KD2BD @ N2TDU.NJ.USA.NA  |  WWW   : http://www.njin.net/~magliaco/
Video     : 426.250 MHz/439.250 MHz  |  FAX   : +1.732.224.2060
-=-=-=-=-=-=-=-=-=-=-=- Linux Doesn't Cost.  It Pays. -=-=-=-=-=-=-=-=-=-=-=-

----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org