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Re: Digital Satelite Details



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

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