[amsat-bb] High speed Data link

[Bronson <bronson@xxxxxxxxxxxxxx>]

Software options are many.

What about Modulation!

Doesn't NASA use BPSK and QPSK for their high speed links to
spacecraft?  FSK is easy for many (myself included I bought a 9612+ so
that I would have at least something) but I don't see FSK as THE
solution just because of its installed base.

I think there is a S/N and a Bandwith advantage to some form of PSK
modulation over FSK.

The 1200 baud PSK modem by KD2BD uses an EXAR XR2211 PLL which has a max
of 300Khz and that is iff you happen to get a good batch.  I don't see
how that chip could be pushed to 300Kbs.

I'm sure some of you out there have some ideas on this.

I think it was TAPR's website that had a description of a 10Mbs modem
(... mmmmm...Ham)!  A bit more than one would need but surely we can
find something in between.

A good choice for hardware and then, as Laura Halliday suggests, do the
rest in software.  I like this approach.

--
/***************************************
Bronson Crothers
LASST
5764 Saw. Res. Center
University of Maine
Orono  ME  04469-5764

Phone: 207 581 2252
Fax:.....207 581 2255

N1ZAQ

-... ...-

Email: bronson@eece.maine.edu
**************************************/


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