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Can anyone point me to information on building or probably purchasing a
QPSK Modulator/Demodulator. I'll be using a 16C874 to collect data and
then dump it to a standard tape recorder. I was considering FSK but QPSK
offers better data density.

Yes, I know, it can all be done with solid state memories, but consider
this , the data interface is RS232C, the proposed data format is TAR
(uncompressed) and the quantity of data is small. Tapes are very cheap
and tape recorders can be purchased for < $50.00 (AUS). The QPSK
interface will hopefully be very cheap to put together. This permits
connection to any PC, Laptop, PDA, UNIX, LINUX, Ultrix, SunOS, IRIX, you
name it work station and OS.

I welcome all pro's and cons.

Nino.
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| Antonio (Nino) L. Benci                            |
| Professional Officer, Electronic Services          |
| School of Physics & Materials Engineering          |
| Monash University                                  |
| email: nino.benci@spme.monash.edu                  |
| T: 61 3 9905 3649. F: 61 3 9905 3637               |
| M: 0414 924 833                                    |
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