Hi:

The original Trimble Trimpack GPS receivers were 1-bit designs, but did=20
not use modern logic chips, just a 68000.  See their key patent:
http://www.prc68.com/I/Trimpack.shtml#Pat

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Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.End2PartyGovernment.com/

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