[time-nuts] Z3801A with other GPS receiver
brooke at pacific.net
Fri May 18 17:22:26 EDT 2007
I seem to remember that one or more of the HP boxes that used the 6/8 channel
Motorola GPS receivers used a secret method of making use of the sawtooth error
information. Some trick was needed because there was a bug that caused the
sawtooth to be wrong every now and then and it always was wrong in the same
polarity. Therefore you could not average using the sawtooth. Most
applications just ignored the sawtooth output and averaged.
But if the Z3801 is using the sawtooth, and you replace the receiver with
another model, then there will be a problem. A fix would be if someone would
come clean and tell us how HP got around the sawtooth bug in detail, then you
could take the output from an M12+T and recreate a data stream that would look
just like the 6/8 channel unit including the buggy sawtooth byte.
Didier Juges wrote:
> Here are a few questions about reusing a Z3801A main board.
> Would the Z3801A work with another GPS receiver?
> In other words, does the board talk to the GPS engine via the serial
> port, other than receiving the 1 PPS?
> If it does talk to the GPS receiver, which GPS receiver other than the
> original 6 channel Oncore model would work with it (compatible command
> Thanks in advance
> Didier KO4BB
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> time-nuts at febo.com
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