[time-nuts] Thunderbolt vs Z3801A
SAIDJACK at aol.com
SAIDJACK at aol.com
Mon Jul 21 14:17:41 EDT 2008
Hi Didier,
the drawback of this approach is that everything is connected together as
one big circuit, and thus processor noise can get into the GPS front end and
reduce the sensitivity and cause other errors..
For RF performance, it's probably better to have the GPS receiver sit all by
itself in a shielded enclosure with it's own TCXO.
Trimble seems to have done a pretty good job at the layout to handle these
types of issues though.
bye,
Said
In a message dated 7/20/2008 18:01:11 Pacific Daylight Time, didier at cox.net
writes:
Because Trimble integrated the GPS receiver and the OCXO, they use the OCXO
as a clock to run the processor, therefore that source of error is not
there.
The ultimate performance is not better than a perfectly optimized
"conventional" GPSDO + OCXO, but excellent performance can be achieved at
lower cost, and without having to deal with certain tradeoffs.
Now, I am sure there are other, more subtle details that explain why the
Z3801A is generally superior to the Thunderbolt, but that I cannot
explain...
Didier
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