Bob -
Thanks you for your comments below.
"As others have reported, a TBolt in a good environment is closer to a
1 or 2
ns one sigma (over 100+ seconds) than to the numbers in the Trimble
manual.
The satellite data on the NIST site shows much better numbers than they
show
for Satellite Clock and Satellite orbit."
That is encouraging. Trimble probably worst cased it to avoid issues.
Good idea for
a product.
On further thought it occurred to me that that for purposes of
comparison
between receivers use of a single antenna reduces the number of
variables. Thus the issue comes
down to the effect of the presence of the second receiver - assuming
that a passive splitter in a
lab environment stays pretty well put. I think this can be proven by
test easily enough.
One simple experiment for the curious would be to observe the
performance of one receiver (the UUT)
with both connected to the splitter and then evaluate the change in
performance with the second receiver under
the following conditions.
1. disconnected and cable open circuited
2 disconnected and cable terminated - may required a DC block
3. disconnected and cable shorted - may require DC block
Up until yesterday I had a setup for other tests that could do it
easily, but I goofed and cleaned
up the bench.
best regards - john k6iql
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