Hello All -
The recent discussion on the use / not use of splitters affecting GPS
timing performance may be further informed by this table. It was
extracted from
page 5-8 of the
"Thunderbolt Disciplined Clock User Guide"
Version 5.0
Part Number: 35326-30
November 2003
Table 5-1 GPS Error Sources
Error Source 1 Standard Deviation 5 - 50 ns
Atmospheric Models (Ionosphere) 5 - 50 ns
Receiver noise (Multipath) 1 - 20 ns
Satellite Clock Model 10 ns
Satellite Orbit Model 5 ns
Antenna Survey 1 ns
Paragraph 5.2 on the same page indicates the timing between two
sites to be +/-15 ns 3 sigma for the T-bolt
My take on this as an old microwave guy and non-timing expert is that
there are problems greater than splitter cross-talk and variations in
cable
propagation delay at least for simple systems using only L1.
The more learned in these matters may be able to refine the above.
For those interested in measuring splitter effects,please remember that
no
splitter will perform correctly unless terminated on ALL ports in its
design
impedance. This is especially true for isolation.
- best regards john roos k6iql
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