Motorola M12 Oncore User Manual page 30

Motorola GPS Products
M12 Oncore User' s Guide Supplement
Revision 1.0 01/25/00
1PPS CABLE DELAY
The GPS receiver outputs a 1PPS signal, the rising edge of which is placed at the top
of the GPS or UTC one second time mark epoch as specified by the Time Mode. The
1PPS Cable Delay command allows the user to offset the 1PPS time mark in one
nanosecond increments relative to the measurement epoch.
This parameter instructs the GPS receiver to output the 1PPS output pulse earlier in
time to compensate for antenna cable delay. Up to one millisecond of equivalent
cable delay can be removed. Zero cable delay is set for a zero-length antenna cable.
The user should consult a cable data book for the delay per foot for the particular
antenna cable used in order to compute the total cable delay needed for a particular
installation.
This parameter also allows the user to adjust the position of the 1PPS to compensate
for other system delays.
Range: 0.000 to 0.000999999 s
Default value: 0.000 s
Resolution: 1 ns
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