User`s guide

Chapter 5 - I/O Commands
1PPS CABLE DELAY CORRECTION COMMAND (@@Az)
Applicability: M12+ Timing Receivers
The M12+ timing 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 command. The
1PPS Cable Delay Correction 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 unit length for the particular antenna cable
used in order to compute the total cable delay needed for a particular installation.
This parameter may also be employed by 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
Legacy Code Compatibility: The @@Az command was implemented in an identical fashion on
Motorola UT+ and VP timing receivers.
Motorola GPS Products - M12+ User's Guide Revision 6.X 09FEB05
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