Model 9289
Spectracom Corporation
NetClock/NTP Network Time Provider Instruction Manual
3-42
The following formula is used to calculate the cable delay:
D = (L * C) / V
Where:
D =
Cable delay in nanoseconds
L =
Cable length in feet
C =
Constant derived from velocity of light: 1.016
V =
Nominal velocity of propagation expressed as decimal, i.e. %66 = 0.66 Value is provided by cable
manufacturer.
NOTE:
The antenna cable delay is nominal and beyond the accuracy specifications of the
GPS receiver. It is not normally necessary to set the antenna cable delay.
You can read the current location of the unit calculated by the GPS receiver without logging in.
The GPS receiver will automatically update this field when it has a Position Fix. Check the GPS
Signal Status page (found in the Status and Logs menu). If the status is “Position Fix,” the
location shown is the right location.
The location input by the user may only help to speed up the time to the first fix during the initial
installation. The unit will automatically check the status of the GPS receiver after receiving the
location input from the user. Based on the status of the GPS receiver, the unit will either tell the
user that the GPS receiver already has finished the first fix and the input was abandoned, or
send the location to the GPS receiver.
Summary of Contents for 9289
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