3.
Locate the Offset field, and enter the desired value.
4.
Click Submit.
Calculating cable delay
The following formula can be used to calculate antenna 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.
When using Spectracom LMR-400 or equivalent coaxial cable, this formula equates to approx-
imately 1.2 nanoseconds of delay per every foot of cable. To calculate the Offset value (cable
delay), multiply the length of the entire cable run by “1.2” and then enter this value into the Off-
set field.
E x a m p l e s o f L M R - 4 0 0 ( o r e q u i v a l e n t ) c o a x c a b l e
d e l a y s :
100 feet of cable = 120 nanoseconds of cable delay
200 feet of cable = 240 nanoseconds of cable delay
300 feet of cable = 360 nanoseconds of cable delay
3.3.3.7 Resetting the GNSS Receiver
The Reset Receiver command causes the GNSS receiver to execute a cold start: All data will be
erased from the volatile receiver memory. Only non-volatile memory is preserved.
Caution: Resetting the GNSS receiver may become necessary in the rare event of
internal communication issues, and is typically ONLY required if Spectracom Tech-
nical Support advises you to execute this command.
Note that resetting the GNSS receiver is not the same as "Deleting the GNSS Receiver Position"
on the facing page.
To reset the GNSS Receiver:
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CHAPTER 3 • SecureSync User Reference Guide Rev. 26
3.3 Managing References
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