REFERENCES - Timecode
For example, the standard 50 foot RG-59 antenna cable x 1.24 nS/foot = 62 nS of Antenna
Cable Delay.
Or, using meters, the standard 15.24 meter RG-59 antenna cable x 4.06 nS/meter = 62 nS
of Antenna Cable Delay.
Note: Use the Cable Delay setting on the REFERENCES - Timecode page to compensate for
the length of the Timecode Output cable. Avoid using Antenna Cable Delay for that purpose.
REFERENCES - Timecode
Use this page to configure the timecode input and output on the SyncServer.
Also see IRIG In (Timecode In) (on page 118) and IRIG Out (Timecode Out) (on page
119).
Timecode Configuration
Status: Reports "locked" when the Timecode Input signal and configuration are both valid.
Otherwise it reports "unlocked".
Configure the Timecode Input setting to match the input signal on the IRIG In connector.
n If the Timecode Input is marked "without YR", and there are no other Input References or
synchronizing NTP associations (the default NTP servers on NTP - Assoc page), verify
that the time SyncServer includes the correct year. If needed, manually set the year. See
in Setting the Time Manually (on page 177).
Note: IRIG B 1344 provides a Leap Indicator warning during the minute preceding a leap
second insertion/deletion. If a leap second adjustment occurs while the SyncServer is syn-
chronized to IRIG B 1344 *, NTP clients that don't poll the SyncServer during this one-
minute warning period may be off by approximately one second until they synchronize to the
new time. If the Maximum Poll Interval of the NTP clients is sufficiently shorter than one
minute (e.g., 16 or 32 seconds), this scenario is less likely to occur.
*The "SyncServer is locked to IRIG B 1344" when Hardware Clock locked to the 1344 time-
code input and the Hardware Clock is the "synchronizing" NTP association for the NTP dae-
mon.
Timecode Output
Use the Timecode Output to configure the signal type on the IRIG Out connector.
The Cable Delay and Output Type settings only apply to the Timecode Output.
Cable Delay (nS): Compensates for delays caused by the length of the cable on the IRIG Out
connector. Use the table below to calculate the Cable Delay by selecting the signal propaga-
tion rate for the type of cable and multiplying it by the length of the cable.
Type Rate per foot Rate per meter
RG-58 1.4 nS/foot 4.59 nS/meter
RG-59 1.24 nS/foot 4.06 nS/meter
For example, a 50 foot length of RG-59 cable x 1.24 nS/foot = 62 nS of Cable Delay.
997-01520-02 Rev. F1.......................................................................... Page 71
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