REFERENCES Tab
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, 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: The Antenna Cable Delay option is used to compensate for the signal delay caused by
the GPS antenna cable. Do not use this setting to compensate for the length of the Timecode
Output cable, use REFERENCES, IRIG-B instead.
REFERENCES-IRIG-B
Note: This option is not available for the S200 model.
Use this page to configure the IRIG In and IRIG Out connectors on the rear panel.
Locked: (Yes, No) Indicates the presence of a valid IRIG input.
Input Mode (IRIG In connector) and Output Mode (IRIG Out connector):
n
IRIG-B: Standard IRIG-B 123 time code.
n
IRIG-B (Legacy TrueTime): Standard IRIG-B with four time-quality bits and a lock indicator
encoded in the control bits.
n
IRIG-B with IEEE 1344 extension: Standard IRIG-B with information encoded in the control
bits per the IEEE 1344 standard.These include year, daylight saving time, leap second,
time quality, and parity information.
n
Auto: (Input Mode only) Automatically selects one of the modes above, based on the
incoming signal.
NOTE: IRIG-1344 only provides a leap warning during the last minute of the day of the
event. In this case, while the SyncServer will propagate that information via NTP, most NTP
clients will not query the SyncServer in time to be warned of the leap event.
Output Type: Set the type of time encoded in the IRIG-B time code output.
n
UTC: Standard IRIG encodes UTC. This is the factory default setting.
n
Local: Non-standard IRIG encoded with the local time offset instead of UTC. See the
TIMING - Time Zone page for information on setting the local time.
Cable Delay (nS): Compensate for the time delay in the output cable. This adjustment is used
to put the end of the output cable “on-time”. Select the signal propagation rate from the table
below and multiply it by the length of the cable to arrive at the cable delay.
RG-58 1.4 nS/foot 4.59 nS/meter
RG-59 1.24 nS/foot 4.06 nS/meter
See IRIG-B (S250i and S250) (see "IRIG-B" on page 173) default settings
997-01520-02 Rev. G2.......................................................................... Page 51
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