Section 5: Options and Accessories
Page 5-12
8197 Instruction Manual
The 64-kHz and 18-kHz Data Sync outputs are derived from the 10-MHz GPS
disciplined oscillator. *The 64-kHz signal is changed to 50-kHz on units equipped
with Option 06, 12.8 MHz outputs.
The CTCSS #1 and CTCSS #2 outputs are derived from the 10-MHz GPS
disciplined oscillator and are triggered by the GPS 1PPS output. Using the 1PPS
offset command, 1PO, these outputs can be offset from 0 to 1 second in 0.1
microsecond steps. Refer to Section 4 for additional information on the 1PO
command. The leading edges of the CTCSS #1and CTCSS #2 outputs are
synchronized within ±2 microseconds ( ±0.25°) of the Data Clock 1PPS output.
CTCSS #1 and CTCSS #2 can be configured to provide any frequency listed in
Table 5-4. The default CTCSS frequency is 67.00 Hz. Refer to section 5.7.4 for
information on configuring the CTCSS outputs.
CTCSS FREQUENCIES (Hz)
67.00 69.33 72.00 74.33 77.00 79.66
82.66 85.33 88.66 91.66 94.66 97.33
100.00 103.66 107.33 111.00 114.66 118.66
123.00 127.33 131.66 136.66 141.33 146.33
151.33 156.66 162.33 168.00 173.66 180.00
186.33 192.66 203.66 206.66 210.66 218.00
225.66 229.00 233.66 241.66 250.33 254.00
TABLE 5-4 CTCSS #1 AND CTCSS #2 FREQUENCY LIST
5.7.2 Data Sync Alarm Contacts
Major Alarm relay contacts are found on Pins 10, 11 and 12 of the Data Sync
connector. A Major Alarm is asserted whenever any of the following alarm
conditions exist: Frequency, Tracking Alarm 2, Tracking Alarm 3, CPU or the
unit is placed in Test Mode.
During normal operation, the Major Alarm relay is energized. The energized
relay causes continuity between the common contact, Pin 10 and the normally
open contact, Pin 11.
A Major Alarm or power failure de-activates the relay causing continuity between
common, Pin 10 and normally closed, Pin 12. The relay remains in alarm
condition until the fault is corrected or reset by the clear alarm, CA, command.