8194B, 8195B, 8197B
Spectracom Corporation
GPS Ageless Master Oscillator Instruction Manual
5-16
5.7.5 RS-485
CTCSS Configuration
This RS485 command is used to change the settings of the CTCSS generators installed
in the unit. There may be one or two generator chips installed in the unit, resulting in 2
or 4 CTCSS frequencies output.
The format for the command is:
wctcC1C2C3C4
plus the normal header and footer.
C1, C2, C3, and C4 are the two-letter CTCSS code that has been selected to be output.
The following is a table of all the codes and their subsequent frequencies. (Note: the
output frequencies are not the exact CTCSS frequencies). The two-letter code MUST
be in Capital Letters.
If a CTCSS generator is not installed in the 8195A/8197 the command is simply ignored.
If only one generator is installed only the codes for that generator are used, the other
codes should be set to 00 (zero zero).
Also, the second CTCSS generator (C3 and C4) can only output frequencies that are
integers – 67.00, 72.00 are valid, 69.33 is not.
Examples:
Set CTCSS #1 to 69.33, #2 to 180.00, #3 & #4 are not installed.
wctcWZ6B0000
Set CTCSS #1 to 136.66, #2 to 127.33, #3 to 100.00, and #4 to 254.00.
wctc4Z3A1Z0Z
5.7.6 Model 1118 CTCSS
The Model 1118 CTCSS Tone Generator is used in conjunction with the Model 8195B
or 8197B Ageless Oscillator to generate precision synchronized CTCSS tones. The
master oscillator must be equipped with the appropriate Option 14 or Option 16 output.
There are two versions of the 1118: the 1118-2, a version with an enclosure; and the
1118-1, a rail mount version. This manual lists the pins and connectors for the 1118-2
first, then the pins and connections for the 1118-1 in brackets [ ].
The Spectracom CTCSS Tone Generator offers the following features:
•
Accuracy: Continuous self-calibrated to GPS provides
±
1.0 x 10
-11
frequency
accuracy.
•
PTT input and an adjustable delayed PTT output.
•
TIA compliant CTCSS reverse burst.
•
Inhibit input that disables CTCSS tone generation.
