Excerpt
Old Document, but here is the pdf excerpt.
Also be aware many of the ranger units are going to narrow band operation
for local nets starting in 2009
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With the exception of HUU and RRU, the assigned CTCSS tone is the same number as the
second digit of the unit designator. Example; TGU unit designation is “2500”, which equates to CTCSS “Tone-5” (146.2Hz) CZU unit designation is “1700”, which equates to CTCSS “Tone- 7” (167.9Hz)
Exception to standard CTCSS assignments; HUU unit designation is “1200”, assigned CTCSS is “Tone-1” (110.9Hz) RRU unit designation is “3100”, assigned CTCSS is “Tone-13 (141.3Hz)
Note: These exceptions are needed to ensure protection from other radio nets. CDF
Command Nets 1 through 10 have been assigned “Tone-8” (103.5Hz), statewide. This
assignment will provide protection from co-channel CDF Local Nets.
CDF Command Nets 1 and 2 will not be CTCSS protected, since these frequencies are
assigned exclusively, statewide, to CDF. In the future, out-of-state radio interference may
require CTCSS protection for these nets.
CDF Tactical Channels will not be CTCSS protected. Tone protection may eventually be
assigned to selected channels to eliminate co-channel interference, should it develop.
CDF, US Forest Service, and US Bureau of Land Management have agreed on the
following standard CTCSS tone assignments:
Tone-1 110.9 Hz
Tone-2 123.0 Hz
Tone-3 131.8 Hz
Tone-4 136.5 Hz
Tone-5 146.2 Hz
Tone-6 156.7 Hz
Tone-7 167.9 Hz
Tone-8 103.5 Hz
Tone-9 100.0 Hz
Tone-10 107.2 Hz
Tone-11 114.8 Hz
Tone-12 127.3 Hz
Tone-13 141.3 Hz
Tone-14 151.4 Hz
Tone-15 162.2 Hz
Tone-16 192.8 Hz
