NeFire242 said:
Not sure if anyone has ever followed this little plan, but here the APCO people suggest the following NAC codes for PL tones.
I've never found if any agency who uses mix-mode or who use to use analog and is now digital uses this plan or not.
Not an APCO document and obsolete.
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CTCSS to NAC Conversion
Early TIA documents specifi ed a formula for converting analog CTCSS
tones and DCS codes to specifi c NAC codes. Those documents have
since been removed and the selection of NAC codes has been left
to the user. Some government agencies have defi ned a conversion
table for their own use for translating CTCSS to NAC codes (eg. State
of California and others).
Shown below is the early TIA conversion table from CTCSS to
NAC codes. These codes were determined by taking the CTCSS
frequency and multiplying it by ten, then converting the integer result
to a hexadecimal number.