Editing Squelch (section)

===CTCSS===
{{Main|Continuous Tone-Coded Squelch System}}

'''CTCSS''' (Continuous Tone-Coded Squelch System) continuously superimposes any one of about 50 low-pitch audio [[pitch (music)|tone]]s on the transmitted signal, ranging from 67 to 254 [[Hertz|Hz]]. The original tone set was 10, then 32 tones, and has been expanded even further over the years. CTCSS is often called ''PL tone'' (for ''Private Line'', a [[trademark]] of [[Motorola]]), or simply ''tone squelch''. [[General Electric]]'s implementation of CTCSS is called ''Channel Guard'' (or ''CG''). [[RCA|RCA Corporation]] used the name ''Quiet Channel'', or ''QC''. There are many other company-specific names used by radio vendors to describe compatible options. Any CTCSS system that has compatible tones is interchangeable. Old and new radios with CTCSS and radios across manufacturers are compatible.{{cn|date=April 2023}} For those PMR446 radios with 38 codes, the codes 0 to 38 are CTCSS Tones:

{| class="wikitable"
| colspan="6" |'''PMR446 CTCSS Privacy Codes'''{{cn|date=April 2023}}
|-
|'''Number'''
|'''Tone Hz'''
|'''Number'''
|'''Tone Hz'''
|'''Number'''
|'''Tone Hz'''
|-
|'''0'''
|Off 
|'''13'''
|    103.5
|'''26'''
|   162.2
|-
|'''1'''
|      67.0
|'''14'''
|   107.2
|'''27'''
|   167.9
|-
|'''2'''
|      71.9
|'''15'''
|   110.9
|'''28'''
|   173.8
|-
|'''3'''
|      74.4
|'''16'''
|   114.8
|'''29'''
|   179.9
|-
|'''4'''
|      77.0
|'''17'''
|   118.8
|'''30'''
|   186.2
|-
|'''5'''
|      79.7
|'''18'''
|   123.0
|'''31'''
|   192.8
|-
|'''6'''
|      82.5
|'''19'''
|   127.3
|'''32'''
|   203.5
|-
|'''7'''
|      85.4
|'''20'''
|   131.8
|'''33'''
|   210.7
|-
|'''8'''
|      88.5
|'''21'''
|   136.5
|'''34'''
|   218.1
|-
|'''9'''
|      91.5
|'''22'''
|   141.3
|'''35'''
|   225.7
|-
|'''10'''
|      94.8
|'''23'''
|   146.2
|'''36'''
|   233.6
|-
|'''11'''
|      97.4
|'''24'''
|   151.4
|'''37'''
|   241.8
|-
|'''12'''
|    100.0
|'''25'''
|   156.7
|'''38'''
|   250.3
|}