PL Tone Chart from RepeaterBuilder.com
CTCSS - Continuous Tone Coded Squelch System:
Also known as : PL - Private Line, Tone Squelch, Sub-Channel, Tones, etc.
PL is an acronym for Private Line. This is Motorola's proprietary name for CTCSS. The use of this term is probably the primary reason there is so much confusion
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