Vendor Names
CTCSS is often called PL tone (for Private Line, a trademark of Motorola), or simply tone. General Electric's and Bendix King's implementation of CTCSS is called Channel Guard (or CG). Vintage RCA radios called their implementation Quiet Channel. Icom radios this feature C.Tone Kenwood radios call the feature Quiet Talk or QT. Johnson used "TG" for "ToneGuard", and later "CG" for "CallGuard". Zetron literature refers to "ToneLock", and Ritron, Inc. labels their implementations "Quiet Call" (QC) and "Digital Quiet Call" (DQC). 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.
In amateur radio, the terms PL tone, PL and simply tone are used most commonly. Often, there is a distinction between the terms tone and tone squelch, in which the former refers to the use of transmitting a CTCSS tone while using standard carrier squelch on the receiver. Use of transmit-only CTCSS allows stations to communicate with repeaters and other stations using CTCSS while the link is marginal and the CTCSS tones may not be properly decoded. The term tone squelch most often includes tone and your radio will not only transmit a CTCSS tone to the distant station or repeater, but will squelch all incoming signals that do not also include the CTCSS tone. This is helpful in areas where multiple repeaters may be sharing the same output frequency but have different CTCSS tones, or where local interference is too strong for the front-end of your radio.
Read more about this topic: Continuous Tone-Coded Squelch System
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