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downlink_tone [2019/02/10 22:44]
kd6kpc [DCS Codes] |
downlink_tone [2019/02/10 22:45]
kd6kpc |
| ====== Downlink Tone ====== | ====== Downlink Tone ====== |
| Tones are often attached to a repeater's [[uplink_frequency|uplink frequency]] to control access or limit noise/interference. In the commercial radio applications and invented by Motorola, the term is known as PL, which was short for [[https://en.wikipedia.org/wiki/Private_line|Motorola Private Line]]. In the amateur radio community, the non-propriety term of [[https://en.wikipedia.org/wiki/Continuous_Tone-Coded_Squelch_System|Continuous Tone-Coded Squelch System, or CTCSS]], if often used. | These tones have many names: |
| | * PL tone |
| | * CTCSS |
| | * sub-audible tone |
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| | Tones are often attached to a repeater's [[uplink_frequency|uplink frequency]] to control access or limit noise/interference. In the commercial radio applications and invented by Motorola, the term is known as PL, which was short for [[https://en.wikipedia.org/wiki/Private_line|Motorola Private Line]]. In the amateur radio community, the non-propriety term of [[https://en.wikipedia.org/wiki/Continuous_Tone-Coded_Squelch_System|Continuous Tone-Coded Squelch System, or CTCSS]], if often used. |
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| These tones were originally analog only (see chart below). Later, a digital method was also introduced known as [[https://en.wikipedia.org/wiki/Squelch#DCS|Digital Coded Squelch, or DCS]]. These methods are only used on analog systems. Other methods for controlling access are available for different transmission modes and are discussed on their respective pages. | These tones were originally analog only (see chart below). Later, a digital method was also introduced known as [[https://en.wikipedia.org/wiki/Squelch#DCS|Digital Coded Squelch, or DCS]]. These methods are only used on analog systems. Other methods for controlling access are available for different transmission modes and are discussed on their respective pages. |
