Tone squelch, or CTCSS (Continuous Tone-Coded Squelch System) is a mechanism by which the presence of a specific frequency in the transmitted audio is used to open a receiver squelch, rather than relying simply on the presence of a strong enough signal.
Questions tagged [tone-squelch]
26 questions
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Why are PL tones strange numbers?
PL tones have very specific odd numbers with a decimal place like 103.5 or 107.2 or 88.5. The only PL tone that does not have this decimal is the 100.0 hertz tone.
Why don't they just use integers with a standard increment of lets say 10 hertz so…
Skyler 440
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PL tone removal?
How are PL tones (CTSS, et.al.) typically removed from the audio of received VHF FM repeater signals?
Is it done with a fixed high-pass filter? Or a notch, when using a transceiver with the PL tone configured correctly? Or dynamically, by assuming…
hotpaw2
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Would it be possible to transmit all CTCSS tones at once?
What happens if all CTCSS tones are transmitted at once? Would it trip all radios listening on that frequency?
Richard Hum
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alinco dr-635T receive squelch will not open in DCS mode
Newbie here with a question:
I have programmed my Alinco DR-635T for use with a variety of local repeaters. Half of these are opened with CTCSS codes and the rest with DCS codes. When monitoring any of the CTCSS repeater frequencies, the Tx/Rx diode…
niels nielsen
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Receiving without configuring CTCSS
I'm interested in listening to the local EMS/Fire transmissions around here and was wondering if I have to configure the CTCSS/PL tones on the radio in order to hear those transmissions.
I understand that a PL tone is used to create sub-banding in…
Andrew
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Software to decode selective calling tones
I have a wav file that has a selective calling tone in it. Is it possible to decode a selective call tone from a wav or mp3 file ?
user657491
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BaoFeng UV-82 CTCSS TX static
Having an issue with CTCSS tones on the UV82. The radios seem to be transmitting an audible background sound when CTCSS TX tones are enabled. This comes through as a slight but noticeable audible buzz when talking UV82 to UV82 and almost…
