Amateur Radio Stack Exchange
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Questions tagged [tone-squelch]

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.

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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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Why don't I hear the CTCSS tones when listening on the repeater input frequency?

I am newly licensed (Technician) and bought a UV-5RA as a cheap way to check out what's going on in my area and see if I'm finding it interesting enough to get a better UHF/VHF HT. The other day I was listening to a conversation happening on a local…
QuantumMechanic
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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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Advantages of using Digital Code Squelch

I am trying to decide whether or not I should use a CTCSS (Continuous Tone-Coded Squelch System) or a DCS (Digital Coded Squelch) for my mini repeater I just set up. What are the advantages of using a DCS over a CTCSS? I am in an area with a lot…
Skyler 440
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Kenwood TH-D72A: what's the difference between Tone and CTCSS?

Kenwood TH-D72A supports 3 types of tone: Tone, CTCSS and DCS. What is the difference between Tone and CTCSS? As far as I know CTCSS is basically a continuous transmission of a given low frequency signal mixed with the voice. So it's basically a…
Aleksander Alekseev - R2AUK
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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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Why does P25 occasionally break through tone squelch on my analog HTs?

When listening to our local repeater, which is now a combined P25/analog machine, every once in a while my squelch opens to a blast of digital noise. I've noticed this problem with at least two different Baofeng radios (a UV-3R+ and a UV-82). I have…
MoTLD
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MURS - Set to broadcast and receive on a specific CTCSS code

Context Using a Baofeng UV5RA Would like to transmit on MURS (e.g., 151.880 MHz) using a CTCSS code for more private discussions All of the online guides talk about scanning for CTCSS Question Rather than scanning, is it possible to just…
David
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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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Can two FM radios transmit two separate PL tones at the same time, and be received by two radios with matching PL tones?

Can two FM radios transmit two separate PL tones, and be received by two radios with matching PL tones? Or will the receivers hear a mix of the two, or nothing at all?
Evan Fosmark
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How do PL tones make it through so much noise?

So sometimes I hear people trying to get into a repeater with pure noise, and no audible audio on their transmission. With the repeaters that require a PL tone, how can the PL tones get through all of that noise if I can barely get DTMF through…
Skyler 440
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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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Trouble communicating between Baofeng and Midland walkies

I'm very new to walkies and radios, and I know next to nothing. My friends and I bought a box of Baofeng 888s radios (which apparently also go by quite a few other names and manufacturers) and I'm having trouble getting them to communicate with my…
Ezratic
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Can a repeater accept both tone burst and CTCSS?

I found a repeater than in a listing it says it accepts both, the 1750Hz tone burst, and a CTCSS code. Is this possible or is the listing wrong?
Pablo Fernandez
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Performance gain when turning off CTCSS/DCS?

By turning of CTCSS/DCS can there be an increase in performance*? *Performance: Battery life Latency Range Voice quality From what I understand CTCSS/DCS is extra work for the IC inside the radio. Of course it is going to be minuscule, but will…
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