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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 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 ...
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Private Channel?

Is there a method to limit the people with access to a simplex channel? I would like to utilize a channel that is set up for just myself and my wife. If I gave directions to meet somewhere I would ...
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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 ?
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How to connect a motorola RVA50UL with MR350?

Currently I use a Motorola MR30R radio in the frequency 20 (462,6750 Mhz) with Interference Eliminator Code 59. I also have a Motorola RVA50UL, according to the manual, the frequency will be available ...
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1answer
1k views

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 ...
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Baofeng not finding CTCSS tone

I have this Baofeng and I want listen to my school radios. The problem is that I want to find the CTCSS tone for the fun of it, but when I scan the tones on the Baofeng it cycles through but does not ...
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2answers
761 views

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 ...
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3answers
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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 ...
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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 ...
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682 views

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?
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2answers
176 views

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 ...
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339 views

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?
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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 ...