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Clicks: 3021          Author:miklor
  • What is a CTCSS (PL) Tone?

    A CTCSS is a 'Tone' sent along with your voice when you transmit.
    It is Sub-Audible. You can't hear it, but a receiver or repeater can.
    The 'Tone' on your TX must match the tone required by the RX on the other end.

    CTCSS is part of a repeater's receiver that allows only signals with the proper "Tone" to access or open the receiver.  This allows distant repeaters using a different CTCSS to co-exist on the same frequency.
    Some, but not all, repeaters will transmit a CTCSS Tone back.
    If the repeater you are trying to listen to is not transmitting a tone, but you have programmed your receiver to require one, you will not hear that repeater.
    For this reason, DO NOT initially program your radio's receiver to require a tone. Program your transmitter ONLY to match the repeater you are trying to access.

    Avoid using CTCSS on simplex channels.  You must retain the ability to hear others currently using the same frequency to avoid interfering with existing conversations. 

    Adding these tones in no way guarantees privacy or security of any type. It is used to block out reception of other signals using the same frequency.  Any receiver that does not have CTCSS/DCS tones activated on their radio's receiver will be able to hear your transmissions.
    A video discussing this can be found HERE.
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