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14
UNDERSTANDING SCANNING
What is CTCSS/DCS?
Your scanner can monitor systems using a Continuous Tone
Coded Squelch System (CTCSS) and Digital Coded Squelch (DCS)
system, which allows the squelch to open only when the tone
you have programmed with a speci c frequency is received
along with a transmission.
CTCSS and DCS are sub-audible tone signaling systems
sometimes referred to as PL or DPL (Motorolas trademarked
terms for Private Line and Digital Private Line respectively).
CTCSS and DCS are used only for FM signals and are usually
associated with both amateur and commercial two-way
frequencies. These systems make use of a special sub-audible
tone that accompanies a transmitted signal.
CTCSS and DCS are used for many purposes. In many cases,
CTCSS and DCS are used to restrict access to a commercial
repeater, so that only those units which transmit the correct
tone along with their signal can “talk to the repeater.
CTCSS and DCS are also used in areas that receive interference
where there are several stations with output frequencies close
to each other. When this occurs, you might hear multiple
communications on the same frequency. The stations
might even interfere with each other to the point where it is
impossible to clearly receive any of the stations. Your scanner
can code each received frequency with a speci c sub-audible
CTCSS tone or DCS code. Then, when you receive multiple
signals, you only hear the transmission with the CTCSS or DCS
tone you programmed. If you do not receive the correct tone
UB374ZV_UBC125XLT_130329.indd 14UB374ZV_UBC125XLT_130329.indd 14 2013/03/29 10:34:502013/03/29 10:34:50
14


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  • Why is the volume very low on my scanner?.Unable to hear anything,but when I insert headphones the volume is very loud Submitted on 27-6-2023 at 13:02

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  • When I press scan it only moves on to the next frequency I have stored and the next and so on. It does not scan the frequencies. Any ideas Submitted on 3-4-2020 at 01:07

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