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Sub-audio
CTCSS (Continuous Tone Coded Squelch System)
is a technology that adds a frequency (67-254.1Hz) lower than the audio
frequency to the audio signal for transmission. It is also known as sub-
audio because its frequency range is below the standard audio, i.e., less
than 300Hz.
CDCSS (Cont inuous Digital Coded Squelch System)
is a continuous digital coded squelch system that serves the same
purpose as CTCSS but uses digital encoding as the condition for
determining whether the squelch is open. It consists of a fixed code
group that is continuously transmitted. It is also called sub-audio digital
or digital sub-audio because its frequency is also below 300Hz.
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In the non-standard analog sub-audio editing state, non-standard sub-
audio can be directly input.
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FM Radio Function
Press the "FM Key" to activate the FM radio function, and the screen will
display the current frequency.
Use the "Up" and "Down" keys to adjust the radio frequency, or directly
input the frequency using the keypad (frequency range:
65.000~108.000MHz). Pressing the "A/B Key" while in radio mode will
enter the auto search mode.
Press the "FM Key" again to exit the FM radio mode.
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Tone Function
