Ctcss/Dcs - Radioddity GA-2S User Manual

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10. QT/DQT (CTCSS/DCS)
QT/DQT (CTCSS/ DCS) is the sub-audible signaling, to prevent the radio from
receiving unwanted signals on the same frequency. When CTCSS/DCS is set, then
within the communication range, you can only receive signals from the same
frequency with the same QT/DQT setting. When the QT/DQT is off, you will get all the
signals from the same frequency within the communication range.