When purchasing a walkie-talkie, you will find CTCSS, CDCSS, DCS, DTCS, QT, DQT, PL, TPL, and DPL in the function introduction… These are the sub-audio functions that represent the walkie-talkie. Then the question comes, how is the sub-tone of the walkie-talkie divided? How does the subsonic function prevent interference? Here is the answer for everyone. […]