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CTCSS and DCS inly control your squelch. If you all have it set you only hear the transmissions that have the same code as you, by having the same code your squelch opens up. However if you have a radio which you can turn off the code you will hear all transmissions including those which are being transmitted with a CTCSS or DCS code enabled. Thus includes the cheap blister pack radios you just set the code to 0.
With CTCSS or DCS you only control the squelch and you are not encrypting anything.
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