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CTCSS encoder kit - crystal controlled - 47 tones (for Repeater access) | eBay
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To tone or not to tone: That is the question – Fort Wayne Radio Club
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16 Tone DTMF Generator Keypad 1234567890*#ABCD, 1750Hz tone burst, and CTCSS functionality:Amazon.com:Appstore for Android
How radio "privacy tones" or CTCSS tones work. - YouTube
CTCSS Tone and Encoder - Resource Detail - The DXZone.com
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