A historical and technical overview of tone squelch (PL, CG, QC, CTCSS, etc.) systems.
Understanding CTCSS and DCS - YouTube
CTCSS DCS Tone Decoder And Frequency Counter - YouTube
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Two Simple CTCSS Encoders
CTCSS/DCS/SelCall Processor
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Two Simple CTCSS Encoders
Detecting CTCSS tones with Goertzel's algorithm - Embedded.com
Differences between CTCSS and DCS - Two Way Radio Community
Two Simple CTCSS Encoders
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Two Simple CTCSS Encoders
CTCSS Fast decode with Arduino UNO - YouTube
Testing CTCSS and DCS with the R&S®CMA180 Radio Test Set - YouTube
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Developing a CTCSS Decoder
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