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James Sharp james at fivecats.orgOn 12/9/2013 7:33 AM, Chris Hanson wrote: > Thanks for the response. I looked at the code and from what I can tell, > it’s just using various ham radio rigs built in CTCSS facilities and > programming them via RS232. Am I missing something? The app_rpt file has some functions to detect tones in an audio stream that can be used to detect the CTCSS tones. Look through the "tone_detect" function along with the goertzel_* functions. They're not specifically tagged as functions to decode CTCSS tones, but they should be able to be used as such. Those functions are expecting to be fed a 16-bit signed linear mono audio stream.