SteveShannon Posted Wednesday at 02:34 PM Report Posted Wednesday at 02:34 PM 18 minutes ago, Jaay said: Has Anyone noticed, that the Original poster, "Suburbazine" asking the question has never replied to any of your responses ? @Suburbazine only posted three times and hasn’t been here since November. That’s not uncommon. I think a lot of people make a few posts and then move on. Jaay 1 Quote
tweiss3 Posted Wednesday at 02:44 PM Report Posted Wednesday at 02:44 PM 9 hours ago, SteveShannon said: I don’t think it’s technically possible. CTCSS is a continuous tone that’s transmitted in conjunction with speech. If you try to modulate it somehow, you either end up with a non-continuous tone or a different tone. Likewise DTCSS sends a very small digital code over and over. If you try to overlay other data you’ve changed the code. But digital data is not prohibited anyway so why futz around with the CTCSS and DTCSS? Just send digital data. There are limits but those limits are less limiting than trying to repurpose the squelch control system. It's not impossible to have low baud data in the CTCSS portion of a wide band signal, but it's very slow data, and you really then need to do modifications to the radios so that you can hear and decode the data in that portion of the transmission. You do loose your signal selectivity of Tone/DCS though. I was talking with a friend who has a 3 repeater system, and he is working on building a data dashboard using the low baud data from the RF links as described above. It is quite the project, and as mentioned, very slow data. SteveShannon 1 Quote
SteveShannon Posted Wednesday at 02:58 PM Report Posted Wednesday at 02:58 PM 12 minutes ago, tweiss3 said: It's not impossible to have low baud data in the CTCSS portion of a wide band signal, but it's very slow data, and you really then need to do modifications to the radios so that you can hear and decode the data in that portion of the transmission. You do loose your signal selectivity of Tone/DCS though. So it breaks the “privacy” functionality? Quote
tweiss3 Posted Wednesday at 03:01 PM Report Posted Wednesday at 03:01 PM 1 minute ago, SteveShannon said: So it breaks the “privacy” functionality? Correct, it does. I should say, the system he is working on is amateur radio, not GMRS, but the concept is not exclusive to any portion of FM radio. SteveShannon 1 Quote
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