[op25-dev] Why can't I hear fire tones?
Andrew Porrett email@example.com [op25-dev]
op25-dev at yahoogroups.com
Sun May 20 21:24:33 UTC 2018
At 11:35 AM 20-05-2018, nokoa3116 at gmail.com [op25-dev] wrote:
>Do the tones not go like voice over radio.
> Is it like a code that the scanner then changes into a beep?
Yes. Tone frames encode a frequency index and a volume level. A
receiver has to synthesize the indicated tone/volume for 20 ms per frame.
Page 20 has a list of AMBE tones:
A slightly different list is found on page 58 here:
IMBE tone frames are likely similar.
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