TETRA

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[TETRA] (Terrestrial Trunked Radio) is certainly out there, if you look for it. Even with simple AM demodulation, you can hear the characteristic ['buzz'].

If you want to read some TETRA-related bunkum, check out [TETRA Watch]. At least that particular page has those two pictures of the waveform and spectrum!

TETRA's Magic Numbers
Property Value
Modulation π/4 DQPSK
Symbol rate 18000
Bit rate 36000
Slots/frame 4
Frame length 255 symbols (56.7ms)
Frames rate 17.65Hz
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