вторник, 25 мая 2010 г.

QAM: Telemetry of service of high-voltage lines.

Telemetry of service of high-voltage lines. Main channel: QAM-32, Br - 3200. Two add channels: QAM-X, Br - 66.7


Author: SergUA6
Band Width 4000 Hz
Low Range ~560 Hz, in this example
Baud Rate 3200 Main Ch, 66.7 add ch Hz
n-Ary (PSK/MPSK) QAM-32 Main Ch, QAM-? add ch
Count of Carriers 3 One main channel & two additionaly
RX mode Source I/Q record

Sonograms:

pic.1 Generall view


Diagrams:

pic.2 Phase constellation of the main channel


Telemetry of service of high-voltage lines - an example of the signal of Russian equipment AWS1,2,3-CM - in russian abbriviation(transcrition), equaly on english as Digital Modify Special System Service & Communication-1,2,3. This equipment is used to service the high-voltage air-lines, working in range LW/LF. Production of "Neptune" factory. In the resulted example, the main channel works in mode QAM-32 with the maximum technical speed 16000 bps. There are also two relatively low speed technical auxiliary channeles, in which QAM modulation can be used also.