PSK:TETRA - DMO, terminal to terminal connection

TETRA - DMO, terminal to terminal connection

Direct Mode Operation, Br-18000, pi/4 DQPSK

Perfect example of TETRA-DMO signal, send by geka.

Author: SergUA6

Band Width ~25000-26000 Hz

Baud Rate 18000 Hz

n-Ary (PSK/MPSK) pi/4 DQPSK

Carrier frequency 15639 Hz, in this example only!

RX mode source I/Q record

Sonograms:

pic.1 Generall view

pic. Manipulation speed

pic.3 Getting of carrier frequency

Diagrams:

pic.4 Generall frame structure

Pictures:

pic.5 Constellation

TETRA - DMO, terminal to terminal connection - the mode of direct terminal (mobile stations, phones etc) connection of TETRA standard, without participation of base stations equipment.