COFDMTV

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COFDMTV
COFDMTV2.png
Mode SSB,FM,AM
Modulation COFDM,8-PSK,QPSK
ACF
Emission Designator
Bandwidth 1.6 kHz,2.5 kHz,2.7 kHz,3.2 kHz,2.25 kHz,2.4 kHz
Location
Short Description COFDMTV is an easy-to-use picture transmission mode based on Coded Orthogonal Frequency-Division Multiplexing (COFDM).
I/Q Raw Recording
Audio Sample

The modes below use a 2/3-rate shortened systematic polar code and are differentially modulated:

using SPC(64800, 43072):
mode 6: 8PSK8-Phase Phase-Shift Keying (3 bits per symbol), 2700 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). BW and about 10 seconds long
COFDMTVmode6wf.png

mode 7: 8PSK8-Phase Phase-Shift Keying (3 bits per symbol), 2500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). BW and about 11 seconds long
COFDMTVmode7wf.png

mode 8: QPSKQuadrature Phase-Shift Keying (2 bits per symbol), 2500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). BW and about 16 seconds long
COFDMTVmode8wf.png

mode 9: QPSKQuadrature Phase-Shift Keying (2 bits per symbol), 2250 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). BW and about 18 seconds long
COFDMTVmode9wf.png


using SPC(64512, 43072):
mode 10: 8PSK8-Phase Phase-Shift Keying (3 bits per symbol), 3200 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). BW and about 9 seconds long
COFDMTVmode10wf.png

mode 11: 8PSK8-Phase Phase-Shift Keying (3 bits per symbol), 2400 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). BW and about 11 seconds long
COFDMTVmode11wf.png

mode 12: QPSKQuadrature Phase-Shift Keying (2 bits per symbol), 2400 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). BW and about 16 seconds long
COFDMTVmode12wf.png

mode 13: QPSKQuadrature Phase-Shift Keying (2 bits per symbol), 1600 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). BW and about 24 seconds long
COFDMTVmode13wf.png

The modes allow for a payload of up to 5380 bytes. COFDMTV is based on COFDMCoded Orthogonal Frequency-Division Multiplexing (coded orthogonal frequency-division multiplexing) technology:


  • 160 msmilliseconds (.001 of a second) long OFDMOrthogonal Frequency-Division Multiplexing symbols
  • 6.25 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). per sub-carrier
  • 1⁄8 guard interval
  • Differentially encoded PSKPhase-Shift Keying (phase-shift keying) modulation
  • Systematic polar codes for forward error correction





Frequencies[edit]

This mode is often used on UHFCB, PMR446, and FRS.

Video Example[edit]

Decoding Software[edit]

Additional Links[edit]