FST4W

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FST4W
NoWaterfallFiller.png
Frequencies 136 kHz,474.2 kHz,1.839 MHz
Frequency Range 136 kHz - 1.839 MHz
Mode USB
Modulation 4-GFSK
ACF
Emission Designator
Location Worldwide
Short Description FST4W is an amateur radio digital protocol designed particularly for the LF and MF bands, for quasi-beacon transmissions of WSPR-style messages. FST4W uses 4-GFSK modulation and offers T/R sequence lengths of 120, 300, 900, and 1800 seconds.
I/Q Raw Recording
Audio Sample

FST4W is an amateur radio digital protocol designed particularly for the LF and MF bands, for quasi-beacon transmissions of WSPR-style messages. FST4W uses 4-GFSKGaussian Frequency-Shift Keying modulation and offers T/R sequence lengths of 120, 300, 900, and 1800 seconds.

FST4W do not require the strict, independent time synchronization and phase locking of modes like EbNaut. FST4W-120 SNR threshold is about 1.4 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal. lower than WSPR.

Frequencies[edit]

  • 136 kHzKiloHertz (kHz) 10^3 Hz
  • 474.2 kHzKiloHertz (kHz) 10^3 Hz
  • 1.8366 MHzMegaHertz (MHz) 10^6 Hz
Basic parameters of all FST4W submodes
T/R period (s) Symbol length (s) Tone spacing (HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).) Bandwidth (HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).) SNR (dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal.)
120 0.683 1.46 5.9 -32.8
300 1.792 0.56 2.2 -36.8
900 5.547 0.18 0.72 -41.7
1800 11.200 0.089 0.36 -44.8

Decoding Software[edit]

Additional Links[edit]