PACTOR-IV ARQ

CHIRP + SPREAD + SERIAL TONE

(56.25 Bd / 112.5 Bd / 225 Bd / 1800 Bd)

FFT SPECTRA

FFT-spectrum vs. time, frequency and signal intensity (2-tone Chirp + Spread-16)

FFT-spectrum vs. time, frequency and signal intensity (Spread-16 + Spread-8)

FFT-spectrum vs. time, frequency and signal intensity (1800 Bd serial tone + Spread-16)

The following table shows the various speed levels used in Pactor-IV:

Speedlevel	Modulation	Raw datarate	Coding	Net datarate
1	2-tone Chirp	112.5 bps	1/2	46.9 bps
2	112.5 Bd DQPSK, Spread-16	225 bps	1/2	85.32 bps
3	112.5 Bd DQPSK, Spread-16	225 bps	5/6	147.2 bps
4	225 Bd DQPSK, Spread-8	450 bps	5/6	300.8 bps
5	BPSK, 1800 Bd Serial tone	1800 bps	1/3	433.1 bps
6	BPSK, 1800 Bd Serial tone	1800 bps	5/6	1096.5 bps
7	QPSK, 1800 Bd Serial tone	3600 bps	5/6	2199.5 bps
8	8-PSK, 1800 Bd Serial tone	5400 bps	5/6	3304.5 bps
9	16-QAM, 1800 Bd Serial tone	7200 bps	5/6	4407.5 bps
10	32-QAM, 1800 Bd Serial tone	9000 bps	5/6	5512.5 bps

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