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Transmission Modes WAVECOM Monitoring System W-SPECTRA, W-SPEED Manual V1.1.0
TWINPLEX
TWINPLEX (F7B) is a FSK modulation technique with four modulation frequencies. Two transmission chan-
nels V1 and V2 are obtained through a combination of the modulation frequencies.
SITOR-TWINPLEX systems employ the second channel to double the data transmission rate from the
equivalent of 50 Bd to 100 Bd. The V1 and V2 channels each contain 3 telegraph characters from the SI-
TOR alphabet.
100 Bd, variable 30-650 Bd
Twinplex transmissions can have widely varying shifts. Seven standard combinations are available from
the Shift item of the Demodulator menu:
100-100-100 Hz
200-400-200 Hz
170-170-170 Hz
115-170-115 Hz
200-200-200 Hz
115-170-515 Hz
65-170-65 Hz
In addition, any desired combination may be programmed.
In addition to shift variations, Twinplex systems may utilize very different keying assignments. On the V1
and V2 channel the software allows the selection of Y-Y-B-B, Y-B-Y-B, B-Y-Y-B, B-Y-B-Y, Y-B-B-Y settings
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