WAVECOM Decoder W-PCI/e, W-CODE, W

 Try and view the phase plane of the signal using the DPSK demodulator. If the signal is a PSK signal, the phase plane should be visible.

 If the DPSK demodulator failed to produce a meaningful display, try the IQ demodulator. This requires accurate adjustment of the reference signal to produce a meaningful display.

PSK Code Check (HF, DIR and SUB)

PSK code check is started by selecting the PSK Code Check button or from HF-Modes | Analysis | PSK

Code Check.

The PSK code check is initialized with default values. In many cases the user needs to set up the following values:

 center frequency

 baudrate

 number of channels

 bandwidth (use the pb tuning to enter the correct bandwidth

The center frequency can be set by using the cursors in the FFT Window as shown below, or by selecting

Center in the Demodulator menu. The baud rate can also be configured.

The number of channels is set to one for all single channel modes and to two for two channel modes like

PACTOR II/II-FEC. Modes with more than one channel need the shift settings in addition to the center frequency.

Note: The accuracy of the center frequency and shift settings is very important and directly influences the

performance of the decoding.

After each configuration change, the PSK code check automatically restarts with the new values. The values of these parameters are displayed in the appropriate fields after the setting has completed.

If two or more different systems are identified, or if more than five proven transmission errors occur, an automatic switch to a mode will not take place.

The software then proceeds with code and system analysis. The incoming bit stream is tested and compared against known PSK modes.

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Analysis Tools WAVECOM Decoder W-PCI/e, W-CODE, W-CLOUD Manual V8.3.00