Polarity Of Psk-31; Psk-63F And Psk-125F - Wavecom W40PC Manual

precisely set The precision of the center frequency is very important and directly
influences the performance of the decoding.
To ensure, that the system can handle drifting signals or a coarsely adjusted center frequency,
"AFC" may be enabled in the "Demodulator" menu. The carrier tracking function is now
activated If the deviation between the tracked and the adjusted center frequency is too large,
the center frequency should be corrected. The carrier tracking only works over a range of:
Hence adjustment of the center frequency must be accurate.
The tuning display indicates, if a DBPSK or a DQPSK signal is being received. Two bars
mean DBPSK, four bars DQPSK. The demodulator must be adjusted accordingly.

Polarity of PSK-31

If a LSB signal is received using the receivers USB position or vice versa, the phase-plane is
mirrored on the horizontal axis. For a DBPSK signal this has no effect, because all the phase
states are on the horizontal axis itself. For DQPSK however this must be considered by
switching the polarity. This can be done in the menu "Demodulator" by switching "Polarity" or
with a double-click on the field on the left side of the status field.

PSK-63F and PSK-125F

Parameter
Frequency range
Frequency Europe
System
Baudrate
Carrier Modulation
WAVECOM Decoders v6.15 W40PC, W41PC, W51PC
To carry over these values to the demodulator, press the UPD (update
cursor parameters) button.
•
DBPSK Center ± 8 Hz
•
DQPSK Center ± 4 Hz
Value
HF
3.580 MHz, 7.035 MHz, 14.070 MHz
STANDARD, Amateur System
62.5 and 125 Baud
DBPSK
Transmission Modes • 179