SCS PTC-IIex, Manual

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8 FAX
8.9.5 FSKBaud
Default setting: 3
Parameter: 2 200 Baud.
3 300 Baud.
4 400 Baud.
Gives the maximum possible baud rate that the NFSK-demodulator can process without
inter-symbol interference (ISI, signal-smearing). With noisy signals, it is recommended
that the
FSKBaud
parameter is set to 2, provided the received signal has a baud rate of
200 or less, as the effective signal to noise ratio is thereby increased. Baud rate-settings:
2=200 Bd, 3=300 Bd, 4=400 Bd.
8.9.6 Deviation
Default setting: 400
Parameter: X 100... 1000, shift of the FM-FAX demodulator in Hz.
Sets the steepness (shift) of the FM-FAX demodulator. (NOTE: in JVFAX-mode, the
shift can be changed using special control bytes independently of the
Deviation
-
Parameter settings.) A
Deviation
value of 400 means that the demodulator will
process a frequency range from 1500 Hz to 2300 Hz, i.e. frequencies from 1900-400 Hz
to 1900+400 Hz.
8.9.7 MBaud
Default setting: 57600
Parameter: X 1200... 115200, baudrate during modem operation.
Sets the baud rate used by the serial interface during MODEM operation, i.e. whilst a
FAX, SSTV or FSK-Modem is active. For the optimum display of high resolution FAX
pictures, it is recommended that the rate is set to at least 57600, as long as the PC-
program in use will support that speed.
JVFAX supports up to 57600 baud. Additionally,
if at all possible, the baud rate should be a multiple of 19200, in order that the SSTV
synchronization processing works correctly.
8.9.8 HSynch
Default setting: 50
Parameter: X 10... 100, position of the sync pulse.
Sets the effective point in time where a recognized SSTV synchronization pulse, as such,
is inserted into the received data-stream. Small corrections to the positioning of the
picture edges can be made here by shifting the entire picture right or left. Normally, no
changes in the
HSynch
default setting is required.
8.9.9 JSynch
Default setting: 1
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