PK-232 MBX Operating Manual - N3UJJ

PK-232 OPERATING MANUAL
COMMAND SUMMARY
RFRame ON/OFF
Default: OFF
Mode: Baudot and ASCII RTTY Host: RG
Parameters:
ON Check received Baudot and ASCII characters for framing errors.
OFF Print received Baudot and ASCII characters regardless of errors.
When RFRAME is OFF (default), Baudot and ASCII modes operate as always, that is
characters are copied based on the presence of the DCD signal.
When RFRAME is ON, the PK-232 checks received Baudot and ASCII characters for
framing errors. A framing error on a character in an asynchronous mode (such as
Baudot and ASCII) occurs when the bit in the stop position is detected to be the
wrong polarity (the polarity of the start bit is supposed to be space or 0, while
the stop bit is supposed to be mark or 1). The unit stops copying characters
when 4 out of the last 12 characters had framing errors. Copy resumes when the
most recent 12 characters are error-free. This should significantly reduce the
copying of garbage characters when no signals are present. When RFRAME is ON,
characters are copied based on the recent history of framing errors.
RXRev ON/OFF Default: OFF
Mode: Baudot and ASCII RTTY/AMTOR Host: RX
Parameters:
ON — Received data polarity is reversed (mark-space reversal).
OFF — Received data polarity is normal.
Use the RXREV Command to invert the polarity of the data demodulated from the
received mark and space tones.
In some cases, you may be trying to copy a station that's transmitting "upside
down" although it is receiving your signals correctly. This is especially true
when listening to signals in the Short Wave bands. Set RXREV ON to reverse the
data sense of received signals.
RXREV operates only at RBAUD and ABAUD speeds up to 150 baud.
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