PK-232 MBX Operating Manual - N3UJJ

PK-232 OPERATING MANUAL
Pactor OPERATION
11.7.7 Operating on the Wrong Sideband
Pactor, like packet, is mark-space polarity independent although the
reason for this is somewhat different. specific header blocks define
the mark-space sense for each Pactor information block and during
linked operation, the mark-space sense is alternated. For this reason,
there Is no "wrong" sideband. You may operate on either LSB or USB.
If you are going to change to other modes, for example AMTOR, then LSB
must be used. It is suggested that LSB be used to make mods changes
simple as well as keeping the radio dial frequency reading consistent
with other users.
If you are using a radio that has direct PSK inputs, keep in mind that
Pactor uses 200 Hz shift and most direct FSK capable radios are set for
170 Hz shift. If the 170 Hz shift can not be adjusted to 200 Hz, use
the TX audio from the PK-232 to drive the microphone input when
operating Pactor.
11.7.8 Little Used Pactor Commands
There are four seldom-used Pactor commands that are accessible with the
UCmd command. This command is of the form UCmd n x, where "n" is the
UCind number and x is the setting. See Appendix A for more
information.
The Pactor UCMD commands are:
UCMD 0:
UCMD 1:
UCMD 2:
UCMD 3:
Default 3, maximum 30. This command sets the number of
correct packets in a row that must be received
before generating an automatic request to
change from 100 to 200 baud. Also see the
command PT200 in 11.7.4.
Default 6, maximum 30. This command sets the number of
incorrect packets in a row that must be
received before generating an automatic
request to change from 200 to 100 baud. Also
see the command PT200 in 11.7.4.
Default 2, maximum 9. This command sets the number of
packets sent in a baud rate speed-up attempt.
Default 5, maximum 120. This command sets the maximum
number of Memory ARQ packets that are combined
to form one good packet. When this number is
exceeded, all stored packets are erased and
Memory ARQ is re-initialized.
11.8 Monitoring ARQ Pactor Contacts with PTLIST
Use the "PTLIST" command to monitor ARQ traffic flowing between two
stations linked in a Pactor ARQ contact. Your PK-232 will try to
synchronize with whichever of the two linked ARQ stations is the
Information Sending Station at the moment.
2/93 11-10
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