Timewave PK-232MBX, Руководство по эксплуатации

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PK-232 MBX – OPERATING MANUAL PACTOR OPERATION
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11.7.4
Automatic Speed Change
If the command PT200 is set on, the linked Pactor mode will automatically change the
transmitted data rate from 100 bps to 200 bps if a certain number of error-free 100 bps
packets are received in a row. If the error rate at 200 bps is excessive, the data rate will
automatically revert to 100 bps. There may be some propagation conditions that will
cause the system to vacillate between the two data rates. This may be prevented by set-
ting PT200 to OFF, which will force 100 bps operation.
11.7.5 Echoing Transmitted Characters As Sent (EAS)
EAS (Echo As Sent) operates the same as in AltQ AMTOR. If EAS is ON, you will see char-
acters echoed to your screen only the first time your PK-232 sends them. If the data is
not acknowledged by the receiving station and is re-transmitted, the characters are not
echoed again. With EAS OFF, characters are echoed to you screen as you type them. With
EAS ON:
o If the data scrolls across your monitor at an even rate, you can assume that you
have a good ARQ link.
o If the data hesitates or scrolls in "jerky" intermittent fashion, that's generally a sign
that the radio link is not very good.
o If the characters stop appearing on your monitor, the link is failing or has failed. The
STATUS display will tell you this by showing ERROR or REQUEST nearly continu-
ously.
11.7.6 Sending only Complete Words (WORDOUT)
Some Pactor users like to have their words sent out only when they are complete. This al-
lows the word you are currently typing to be edited as long as you have not typed a
<Space> character or punctuation. Turning WORDOUT ON activates this feature. See the
Command Summary for more information.
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 in-
put when operating Pactor.
11.7.8 Little Used Pactor Commands
There are four seldom-used Pactor commands that are accessible with the UCmd com-
mand. 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.