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USER'S GUIDE
4.5.6.3
End the Mode B (FEC) Contact, Return to ARQ Standby
You can end the FEC contact in several different ways:
o Type
<CTRL-C>
R
The
your PK-232 to AMTOR Standby. You can be accessed by any distant station's trans-
mission of your SELCAL.
o Without returning to Command Mode, type
shut off your transmitter.
Your PK-232 switches to the Morse Mode, sends your call sign at the speed set by
MSPEED
o Without returning to Command Mode, type <CTRL-D> to stop transmission immedi-
atly.
Your PK-232 is now in AMTOR Standby, ready for SELCAL access by any distant sta-
tion. Your monitor is ready to display any FEC signals received on the channel.
4.5.7
Echo as Sent (EAS)
EAS has special significance in AMTOR Mode A (ARQ). If EAS is ON, no matter how fast
you type characters on our keyboard, you will see them echoed on your screen only after
the distant station, partner in the AMTOR link, has validated (Ack'd) your block of three
characters.
With EAS ON, the characters will appear on your screen or printer only as the distant sta-
tion acknowledges them, three at a time.
o
If the data scrolls across your monitor at a nice even rate, in rhythm with your typ-
ing speed, 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 too good.
o
If the characters stop appearing on your monitor, the link is failing or has failed.
NOTE:
4.5.8
AMTOR Switching-Time Considerations
For operation in AMTOR Mode A (ARQ), your transceiver or transmitter-receiver combina-
tion must be able to change between transmit and receive within 20 milliseconds. Most
semiconductor-based radios can easily meet this specification. Many older tube-type ra-
dios that use electromechanical relays operate very well in AMTOR Mode A (ARQ).
PK232UG Rev. B 9/86
to return to Command Mode. Then type
function stops the FEC transmission, turns off your transmitter and returns
, and then shuts off your transmitter.
To prevent the PK-232's internal buffer from overflowing, use this mode if
you transmitting long messages from a buffer or disk drive.
<CTRL-F>
4-15
OPERATING MODES
R
break the link.
to send your Morse ID and
68
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