Kantronics KPC-4 - Page 58

Tuning AMTOR
AMTOR signals are very similar to RTTY signals, in that they are transmitted with
MARK and SPACE tones, and therefore the bargraph indicator will light both ends of
the bargraph when properly tuned in. If the station you are tuning is in Mode A, the
bargraph will seem to flash on and off as the stations alternately transmits and then
receives. Once a station is properly tuned, the LOCK and VAL lights on the KAM will
light. Once you have this LOCK conditions, the KAM will start sending data to your
terminal. The VAL light may go out at times, indicating that invalid characters have
been received. If you have the station tuned properly, but nothing prints on your
screen, you should try the invert function by using the Ctrl-C I directive. You can
change the shift being used by using the Ctrl-C S directive, which will cycle through
the available shifts. Most AMTOR is sent with a standard 170 Hertz shift.
Summary of AMTOR Directives
Ctrl-C E Return to receive mode when transmit buffer is empty
Ctrl-CI Invert received MARK/SPACE signals
Ctrl-C R Return to receive mode immediately
Ctrl-C S Select next MARK/SPACE shift
Ctrl-C T Enter transmit mode — seize ISS status
Ctrl-C X Exit AMTOR Mode back to Command Mode (Packet)
Ctrl-W Send who are you sequence
Aug. 13, 1990 © Copyright 1989, 1990, Kantronics, Inc. All Rights Reserved.
Version 3.0 Duplication of this manual or the firmware without
Operations Manual permission of Kantronics, Inc. is prohibited.