AMTOR
46
empty, allowing you to respond to an ARQ call answering your CQ. For instance, to enter AMTOR
and call CQ, the sequence would be:
cmd:AMTOR
Ctrl-C T
CQ CQ CQ de WK5, WK5M WK5M SELCAL WWKM WWKM WWKM
CQ CQ CQ de WK5, WK5M WK5M SELCAL WWKM WWKM WWKM
CQ CQ CQ de WK5, WK5M WK5M SELCAL WWKM WWKM WWKM
Ctrl-C E
If you then receive a call, your transmitter would begin responding automatically to the call and
you would be the Slave station (since you did not initiate the link). If the station linked to you
using the CCIR 625 format, you will receive a message indicating his selcal. The station that called
you is called the Master and is automatically the Information Sending Station (ISS). Any data he
types will appear on your screen, and the TNCs handle request for transmission of incorrectly re-
ceived data automatically. When he is ready to have you transmit data to him, he would enter the
changeover sequence, which consists of a FIGURES shift, +?. You then become the ISS and the
other station is the Information Receiving Station (IRS). You now type your message to the other
station and when you are finished and want him to respond, you send the changeover sequence.
Since the KAM automatically inserts the FIGURES shift for you, all you need to type is the +? to
perform the changeover.
While you are the IRS, it many at times be necessary to "seize" the link from the other station and
become the ISS. In order to do this, while receiving, use the Ctrl-C T directive. This will send a
special sequence to the other station and cause a changeover to occur.
The KAM also supports the WRU (Who aRe yoU) function. This function causes the other station to
send a pre-defined string indicating information about his station. In the KAM, this information is
entered with the WTEXT command. To initiate the WRU function, use the Ctrl-W directive while
you are the ISS and then the remote station will send his information to you if his TNC also sup-
ports this function.
After you've finished your conversation with the other station, you may return to the Command
Mode (cmd:) by issuing the Ctrl-C X directive. This will terminate the link and return you to Packet
Mode operation.
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 prop-
erly tuned in. If the station you are tuning is in Mode A, the bargraph will seem to flash on and off
as the station 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 send-
ing 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.
To Next Page
Loading...
