Chapter 4 - Operation
28
AMTOR OPERATION
The primary commands which affect AMTOR Operation are
MYSelcall
and
TXDAmtor
. These
entries should be checked prior to selecting an AMTOR mode. Refer to the commands section of
the manual for these if you have not already made the appropriate entries.
The following commands are used to select the type of AMTOR signal you will receive or trans-
mit:
AMtor
- This command places the unit in AMTOR Mode. With this entry you will be able to
transmit or receive mode B (FEC) signals or receive mode A (ARQ) signals which contain your SEL-
CAL. If you receive an ARQ signal containing your SELCALL, your transmitter will be keyed and
slaving to the calling Station will occur. If you wish to initiate an ARQ call, enter
AMtor
followed by
a space and the SELCALL of the Station you want to call.
Lamtor
- This command places the unit in listen AMTOR mode. Mode A (ARQ) and Mode B
(FEC) signals will be received. No transmissions will take place in Lamtor. If you monitor an ARQ
slaving call which includes your SELCALL you must revert to AMTOR mode to conduct Communica-
tions,
FEC
- This command places the unit in mode B for either transmission or reception. Entry of
FEC
followed by a SELCALL will cause the unit to make a selective mode B call. See also the
AU-
TOstart
command in the command section.
CALLING CQ: Since Mode A (ARQ) is a one on one "hand-shaking" mode it should not be used
for general calling to CQ. At the
cmd:
prompt enter
AMTOR
<
CR
>. You are now in the AMTOR
standby mode. Next enter a
CTRL-C
followed by the letter
T
. REMEMBER to use no spaces be-
tween these commands. At this time you will be sending in mode B and you should see your trans-
mitter key and the LED bargraph dark. After allowing the transmitter to send "idle" characters for a
few seconds, type a general 3×3 CQ just as you would in CW Operation. At the end of the CQ you
should announce your SELCALL prior to reverting to receive. To return to receive you enter a
CTRL-C
followed by the letter
R
. If someone wants to talk to you, he will call you using mode A.
When the conversation is over and the other Station ends the link, you will return to the standby
mode.
CALLING IN MODE A (ARQ): If you wish to call a Station in this mode you MUST know his SEL-
CALL. At the
cmd:
prompt enter
AMtor
followed by a space and the four letter SELCALL required.
When you enter a
carriage return
, the unit will begin sending phasing signals containing the called
stations SELCALL. If he is available you will hear his responses and observe illumination of the lock
and valid LEDs on the KAM. Once lock occurs and the link is validated, you can begin exchanging
Information.
Once connected as a Mode A (ARQ) Master you will be the Information sending Station. While
exchanging communication with the other station you may reverse the data flow by ending each
transmission with the figures plus question-mark. changeover signal (
+?
). If you wish to "seize"
the link and become the sending station during a period the distant station is sending to you, en-
ter a
CTRL-C
followed by a letter
T.
To terminate the link and send the termination sequence, enter
a
CTRL-C
followed by the letter
X
. This command will cause termination of the link and return to
the
cmd:
prompt /Command Mode) on your display.
You can always return to the Command Mode by typing
CTRL-C
followed by
X
.