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Mode B (SELFEC) Operation
Receiving Mode B SELFEC
If you want to receive only messages specifically addressed to you, you can set up your KAM Plus
for Mode B SELFEC receive. To do this, set the AUTOSTRT command ON in your KAM Plus and
then enter the AMTOR Standby mode or the FEC mode as described above. Your KAM Plus will
now copy only Mode B SELFEC transmissions that include your SELCAL in the transmission.
Transmitting Mode B SELFEC
To transmit a Mode B SELFEC broadcast type FEC followed by the SELCAL to be transmitted and
press return. The KAM Plus keys your radio, the bargraph goes dark, and the red HF transmit LED
lights. The KAM Plus then sends the SELCAL you entered as the preamble to a transmission, fol-
lowed by any message you type on the keyboard. To return to the receive mode, type [Ctrl-C][E].
The KAM Plus unkeys the transmitter after all of the data has been transmitted and will now re-
ceive ANY FEC transmission. Should you desire to only receive SELFEC transmissions, you must
have AUTOSTRT ON in the KAM Plus.
When you are ready to transmit again, type [Ctrl-C][T]. The KAM Plus will again send the SELCAL
you entered previously and then your next message. The SELCAL will automatically transmit each
time you start a new transmission while in the SELFEC mode. To cancel SELFEC mode, you must
type the [Ctrl-C][X] directive to return to the Command mode.
Listen AMTOR Operation
To enter the Listen AMTOR mode, the KAM Plus must first be in the Command mode (cmd:). Type
LAMTOR and press return. This places the KAM Plus in a Monitor-Only Mode that will let you listen
to Mode A, Mode B, or SELFEC AMTOR transmissions. If you are monitoring a Mode A link between
two other stations, it is very possible that you will miss parts of the transmissions and possibly
print repeated information as the two connected stations are attempting to pass their information.
It is also possible that your KAM Plus will not be synchronized properly to the signals and must be
re-synchronized in order to print readable information. If you are receiving what appears to be ran-
dom garbage characters while monitoring Mode A AMTOR, you can force the KAM Plus to attempt
to re-synchronize by typing [Ctrl-C][R].
NOTE: You cannot transmit from the LAMTOR mode.
Notes on AMTOR Operation
You can set your KAM Plus to automatically send a CW ID during Mode A operation if desired. To
do this, set the text you want to send (up to 15 characters) with the CWIDTEXT command, set the
CWPTT command ON and set ARQID to the number of minutes between CW IDs. If you operate
AFSK (SSB) you must also set CWAUDIO ON. The CW ID speed is set by the CWSPEED command.
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