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MFJ-1278B MULTI-MODE BASIC OPERATION
AMTOR selective callsign in the "a_cmd:" MYSELCAL parameter. Furthermore, you must
have the appropriate sideband, usually, LSB selected because unlike PACTOR, AMTOR is
polarity dependent.
Amtor Detection in Pactor
The MFJ-1278B's Pactor continuously monitors the channel for Pactor packets, and for
AMTOR call packets that match your AMTOR SELCALL. When PACTOR hears your
AMTOR SELCALL, the TNC enters the "a_cmd:" AMTOR mode in an attempt to complete
the link. After entry into the AMTOR mode the MFJ-1278B will automatically return to
Pactor mode if the link is not established within 30 seconds. If the link is established, the
MFJ-1278B remains in AMTOR mode for the duration of the contact, and for an additional
30 seconds after the link terminates.
PACTOR STATUS INDICATORS.
While in the PACTOR mode of operation, you have PACTOR mode Status Indicators
avialable to you. These Status Indicators are comprised of the CON and STA leds. These leds
react in different ways according to what is happening. Below is a table as to how the leds will
act:
Status Indicator
STA CON Pactor Status
0 0 RX N/A
TX N/A
MON The TNC is idling and has not monitored
any information packets in the past
second.
0 1 RX Sending ack control signal
TX Last packet acknowledged
MON Received new packet
1 0 RX Dupe rcvd; sending Request control signal
TX Received request control
MON Received dupe packet
1 1 RX Info packet missing; sending request
TX Control sign missing; retransmitting
MON N/A