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MFJ-1278B MULTI-MODE BASIC OPERATION
Examples are:
Amateur callsign is N2WX; Amtor MYSELCAL is NNWX
Amateur callsign is WB2SPE; Amtor MYSELCAL is WSPE
AMTOR depends on everyone having a unique selective call. If you find there is already a
station using the same call that you would use then you may need to base your ID upon the
call district that you're in. Select a letter based upon the table below:
1=Q 2=W 3=E 4=R 5=T 6=Y 7=U 8=I 9=O 0=P
Example:
N2WX becomes NWWX (using zone 2)
When MYSELCALL is set the MFJ-1278B is ready to receive and respond to AMTOR
calls.
Operating Mode A
To start the ARQ call, type "ARQ <selcall>" and <ENTER>. The <selcall> must be four
characters long. Both the CON and STA leds on the MFJ-1278B will light, and your
transmitter will start keying on and off repetitively. If the other station responds, you can
start sending data or you can abort the call by typing QRT or R.
When the CON lights a link is established. You may now type CONVERSE or K to enter
the data mode and start transmitting data. The CON and STA will be turning on and off at
various times depending on how much data you transmit and how good the link is.
When you are through transmitting, always use the AMTOR ending signal "+?". NEVER
use a "K" since this will not relinquish the ISS function and the station you're working will be
unable to transmit until the information sender sends a "+?".
If you wish to end the contact, go back to AMTOR command mode with a CTRL-C and type
"QRT".
While you are the current receiving station, you can't send any new data to the other station.
Should you wish to break in for some reason before the other station sends "+?", and you
want to become the transmitter, go to AMTOR command mode with CTRL-C and type
CHANGE. This forces the remote ISS to revert to the IRS. Then you can start transmitting
data.
If the CPU oscillator of the MFJ-1278B is improperly set, then you may experience a phasing
problem or a loss of sync, during ARQ operations. The CPU oscillator is factory set at
4.91520 MHz. If the oscillator frequency needs adjustment, then remove the cover of the