MFJ-1224 Instruction Manual
RTTY/CW Computer Interface
2
RTTT/CW This switch selects either the RTTY or CW mode of operation.
Shift The next two switches control the shift for RTTY.
In this position the interface is set for a 850Hz audio shift.
In this position the interface is set for a 170Hz audio shift.
In this position the interface is set for a 425Hz shift and 170Hz sending
shift
In this position the interface is set for a 425Hz shift and 850hz shift.
NORMAL/REVERSE This switch inverts the demodulated RTTY signal being sent to
the computer.
BACK PANEL
The MFJ-1224 provides inputs and outputs to allow interfacing to nearly any possible
combination of computer and transceiver. The back paragraphs below describe their
uses. Only a few of the available connections will be used for an given application;
however, the availability of a variety of signals greatly enhances the versatility of the
interface.
LOOP OUT The loop-out jack provides the ground return to drive loop type teletypes.
The user must connect the negative supply voltage to the sleeve. The center pin is a
