MFJ-1224 Instruction Manual
RTTY/CW Computer Interface
3
continuation of the negative supply. The loop out merely acts as a spst switch switching
the loop current on and off.
DIRECT KEYING This output keys rigs requiring direct keying (most rigs with solid
state finals).
GRID BLOCK KEYING This output keys rigs requiring grid block keying (most rigs
with tube finals).
KEY IN This input jack allows you to externally key the transmitter with your own
electronic keyer or keyboard.
DEMOD OUT The demodulated output provides a TTL level signal which corresponds
to the incoming RTTY space. It is also low for CW tone.
The next connector is a five pin jack, labeled K-connector because it is specifically
designed for use with KANTRONILCS software. From left to right the pins are as
follows:
DEMOD This pin produces the same output as the DEMOD OUT jack.
GROUND This pin provides the ground connections between the interface and the
computer.
CW KEY This input pin allows the computer to key the transmitter through the interface.
A low on this pin causes the interface to key the transmitter.
RTTY This input controls the AFSK for RTTY transmission. It works in conjunction
with CW ID signals and to operate the push-to-talk switch. This will be covered in detail
later.
CW ID This line controls the audio tone for CW identification. It works in conjunction
with the RTTY line to produced RTTY and CW ID signals and operate the push-to talk
switch. This will be covered in detail later.
