MFJ-422D/422DX Instruction Manual
Electronic Keyer Paddle
3
Connections
1. A nine volt battery (not included) may be installed. Remove the case by removing the screws
on the bottom that secure the paddle. A battery clip, located inside the case, is provided for in-
stalling a nine volt battery.
2. A 12 VDC power supply may also be used to power the MFJ-422D. A 2.1 mm coaxial plug with
a positive center and a negative sleeve should be used to power this unit. The MFJ-1312B, an
optional power adapter, is available from MFJ Enterprises, Inc. The battery is automatically dis-
connected when external power is used.
3. The keying circuit allows keying of grid-block and solid state transmitters. Keying output con-
nection is made with a quality standard shielded RCA cable between your radio key input and
the MFJ-422D's
Key Output
jack.
Note: Consult the transmitter's instruction manual to determine which output to use. When in
doubt, try both jumper positions. The transmitter will continuously or not at all when the jump-
ers are connected to the wrong position.
Keyer Operation
1. A nine volt battery or an optional power adapter may be used to supply power to the keyer.
2. The keyer should be turned on by pressing the
Power
button and the LED is lit.
3. The
Semi-Auto/Auto
button should be in the "out" position for automatic operation.
4. The user should now start sending with the paddle and adjust volume, tone, weight, and
speed to his or her preference.
5. The dot and dash memories make sending easier. The memories allow the user to key a dot
before the completion of a dash and vice versa. This feature can be checked by setting the
keyer to the lowest speed and tapping first the dash lever and then the dot lever before the
completion of the dash. the keyer will provide both the dash and the dot. The dash memory
can be checked in a similar manner. The dot insertion feature allows the user to insert a dot by
tapping the dot lever while holding the dash lever in. The dash insertion feature allows the
user to insert a dash while holding the dot lever in. The Iambic operation feature allows send-
ing of alternate dots and dashes when both paddles are squeezed. The first paddle contacted
will determine whether a dot or dash first.
6. The user may select either
Iambic A
or
B
according to his or her preference.