MFJ-422E/422EX Instruction Manual
Electronic Keyer Paddle
1
Introduction
The MFJ-422E
Electronic Keyer Paddle with Memory
is an iambic keyer and
paddle combination. The MFJ-422EX keyer installs on your MFJ-564 or
Bencher type paddle. Both are microprocessor controlled keyers that provide
iambic key operation and dot-and-dash memory to make sending perfect code
easier. It has tunable code speed, code weight, and sidetone frequency; it
supports both direct and grid-block keying outputs. You also get to choose
between Iambic Type "A" and Type "B" keying. It even has a non-volatile
memory to record and play a message of your choice.
Note: All references to the MFJ-422E apply to the MFJ-422EX, unless
otherwise stated.
Control Functions
1.
The
Power
button turns the unit ON and OFF. The power is ON when the
button is locked in the "in" position and the LED is lit and OFF in the "out"
position.
2.
The
Semi-Auto/Auto
button allows semi-automatic "bug" and manual
operations. The keyer generates dots automatically when a squeeze or
single lever key is used. Dashes are manually made. The keyer is
completely manual when a straight key is used. Semi-Auto is active when
the switch is in the "in" position and Auto when in the "out" position.
3. The
Message
button lets you record and play a message from the non-
volatile memory. It is a momentary push-button that is time sensitive.
4.
The
Speed
control, located on the left side of the unit, varies the code
speed. The speed range is configured with an internal jumper (JMP9) for 5
to 65 WPM or 10 to 40 WPM. Turn the control clockwise to increase
speed and counter-clockwise to decrease speed. The unit is factory set to 5
to 65 WPM. To make the speed adjustment less sensitive, change the speed
range to the narrower range of 10 to 40 WPM. To change the speed range
the power must be off, then remove the paddle to access the jumper inside
the case. Locate jumper JMP9 next to the microprocessor and set it to the
"H" position.
Note: Power must be off when changing the jumper settings.