MFJ MFJ-422DX User manual

MFJ-422D/422DX Instruction Manual Electronic Keyer Paddle
MFJ-422D
ELECTRONIC KEYER PADDLE

MFJ-422D/422DX Instruction Manual Electronic Keyer Paddle
1
Introduction
The MFJ-422D Electronic Keyer Paddle is an iam ic keyer and paddle com ination. The MFJ-422DX
keyer installs on your MFJ-564 or Bencher type paddle. Both are microprocessor controlled keyers
that provide iam ic key operation and dot-and-dash memory to make sending perfect code easier.
It has tunea le code speed, code weight, and sidetone frequency; it supports oth direct and grid-
lock keying outputs. You also get a choose etween Iam ic Type "A" and Type "B" keying.
Note: All references to the MFJ-422D apply to the MFJ-422DX, unless otherwise stated.
Control Functions
1. The Power utton turns the unit ON and OFF. The power is ON when the utton is locked in
the "in" position and the LED is lit and OFF in the "out" position.
2. The Semi-Auto/Auto utton allows semi-automatic " ug" and manual operations. The keyer
generates dots automatically when a squeeze or single lever 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 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 fac-
tory 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 e 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 e off when changing the jumper settings.
4. The Volume control, located on the left side of the unit, adjusts the sidetone level of the inter-
nal speaker. Turn the control clockwise to increase the volume and counter-clockwise to de-
crease the volume.
5. The Weight control varies the code weight from approximately 25 % to 75 %, with the stand-
ard dot defined as 50 % weight. The standard dot-dash-space ratio is 1:3:1 (trimpot at mid-
range). This control is accessed through a small hole on the rear of the unit and may e ad-
justed using a small flat-headed screwdriver. This control is turned clockwise to increase dot
and dash lengths and counter-clockwise to decrease dot and dash lengths.
6. The Tone control sets the desired sidetone pitch from approximately 300 to 1200 Hz. This con-
trol is also accessed through a small hole on the rear of the unit and may e adjusted using a
small flat-headed screwdriver. This control is turned clockwise to raise the pitch and counter-
clockwise to lower the pitch.
7. The Key Output circuit supports oth positive and negative keyed radios. The MFJ-422D can
only key one type of transmitter at a time. This is an internal jumper selected option. The unit
is factory set to direct keying (most solid state radios). To change to grid- lock keying (most
radios with tu e finals) the power must e off, then remove the paddle to access the jumpers
inside the case. Locate jumpers JMP1 and JMP2. JMP2 is directly ehind the RCA jack (J2).
JMP1 is located ehind the power jack (J1). Set oth jumpers JMP1 and JMP2 to the "G" posi-
tion. To key a solid state transmitter, set oth jumpers to the "D" position.
Note: Power must e off when changing the jumper settings.

MFJ-422D/422DX Instruction Manual Electronic Keyer Paddle
2
8. The Iam ic Type A/B mode is also set inside the unit with a jumper. The unit is factory set
for Type "A" Iam ic. If you prefer Type "B" Iam ic, remove the paddle to access the jumper.
Locate jumper JMP3 ehind the power jack (J1), etween JMP1 and JMP8; set it to the "B" po-
sition. For Type "A" Iam ic, set the jumper to the "A" position.
Note: Power must e off when changing the jumper settings.
When a squeeze is released during an element (dot or dash), type "B" adds the opposite ele-
ment. Type "A" just finishes the element in progress and does not produce a following alter-
nate element. For example, in Type "A" Iam ic, a squeeze release during the "dah" in the letter
A will produce "dit dah" (A). In the Type "B" Iam ic, a squeeze release during the "dah" in the
letter A will produce "dit dah dit" (R).
Paddle Installation for the MFJ-422DX
If you purchased the MFJ-422DX (keyer without paddle), you must install it onto your paddle. Fol-
low these instructions for installing the MFJ-422DX onto a MFJ-564 or Bencher type paddle:
1. Remove any ca les from the paddle. Do not apply power to unit while it is disassem led.
2. Set up your MFJ-422DX now, using the four internal jumpers, to the type of output keying re-
quired, the desired Ima ic mode, and the speed range. Refer to items 3, 7 and 8 of the pre-
vious section for locations and meanings of these jumpers; also, refer to the "Jumper Settings"
section on page 3 for the meanings of these jumpers.
3. If you wish to use a nine volt attery, install one now. A nine volt attery fits in the attery clip
located inside the case. MFJ suggests the use of a good long-life alkaline attery for longest
operation.
4. Remove the ru er foot from the ottom rear of the paddle.
5. Remove the plastic ca le clamp from the ottom center of the paddle.
6. Slide the MFJ-422DX on the ack of the paddle. Thread the ca le through the slot on the ot-
tom of the MFJ-422DX. Secure the case with the ru er foot and new screws. The MFJ-564
Iam ic Paddle has four additional holes to etter secure the case of the paddle.
7. Connect the BARE wire of the ca le to the middle terminal on the ottom of the paddle for
GROUND.
8. If you normally operate the paddle right-handed , then connect the DOT (white or clear col-
ored) wire to the left paddle terminal and the DASH ( lack) wire to the right terminal. Connect
the wires the opposite way if you operate the paddle left-handed .
9. Place the ca le in the plastic ca le clamp and secure it with a screw. Fold any excess ca le into
the unit.

MFJ-422D/422DX Instruction Manual Electronic Keyer Paddle
3
Connections
1. A nine volt attery (not included) may e installed. Remove the case y removing the screws
on the ottom that secure the paddle. A attery clip, located inside the case, is provided for in-
stalling a nine volt attery.
2. A 12 VDC power supply may also e used to power the MFJ-422D. A 2.1 mm coaxial plug with
a positive center and a negative sleeve should e used to power this unit. The MFJ-1312B, an
optional power adapter, is availa le from MFJ Enterprises, Inc. The attery is automatically dis-
connected when external power is used.
3. The keying circuit allows keying of grid- lock and solid state transmitters. Keying output con-
nection is made with a quality standard shielded RCA ca le etween 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
dou t, try oth 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 attery or an optional power adapter may e used to supply power to the keyer.
2. The keyer should e turned on y pressing the Power utton and the LED is lit.
3. The Semi-Auto/Auto utton should e 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
efore the completion of a dash and vice versa. This feature can e checked y setting the
keyer to the lowest speed and tapping first the dash lever and then the dot lever efore the
completion of the dash. the keyer will provide oth the dash and the dot. The dash memory
can e checked in a similar manner. The dot insertion feature allows the user to insert a dot y
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 Iam ic operation feature allows send-
ing of alternate dots and dashes when oth paddles are squeezed. The first paddle contacted
will determine whether a dot or dash first.
6. The user may select either Iam ic A or B according to his or her preference.

MFJ-422D/422DX Instruction Manual Electronic Keyer Paddle
4
Morse Code Character Set
1
A di-dah ·- N dah-dit -·
B dah-di-di-dit -··· O dah-dah-dah ---
C dah-di-dah-dit -·-· P di-dah-dah-dit ·--·
D dah-di-dit -·· Q dah-dah-di-dah --·-
E dit ·R di-dah-dit ·-·
F di-di-dah-dit ··-· S di-di-dit ···
G dah-dah-dit --· T dah -
H di-di-di-dit ···· U di-di-dah ··-
I di-dit ·· V di-di-di-dah ···-
J di-dah-dah-dah ·--- W di-dah-dah ·--
K dah-di-dah -·- X dah-di-di-dah -··-
L di-dah-di-dit ·-·· Y dah-di-dah-dah -·--
M dah-dah -- Z dah-dah-di-dit --··
1 di-dah-dah-dah-dah ·---- 6 dah-di-di-di-dit -····
2 di-di-dah-dah-dah ··--- 7 dah-dah-di-di-dit --···
3 di-di-di-dah-dah ···-- 8 dah-dah-dah-di-dit ---··
4 di-di-di-di-dah ····- 9 dah-dah-dah-dah-dit ----·
5 di-di-di-di-dit ····· 0 dah-dah-dah-dah-dah -----
Period [.] di-dah-di-dah-di-dah ·-·-·- AAA
Comma [,] dah-dah-di-di-dah-dah --··-- MIM
Question Mark or Request for Repetition [?] di-di-dah-dah-di-dit ··--·· IMI
Fraction Bar or Slash Bar [/] dah-di-di-dah-dit -··-· DN
End of Message, Plus Sign, or Cross [+] di-dah-di-dah-dit ·-·-· AR
End of Work di-di-di-dah-di-dah ···-·- SK
Dou le Dash, Equal Sign, Pause, or Break [=] dah-di-di-di-dah -···- BT
Semicolon [;] dah-di-dah-di-dah-dit -·-·-· KR
Colon [:] dah-dah-dah-di-di-dit ---··· OS
Apostrophe ['] di-dah-dah-dah-dah-dit ·----· WG
Quotation Mark ["] di-dah-di-di-dah-dit ·-··-· AF
Hyphen or Dash [-] dah-di-di-di-di-dah -····- DU
Underline [_] di-di-dah-dah-di-dah ··--·- IQ
Dollar Sign [$] di-di-di-dah-di-di-dah ···-··- SX
Left Parenthesis or Go Only [(] dah-di-dah-dah-dit -·--· KN
Right Parenthesis [)] dah-di-dah-dah-di-dah -·--·- KK
Wait or Stand By di-dah-di-di-dit ·-··· AS
Understood di-di-di-dah-dit ···-· SN
Starting Signal dah-di-dah-di-dah -·-·- KA
Error di-di-di-di-di-di-di-dit ········ HH
Paragraph [¶] di-dah-di-dah-di-dit ·-·-·· AL
Invitation to Transmit or Go Ahead [K] dah-di-dah -·- K
1
FCC test requirement consists the 26 letters, the 10 numerals, the period, the comma, the question mark,
AR, SK, BT and fraction ar DN.

MFJ-422D/422DX Instruction Manual Electronic Keyer Paddle
5
Signals used in other Radio Services
Interrogatory di-di-dah-di-dah ··-·- INT
Emergency Silence di-di-di-di-dah-dah ····-- HM
Executive Follows di-di-dah-di-di-dah ··-··- IX
Break-in Signal dah-dah-dah-dah-dah ----- TTTTT
Emergency Signal di-di-di-dah-dah-dah-di-di-dit ···---··· SOS
Relay of Distress dah-di-di-dah-di-di-dah-di-dit -··-··-·· DDD
Jumper Settings
JMP1 JMP2 Key Mode
D D Direct *
D G Invalid
G D Invalid
G G Grid Block
JMP3 Iam ic Mode
A A *
B B
JMP9 Speed Range
L 5 - 65 WPM *
H 10 - 40 WPM
* Factory defaults.

MFJ-422D/422DX Instruction Manual Electronic Keyer Paddle
6
SCHEMATIC