MFJ-441 Instruction Manual
SlimLine Econo Keyer
3
Keyer Operation
1. A 9-volt battery or an optional dc adapter may be used to supply power to the keyer.
2. The key paddle should be connected to the Key jack on the rear panel of the unit. A dual pad-
dle squeeze key or a single lever key can be used.
3. Next, the keyer should be turned on with the Power switch.
4. The Semi-Auto/Auto switch should be in the "out" position for automatic operation.
5. The user should now start sending with the paddle and adjust volume, tone, weight, and
speed to his or her preference.
6. 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 allows sending of al-
ternate dots and dashes when using squeeze key and with both paddles squeezed. The first
paddle contacted will determine whether a dot or dash occurs first.
7. The user may select either Iambic A or B according to his preference.
Message Memory
The Message button is used to record and play your message. To record the message, press and
hold the Message button until the keyer plays "GO" (dah-dah-dit dah-dah-dah) in Morse code and
the LED flashes. You may now key in the message of your choice. As you pause after every word,
the keyer will play a "W" (di-dah-dah) over the sidetone speaker to show that it is inserting a word
break (uses one unit of memory). If you make a mistake entering a word, you can back up over it
by briefly pressing and releasing the Message button. The keyer will erase the last word, then play
the word before it (if any) to let you know where you stopped. If deleting the first word of the
message, the keyer will play "GO" instead. At the end of your message, press and hold the Mes-
sage button until the keyer sends an end of message character "+" (di-dah-di-dah-dit) and the
LED stops flashing. When there are ten or less units of memory remaining, the LED will flash faster
to let you know the memory is running low. If you try to save more characters than you have
memory, the keyer will automatically end your message and send you an end of message charac-
ter. The speed, weight and tone cannot be changed during message recording. Also, the output
keying circuit is disabled during recording.
Note: A straight or manual key cannot be used to record the message.
To play the recorded message, momentarily press the Message button. Ongoing message can be
stopped by tapping either paddle or pressing the Message button. The memory is set up for only
one message and it is volatile; that is, when power is removed the message is erased. There are
85 units of memory, which can record up to 85 characters (nine elements maximum per character
- an element is a dot or a dash). Each normal character uses one unit of memory; only the rarely
used 7-, 8- and 9-element characters require two units of memory.
