MFJ MFJ-492, MFJ-492X User Manual
The MFJ-492 Menu Driven Memory Keyer is a full featured keyer with an
easy to use menu driven interface. This unit has four soft sectored
message memories for a total of 192 characters. The MFJ-492X Menu
Driven Memory Keyer is the same keyer but has message memory expanded
to 8 separate 1000 character message memories, giving the unit the "X"
designation. The keyer can repeat messages continuously, insert timed
pauses within messages, insert an auto-incrementing serial number, and
have messages call other messages.
The MFJ-492 has adjustable controls for speed and volume on the front
of the unit. Also, the speed, weight, and sidetone frequency are
adjustable through menu selection or paddle command. Other modes such
as Hand Key, Semi-auto, Reverse Paddle, Iambic On/Off, Iambic A/B,
Queue, are accessed through menu selection or paddle command. The MFJ492 has both Direct and Grid-Block outputs and a port for an optional
remote control.
MFJ-492
Menu Driven Memory Keyer
FEATURES
Memories:
Four soft sectored message memories for a total of 192 characters
(MFJ-492) or eight memories of 1000 characters each (MFJ-492X).
Morse Code Trainer:
Random code generator with 5 character or random 1-8 character length words. Random
characters are selectable from alphabetic, numeric, or punctuation sets or specific 6 character sets.
Embedded Commands:
Auto-incrementing serial numbers, Timed pauses up to 99 minutes 99
seconds, Message loop, Linked messages, Message insertion.
Adjustable Parameters:
Code speed is variable from 5 to 100 WPM, weight varies from 5 to
95 %.
Parameter Save:
Message memory and keyer parameters saved in nonvolatile memory.
Sidetone Speaker:
Internal sidetone speaker with adjustable volume and frequency.
Output Tune Mode:
Constant key to tune tuners or antennas
Key Output Disable:
Enable and disable key output to practice operation.
Keying Modes
Iambic On/Off, Iambic A or Iambic B, Hand Key (straight key), Semi
Auto (bug), and Reverse Paddle modes are user selectable.
Positive or Negative Key Output:
Supports both positive and negative keyed radios.
Transmitter Compensation:
Adjustable key down delays to compensate for transmitter rise-time
delays.
CONNECTIONS
The MFJ-492 Menu Driven Memory Keyer requires a 12 VDC 250 milliamp
power supply. The power jack accepts a 2.1mm coaxial plug with the
center conductor positive. An optional DC supply, the MFJ-1312B, is
available from MFJ. Connect your MFJ-1312B Power Adapter or compatible
DC supply (coaxial line with shield ground) into the power jack on the
MFJ-492.
This unit supports both positive and negative keyed radios. Connect a
standard shielded RCA cable between your radio key input and to the
MFJ-492's
radios) or to the
radios with tube finals.)
Direct
output for positive keyed radios (most solid state
Grid-Block
output for negative keyed radios (most
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A paddle connects to the stereo phone jack with a shielded cable
through the back of the unit. Connect the dot wire of the paddle to
the ring on the plug and the dash wire to the center conductor. The
shield on the plug should be attached to the paddle ground.
The last port in the back of the unit is for the optional remote
control. The remote control gives you remote access to the keyer menu
if the main unit is out of reach. It is simply plugged into the
connector through the back plate.
BASIC OPERATION
The Menu Driven Memory Keyer is simple to operate. The push-button
marked
keyer will light the four LEDs sequentially and send the characters "O"
and "N" in Morse Code using the sidetone speaker. This tells you the
MFJ-492 is ready for operation.
Start sending with the paddle. Adjust the volume and speed to your
preference. If the speed is still too fast or too slow, adjust the
range of the speed knob using the Speed Set feature. See Menu
Operation.
Factory Reset
To reset the keyer to default settings, the
through power-up. This resets all settings to the factory default:
If the keyer is turned on in the normal mode (without the
down), then the keyer will retain all settings prior to power down.
controls power to the unit. After turning the unit on, the
PWR
key is held down
MENU
All memory messages are
cleared.
Weight set to 50% duty
cycle.
Iambic A mode selected. Queue mode off.
Break mode off. Output enabled.
Speed set to 20 WPM.
Sidetone frequency set to
2000 Hz.
MENU
key held
MENU OPERATION
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MENU DRIVEN
MEMORY KEYER
TM
The MFJ-492 menu system consists of a menu button marked
function buttons marked
the
key click and light the Menu LED of the new level. The row of boxes
beside that LED now contains the functions of keys
For example, to enable the Tune (key down) function, look for the box
marked Output Tune on the front panel. It is found on Row B under the
column F5. Press the
press the F5 key. The keyer will respond by entering the Tune mode.
Squeeze the paddles to exit that mode.
MFJ-492X Menu Operation
The MFJ-492X, a MFJ-492 with expansion RAM, works a little differently
than a normal unit. On a MFJ-492X, Menu A has a LED that is lit either
red or green. The red LED indicates the normal compliment of memories
( 1-4 ). The green LED indicates that there is an extra bank of
memories ( 5-8 ) available. Memories are set or played the same way
and F5 remains Serial Number Decrement on both levels.
key changes the menu level. The keyer will sound an audible
MENU
F1-F5,
MENU
and four menu LEDs marked
F1-F5
key until the LED marked B lights up. Then
. Pressing
A-D
.
MENU
, five
Menu A
Message Memory
To play or save to a message memory, select Menu A. To save a message
to memory, press and hold the function key until the keyer plays "GO"
in Morse code. You may now key in the message of your choice. As you
pause after every word, the keyer will play a "W" over the sidetone
speaker to show that it is inserting a word break. If the keyer does
not recognize your code as a valid character, the keyer will play a
series of 8 dots and that character will not be saved. If you make a
mistake entering a word, you can back up over it by keying in 8
continuous dots. The keyer will erase the previous word, then play the
word before it (if any) to let you know where you stopped. At the end
of your message hit the memory function key again to end your message.
The keyer will respond by sending an end of message character (+). If
you try to save more characters than you have memory, the keyer will
automatically end your message, send you an end of message character
and lock any unused messages. To play a message, press and release a
function key quickly.
Embedded commands:
While in the save message mode you may use embedded commands for
special features. To use an embedded command simply store the two
character, embedded command code within your message.
/N Inserts a serial number into a message. All nines are sent as "N"
and zeros are sent as "T". A serial number is automatically
incremented each time it is sent. To decrement the serial number,
press the serial number Decrement menu button. A new serial
number can be saved by using the serial number store menu feature.
Example: YOU ARE CONTACT NR /N
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