MFJ Menu Driven Memory Keyer -492 Instruction Manual page 2

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, lambic A or lambic 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 Direct output for positive keyed radios (most solid
state radios) or to the Grid-Block output for negative keyed radios (most radios with tube finals.)
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.
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