MFJ-495 Memory Keyer Instruction Manual
32 © 2001-2009 MFJ Enterprises, Inc.
key or a bug, connect the straight key or bug to the ground and the dash line. With the hand-
key option, both the dot and dash lines can be used to connect to a straight key. Notice hand-
key mode may not be used to enter messages or commands.
Note: In hand-key mode using the paddle, the MFJ-495 will not display the code sent or
record to the keyer memory. Also, the difference between this and the Hand-key
command is that this command affects the paddle only.
Q# Queue – enables (#=Y) or disables (#=N) the message queue, or toggles the message queue
on or off without the #. Queue mode enables the user to load messages into a buffer to play
sequentially. In queue mode, if you press a message button while a message is playing, that
message will play after the current message is done. When queue mode is off, pressing a
message button will abort any message being played and play the new message. When on, up
to 16 button presses are stored in order and acted upon in succession as each message is
completed.
To change Queue mode type “~Q” followed by “Y” for on, “N” for off, or ENTER to toggle.
The keyer will respond with “ON” or “OFF”. Press ESC or any other key to cancel and exit.
Note: Disabling the queue mode increases the message stack size to 24 levels deep used
by the embedded Call command.
R## Ratio – sets the speed ratio of the Speed control, where ## represents two digits in the range
of 02 to 20. The speed at the full clockwise position of the control is ## times that of the
speed at the full counter-clockwise position.
Press either the “–” or “+” (or “=”) to decrease or increase ratio, or enter up to two digits 02
to 20 to set the speed ratio. Press ENTER to accept and exit, or press ESC to cancel and exit.
S## Speed – sets the overall code speed to ## WPM, where ## represents two digits in the range
of 05 to 99. By "overall" speed, we mean the speed at which the words or groups are sent. A
"word" is defined as 50 units of time, and the word "PARIS" is exactly 50 units in length.
Therefore, if "PARIS" is sent 13 times in one minute, the sending speed is 13 wpm.
Standard Morse code timing defines a dit as one unit of time and a dah as three units of time.
Within each character, there is one unit between elements (dits and dahs). Three units
separate characters and seven units separate words. Farnsworth spacing (see above) will
increase the amount of time between characters and words. Note that setting the overall
speed greater than or equal to the Farnsworth speed will disable Farnsworth spacing.
Press either the “–” or “+” (or “=”) to decrease or increase speed, or enter up to two digits 05
to 99 to set the code speed. Press ENTER to accept and exit, or press ESC to accept and exit.
T## Tone – sets the sidetone frequency to approximately ##0 Hz, where ## represents two digits
in the range of 30 to 99. The MFJ-495 features smooth, clean audio, with sine wave output,
instead of the harsh square wave audio used by many other keyers. Also, the MFJ-495
produces each dit and dah with a rise and decay time of approximately 5 milliseconds,
avoiding the "spikes" that cause distracting key clicks. The MFJ-495's audio sounds like that
of a good CW transceiver.
Notice an alternating series of dots and dashes are sent to the sidetone monitor to assist in the
setting of the desired sidetone frequency. Press either the “–” or “+” (or “=”) to decrease or
increase tone frequency, or enter two digits 30 to 99 to set the tone frequency. Press ENTER
to accept and exit, or press ESC to cancel and exit.
U# User – selects the current user, where # represents the digit 1 to 4. User mode is provided to
support four operators with different configuration settings, such as speed, weight, etc. This
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