MFJ-495 Memory Keyer Instruction Manual
26 © 2001-2009 MFJ Enterprises, Inc.
Press LEFT or DOWN to decrease or press RIGHT or UP to increase the 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 LEFT or DOWN to decrease or press RIGHT or UP to increase the code 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 five 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 LEFT or DOWN to decrease or press RIGHT
or UP to increase the 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
allows up to four operators to use the keyer without having to reconfigure all the settings for
each operator. It also supports four different configuration settings for different contest
exchanges.
Alternately, press ALT+F1 to select user 1, ALT+F2 for user 2, ALT+F3 for user 3, or
ALT+F4 for user 4.
V reVerse – reverses the sense of the dot and dash paddles. When using paddles, the MFJ-495
normally expects the dot paddle to be connected to the tip of the plug and the dash paddle to
be connected to the plug's ring. If your paddles are wired in the opposite manner, or you wish
to change between right and left-handed operators, you may reverse the paddles.
W#### Weight – sets the automatic code weighting between ## percent at the counter-clockwise
position and ## percent at the clockwise position of the Speed control, where each ##
represents two digits in the range of 25 to 75. Weighting varies linearly with the overall
speed (automatic weight). Set both ## to the same value for constant weight, where
weighting is independent of the overall speed.
Weight is the duty cycle of a continuous string of dots, where 50% for perfect code. A higher
weight produces a heavier sound and a lower weight causes characters to sound lighter.
Weight can be set to remain constant and independent of speed, or it can be set to vary with
the code speed.
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