MFJ-495 Memory Keyer Instruction Manual
© 2001-2009 MFJ Enterprises, Inc. 11
During message playback, the third main menu
COM DEC CXT PXT will change to [A] [B] [C]
[D]
. Notice there is only one set of “[” and “]” that indicates the current memory bank. To change to
another memory bank during playback, press the corresponding function button.
Setup Menus
The setup menus allow you to set up how the MFJ-495 works and behaviors. There are 22 setup menus
arranged in a “wrap-around” structure. To access these setup menus, press and hold the Menu button for
two seconds. The setup menu that will display is the one that was last used. When finishing, press and
hold the Menu button for two seconds to go back to the main menus for normal operation. The LED will
blink to indicate that you are in the setup menus. The Keying Output and PTT Output are also disabled.
Within each setup menu:
• Press the Menu button briefly to view the next setup menu; press and hold the Menu button for two
seconds to exit the setup menu and go back to the main menu.
• Press the Next button to view the next setup menu; press the Previous button to view the previous
setup menu.
• Press the Up or Down button to change the setting for that setup menu.
Speed Ratio
The Speed Ratio menu is used to set the speed ratio of the Speed control in the range of 2:1 to 20:1. This
ratio is the speed at the full clockwise position to that at the full counter-clockwise position. With
minimum overall speed of 5 WPM, a ratio of 20:1 will cover the entire speed range of 5 to 99 WPM.
Default speed ratio is 3:1 making the Speed control less sensitive and easier to adjust the code speed.
Overall Speed
The Overall Speed menu allows you to set the code speed for the current position of the Speed control in
the range of 5 to 99 words per minute (WPM). There are three numbers on line two of the display. The
first number is the speed at the full counter-clockwise position of the Speed control; the second number
enclosed within “[” and “]” is the speed corresponding to the current position of the Speed control; and
the last number is the speed at the full clockwise position of the Speed control. You can also adjust the
Speed control to where you want it to match the speed shown on the display.
By "overall" speed, we mean the speed at which the words 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 below) 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.
Farnsworth
The Farnsworth menu allows you to disable or enable Farnsworth mode and set the Farnsworth speed
(character speed) in the range of 10 to 99 WPM. When Farnsworth mode is enabled, characters (dots,
dashes, and intra-character spaces) are sent at the Farnsworth speed, but the spacing between characters
and words is increased to produce a slower overall speed. This technique is useful for helping the novice
learn the sounds of the code characters and avoid the tendency of counting individual dots and dashes.
The Farnsworth speed is always higher than the overall speed. As a result, Farnsworth mode (if enabled)
is automatically disabled when the overall speed is changed to one that is greater than or equal to the
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