MFJ-495 Memory Keyer Instruction Manual
© 2001-2009 MFJ Enterprises, Inc. 31
keying is ended and when the PTT will de-assert. You may adjust this to your liking for on-
the-air sending.
Press either the “–” or “+” (or “=”) to decrease or increase the hang time, or enter up to four
digits 0001 to 9999 to set the hang time. Press ENTER to accept and exit, or press ESC to
cancel and exit.
K## Keying compensation – sets the keying compensation to ## millisecond, where ## represents
two digits in the range of 00 to 25. Some radios have a key delay of 5 ms or more. By
entering K05, the keyer will add 5 ms to the dots and dashes and subtract 5 ms from the intra-
character spaces. Although similar to increasing weight, this adjustment is independent of the
speed. This setting is used primarily to correct keying distortion by certain transceivers and
to eliminate the problems with a transmitter key delay.
Press either the “–” or “+” (or “=”) to decrease or increase compensation, or enter up to two
digits 00 to 25 to set the compensation time. Press ENTER to accept and exit, or press ESC
to cancel and exit.
L## Lag (keying delay) – sets the keying delay to ## millisecond, where ## represents two digits
in the range of 00 to 20. This setting is used primarily to accommodate switching delay in
certain station setup. It is used in conjunction with the PTT line to delay the keying output
until all the switching is finished; that is, the keying output is lagged behind the sidetone
audio and the PTT output. This controls the time between when PTT is asserted and when
CW keying will start.
Press either the “–” or “+” (or “=”) to decrease or increase delay, or enter up to two digits 00
to 20 to set the delay time. Press ENTER to accept and exit, or press ESC to cancel and exit.
M# Monitor – enables (#=Y) or disables (#=N) the sidetone monitor, or toggles the sidetone
monitor on or off without the #. If the sidetone is turned off, it will still play command
messages and status information. To conserve power, the keyer should be operated with the
monitor off in favor of the rig’s sidetone.
To change Monitor mode type “~M” 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.
N#### Number – sets the serial number. The serial number can be set from 0000 to 9999 (0000 will
be converted to 0001). Enter up to four digits to set the current serial number and press
ENTER to accept and exit, or press ESC to cancel and exit.
O# Output – enables (#=Y) or disables (#=N) the keying output, or toggles the keying output on
or off without the #. If the output is turned off, no signal goes to the Keying Output or the
PTT Output to allow practice operation. The output is temporarily disabled during memory
message storing, command mode operation, status information, and keyer setup.
To change Output mode type “~O” 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.
P# Paddle – selects paddle mode of automatic (#=A), semi-automatic (bug, #=S) or hand-key
(#=H) mode. With the automatic option, the keyer functions as an iambic keyer for use with
a dual-lever paddle. As an iambic keyer, the MFJ-495 has dot and dash memories for
"squeeze keying" and functions just like other iambic keyers, both standalone keyers and
those built into radios. With semi-auto, the keyer can be used with a single-lever key, with
dots generated automatically and dashes formed manually by the user. This emulates the
function of a mechanical semi-automatic "bug." You also may use this unit with a straight
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