MFJ-495 Memory Keyer
Instruction Manual
18
©
2001-2009 MFJ Enterprises, Inc.
audio and the PTT output. This controls the time between when PTT is asserted and when
CW keying will start.
M#
M
onitor – enables (#=Y) or disables (#=N) the sidetone monitor, or toggles the sidetone
monitor on or off without keying 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.
N####
N
umber – sets the serial number. You must enter four numbers, most significant digit first.
All numbers must be in the proper Morse code format. For example, the number "1" must be
"di-dah-dah-dah-dah" and the number "0" must be "dah-dah-dah-dah-dah". The serial
number can be set from 0000 to 9999 (0000 will be converted to 0001).
O#
O
utput – enables (#=Y) or disables (#=N) the keying output, or toggles the keying output on
or off without keying 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.
P#
P
addle – 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 option, 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 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#
Q
ueue – enables (#=Y) or disables (#=N) the message queue, or toggles the message queue
on or off without keying in #. 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.
Note:
Disabling the queue mode increases the message stack size to 24 levels deep used
by the embedded Call command.
R##
R
atio – 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.
S##
S
peed – 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
