MFJ-464 Instruction Manual CW Keyer/Reader
13
Character Space
The Character Space menu is used to increase the character space (normally three units) up to 12
units long. There are two numbers on line two of the display; the number enclosed within “[“
and “]” is the character spacing and the other number is the word spacing. Note the character
space is always at least four units shorter than the word space. So you might have to increase the
word spacing before adjusting the character space.
Word Space
The Word Space menu is used to increase the word space (normally seven units) up to 16 units
long. There are two numbers on line two of the display; the number enclosed within “[“ and “]”
is the word spacing and the other number is the character spacing. Note the word space is
always at least four units longer than the inter-character space.
Keying Compensation
The Keying Compensation menu is used to increase the keying on-time and decrease the keying
off-time up to 25 milliseconds (ms). Some radios have a key delay of 5 ms or more. By setting
5 milliseconds of compensation, 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.
Keying Delay
The Keying Delay menu is used to delay the keying output up to 20 milliseconds. 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.
PTT Hang Time
The PTT Hang Time menu is used to set the PTT hang time from 1 to 9999 milliseconds. This
controls the time between when CW keying is ended and when the PTT will de-assert. You may
adjust this to your liking for on-the-air sending. Press the “1” button and use the Set dial control
to change time in increments of 1 ms; press the “100” button and use the Set dial control to
change time in increments of 100 ms.
Note: If Keying Delay and PTT Hang Time are equal to zero, the PTT Output waveform will
be identical to the Keying Output waveform.
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