MFJ-464 Instruction Manual CW Keyer/Reader
21
When typing speed is greater than the code speed, characters will begin to fill a type-ahead
buffer. The code sent to the radio and over the sidetone speaker will lag behind the typing of
each character. Most of the time this will not cause a problem. Only for very fast typists that
send slow code will the type ahead buffer fill significantly. The maximum size of the type-ahead
buffer is 190 characters. When the buffer fills to 180 characters, the sidetone will be higher.
This is a signal to slow typing speed because when the buffer fills to 190 characters each new
key-press will be lost. It is best to never type much faster than your code speed.
Transmitted characters and buffer memory may be monitored using the LCD display on the
MFJ-464. This readout is comprised of two lines of text, each containing 16 characters. The top
line shows the characters currently being transmitted. The bottom line normally shows the
received characters. The bottom line can show the content of the type-ahead buffer memory; this
buffer line is toggled on and off with the PRINT SCREEN key. Note that non-ASCII characters,
such as CTRL, ALT, SHIFT, etc., are displayed as a block character on the buffer line.
If you want to send a special prosign, you can enclose it in “<” and “>”. To make a special
prosign, begin the prosign with “<”, type the characters of the prosign, and end the prosign with
“>”. For example, to make the prosign
types < SN>. This will remove the inter-character
spaces between the characters making it a prosign. Any prosign can be made this way, even
special local prosigns. Another method is to enclose the prosign with backslashes such as \SN\.
An easier way to send special prosign is press ALT key, type the characters of the prosign, and
then release the ALT key (this method does not work within the terminal program as the ALT
key is reserved for other functions).
Note: The open angle bracket “<” enables prosign mode and the close angle bracket “>”
disables prosign mode; while the backslash “\” toggles the prosign mode on and off. In
addition, pressing the ALT key enables prosign mode and releasing disables it. A word
space also disables prosign mode.
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