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MFJ-1278B MULTI-MODE BASIC OPERATION
CW OPERATION
The MFJ-1278B provides many unique features in the CW mode that are not found in other
multi-mode controllers.
The MFJ-1278B can key your CW transceiver in the CW mode of operation. The MFJ-
1278B can accommodate either positive (direct) or negative (grid block) keying voltages.
The MFJ-1278B also has a code practice mode built-in, that can be used with VHF FM
radios in the Modulated CW (MCW) mode. This mode holds the radio PTT line down and
feeds keyed audio into the microphone input.
The CW mode in the MFJ-1278B is very easy and versatile. Take for instance, the user can
send code either from the computer keyboard or a key paddle. The key paddle must be
connected to the CW KEY-IN jack on the back panel of the MFJ-1278B. When working
CW on the MFJ-1278B with a key paddle you have a full fledged Memory Keyer at your
disposal. The MFJ-1278B provides the user with ten programmable memory buffers. These
memory buffers are able to be programmed with message of up to 120 characters. Besides
the buffer memory, MFJ-1278B provides automatic serial numbering. The WEIGHT
command determines the DOT/SPACE ratio. This is to allow compensation for leading or
trailing edge delays in many transceiver keying circuits. The built in random code generator
allows CW code practice. A TUNE command is also built in for radio tuning.
The MFJ-1278B supports all Alpha and Numeric characters. It also will transmit and receive
punctuations and major prosigns as listed in Table 4-4 below:
PROSIGNS ASCII CHARACTER Keyboard Symbol PROCEDURE
SK *
End of Work
AS &
Wait
AR +
End of Message
BT =
Break
SN !
Understood
KA %
Signal Starting
K K
Invitation to Transmit
DN /
KN (
Response from Contacted Call Only
PUNCTUATIONS
, COMMA : COLON
. PERIOD ; SEMI-COLON
? QUESTION MARK ' APOSTROPHE
$ DOLLAR SIGN - HYPHEN
( LEFT PARENTHESIS " QUOTATION
) RIGHT PARENTHESIS
Table 4
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4
: CW Prosigns and Punctuations