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MFJ-1278B MULTI-MODE BASIC OPERATION
If you do not specify a baud rate for the RTTY or ASCII modes, the MFJ-1278B selects the
default baud rates. The default baud rates for the RTTY and ASCII modes are 45 and 110
baud respectively. You can select a desired speed by typing the baud rate after the two
character code. For example, to enter 110 baud VHF Baudot RTTY, you would type:
MODE VB,110 <ENTER>
Note: The only baud rates that you can select are those the MFJ-1278B is capable of
receiving and transmitting. Selecting an illegal baud rate will cause the MFJ-1278B
to respond with an error message, such as:
bad?
In this case the MFJ-1278B will change to default settings and return to the command mode.
RTTY and ASCII Receiving
After properly setting the MFJ-1278B to the desired RTTY or ASCII mode, type "K" on the
computer keyboard to enter CONVerse mode. The STA LED on the MFJ-1278B will light.
MFJ-1278B is ready to receive RTTY or ASCII signals tuned in by your radio.
Set the volume of your radio for normal listening level. Tune your radio until you hear a
signal that you want to decode. Fine tune your receiver until the 10th or 11th segments are lit
on the tuning indicator. When you have the signal tuned in properly, the DCD LED will light
and the MFJ-1278B will start to decode the signal.
If the displayed text appears garbled, then the specified speed in the MODE command might
be incorrect. Garbled displayed text may mean that the signal you are trying to copy is
encrypted. If you suspect an encrypted signal, you can use the RBITMASK command to
match the inversion pattern of the signal. If you suspect that the speed is incorrect, then you
can specify a new speed setting. The speed is set by using the MODE command.
RTTY and ASCII Transmitting
While the MFJ-1278B is in RTTY or the ASCII mode and it is in command mode, you can
initiate RTTY or ASCII transmission by typing:
K <ENTER>
followed by a CONTROL-T.
The MFJ-1278B is now ready to transmit. Type your message on the keyboard. The MFJ-
1278B will transmit your message as it is received from your computer.
Messages stored in memory buffers 0 thru 9 can be transmitted when in RTTY or ASCII
modes. To transmit a memory buffer, when already in transmit mode, type: