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MFJ-1278B MULTI-MODE BASIC OPERATION
Note: If the MFJ-1278B is not in transmit mode (i.e. in receive mode), then in order to
initiate transmission from a buffer, you must type CONTROL-T twice then enter a
number for the buffer. You can tell if the MFJ-1278B is in transmit mode, by
observing the PTT LED on the front panel. If PTT LED is lit, MFJ-1278B is in
transmit mode.
Once the MFJ-1278B completes the transmission, press a CONTROL-R. When the MFJ-
1278B receives the CONTROL-R from the computer, it will return to receive mode. When
the MFJ-1278B is in receive mode, note that the PTT and STA leds are not lit.
Some terminal programs do not support the CONTROL-T or CONTROL-R characters.
The MFJ-1278B require the CONTROL-T and CONTROL-R characters to swtich between
transmit and receive modes.
If the terminal program does not support the CONTROL-T and CONTROL-R characters,
you can re-assign the ASENDCHAR and ARCVCHAR commands in the MFJ-1278B to
other keys. See Chapter 6 of this manual for detail on the ASENDCHAR and ARCVCHAR
commands.
Note: When operating RTTY or ASCII it is recommended that you operate at about 50% of
full power. This is to prevent damage to the finals of your radio. Some modern
radios allow operation of RTTY and ASCII at full power. You should consult the
owner's manual of your radio to see what is the acceptable power level at which your
radio should operate.
BAUDOT RTTY OPERATION HINTS
In this section we will cover a few of operative hints for the RTTY and ASCII modes.
To set the MFJ-1278B to RTTY mode type:
MODE HB <ENTER>
for HF operation. This sets the MFJ-1278B to the standard RTTY mode that most amateurs
use. On HF this is 45 baud or 60 wpm. As mentioned earlier, if you do not designate a speed
after the two letter, the MFJ-1278B selects the default of 45 baud.
Some RTTY bulletin boards use 75 baud or 100 wpm, in which case you should type:
MODE HB,75
The number after the "HB" sets the character transmission and receive speeds in baud. Some
operators will refer to the speed as words-per-minute. However, the normal terminology is to
refer to the speed in BAUD RATE. Although speeds up to 300 baud are available, only 45
and 75 baud are most commonly used.