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Icom IC-78 Manual

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OPERATION
26
ï RTTY (FSK) operation
q Connect a terminal unit as at p. 25.
w Select RTTY (or RTTY-R) mode with [MODE].
e Select the desired FSK tone and shift frequencies
as below.
r Set the desired frequency with the channel selec-
tor.
t Operate the connected PC or TNC (TO).
PRESETTING FOR RTTY
•Tone frequency
q Push [SET] for 1 sec. to enter
quick set mode
.
w Push [∫UP]/[√ DN] several times until “TON 2125”
appears, then rotate the channel selector to select
the desired tone frequency.
• Shift frequency
q Push [SET] for 1 sec. to enter
quick set mode
.
w Push [∫ UP]/[√ DN] several times until “SIFT 170”
appears, then rotate the channel selector to select
the desired tone frequency.
• RTTY reverse mode
Received characters are occasionally garbled when
the receive signal is reversed between MARK and
SPACE. This reversal can be caused by incorrect
TNC connections, settings, commands, etc.
To receive a reversed RTTY signal correctly, select
RTTY-R (RTTY reverse) mode.
•Push [MODE] for 1 sec. to select RTTY-R (RTTY re-
verse) mode.
ï RTTY (AFSK) operation
q Connect a terminal unit as on p. 25.
w Select SSB (LSB) mode with [MODE].
•Generally, LSB is used on the HF bands.
e Select the desired FSK tone/shift frequencies and
keying polarity the same way as FSK operation.
r Set the desired frequency with the main dial.
t Operate the connected PC or TNC (TO).
RTTY mark frequency
is set to 2125 Hz.
2125, 1615 and 1275
Hz are available.
RTTY shift frequency
is set to 850 Hz.
850, 425, 200 and
170 Hz are available.
RTTY mode
is selected.
ReverseNormal
BFO
170
Hz
2125
Hz
170
Hz
2125
Hz
BFO
mark
space
displayed freq.displayed freq.
mark
space
… 28 …


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