Rtty (Fsk) Operation; Rtty (Afsk) Operation - Icom IC-718 Instruction Manual

5
RECEIVE AND TRANSMIT
ï RTTY (FSK) operation
q Connect a terminal unit as at p. 34.
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 main dial.
t Operate the connected PC or TNC (TU).
PRESETTING FOR RTTY
• Tone frequency
q Push [SET] for 1 sec. to enter quick set mode.
w Push [∫ UP]/[√ DN] one or more times until
"TON 2125" appears, then rotate the main dial to
select the desired tone frequency.
• Sift frequency
q Push [SET] for 1 sec. to enter quick set mode.
w Push [∫ UP]/[√ DN] one or more times until
"SIFT 170" appears, then rotate the main dial 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
reverse) mode.
ï RTTY (AFSK) operation
q Connect a terminal unit as p. 33.
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 (TU).
34
Normal
mark
space
2125
170
Hz
Hz
BFO
displayed freq.
RTTY mode
is selected.
RTTY mark frequency
is set to 2125 Hz.
2125, 1615 and 1275
Hz are available.
RTTY sift frequency is
set to 850 Hz.
850, 425, 200 and
170 Hz are available.
Reverse
mark
space
2125
170
Hz
Hz
BFO
displayed freq.