Icom IC-7700 - Manual (Page 65)

4-13
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Operating RTTY (FSK)
A DSP-based high-quality Baudot RTTY encoder/de-
coder is built-in to the IC-7700. When connecting a PC
keyboard (p. 2-6), RTTY operation can be performed
without an external RTTY terminal, TNC or PC.
If you would rather use your RTTY terminal or TNC,
consult the manual that comes with the RTTY terminal
or TNC.
q Push a band key to select the desired band.
w Push to select RTTY.
• After RTTY mode is selected, push and hold
for 1 sec. to toggle between RTTY and RTTY-R modes.
• “RTTY” or “RTTY-R” appears.
e Push [F-3•DECODE] to display the decode screen.
• The IC-7700 has a built-in Baudot decoder.
r To tune the desired signal, aim for a symmetrical
waveform and ensure the peak points align with the
mark (2125 Hz) and shift (170 Hz) frequency lines
in the FFT scope.
• The S-meter indicates received signal strength when
signal is received.
t Press [F12] on the connected keyboard to transmit.
• [TX] indicator lights red.
y Type from the keyboard to enter the contents that
you want to transmit.
• The typewritten contents are indicated in the TX buffer
screen and transmitted immediately.
• The text color will be changed when transmitted.
• Press one of [F1]–[F8] to transmit the TX memory con-
tents.
u Press [F12] on the keyboard to return to receive.
✔
For your convenience
The transmission contents can be typed before being
transmitted.
q Perform the steps q to r above.
w Type from the connected keyboard to enter the
message that you want to transmit.
• The typewritten contents are indicated in the TX buffer
screen.
e Press [F12] of the connected keyboard to transmit
the typewritten contents.
• The color of displayed text, in the TX buffer screen, will
be changed when transmitted.
• To cancel the transmission, press [F12] twice.
r Press [F12] of the keyboard to return to receive.
RTTY/PSK
RTTY/PSK
FFT scope
TX buffer screen
RX contents screen
Water-fall
Appears
[TX] indicator [RX] indicator
[AF] Main dial
Band keys
RTTY/PSK
F-3
DECODE
4
RECEIVE AND TRANSMIT