Operating Rtty (Fsk) - Icom IC-7700 Instruction Manual

■ Operating RTTY (FSK)

[TX] indicator [RX] indicator
[AF]
RTTY/PSK
Appears
TX buffer screen
FFT scope
RX contents screen
Water-fall
Band keys
Main dial
DECODE
F-3
A DSP-based high-quality Baudot RTTY encoder/
decoder is built-in to the IC-7700. When connecting
a PC keyboard (p. 2-6), RTTY operation can be per-
formed 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 termi-
nal or TNC.
q Push a band key to select the desired band.
w Push RTTY/PSK
• 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 [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 change 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 displayed 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
change when transmitted.
• To cancel the transmission, press [F12] twice.
r Press [F12] of the keyboard to return to receive.
4-13
RECEIVE AND TRANSMIT
to select RTTY.
F-3 to display the decode
4
RTTY/PSK