Icom IC-7700 - Manual (Page 73)

4-21
■
Operating PSK
A high-quality DSP-based PSK31 encoder/decoder is
built-in to the IC-7700. When connecting a PC key-
board (p. 2-6), PSK31 operation can be performed
without PSK software installed on your PC.
If desired, you can also use your PSK software; con-
sult the manual that comes with the software.
q Push a band key to select the desired band.
w Push to select PSK.
• After PSK mode is selected, push and hold
for 1 sec. to toggle between PSK and PSK-R modes.
• “PSK” or “PSK-R” appears.
e Push [F-3•DECODE] to display the decode screen.
• The IC-7700 has a built-in PSK31 decoder.
r Tune to the desired signal with the main dial.
• The signal is properly tuned when the radiated lines in
the vector tuning indicator narrow, as show in the exam-
ple below.
• The radiated lines in the vector tuning indicator may be
displayed sporadically.
• When a PSK signal is received, the water-fall display is
activated.
• The water-fall display shows the signal condition within
the passband and a vertical line appears when a PSK
signal is received.
t Press [F12] of the connected keyboard to transmit.
• [TX] indicator lights red.
y Type from the connected keyboard to enter the
message 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] of 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 message is shown in the TX buffer screen.
e Press [F12] of the connected keyboard to transmit
the message.
• 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
Vector tuning indicator
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
• Vector tuning indicator indication example
Tuned BPSK signal
BPSK/QPSK idle signal Unmodulated signal
Tuned QPSK signal