Icom IC-7700 Instruction Manual - Page 73

4 RECEIVE AND TRANSMIT ■ Operating PSK [TX] indicator [RX] indicator Band keys [AF] RTTY/PSK DECODE F-3 Main dial Appears TX buffer screen FFT scope RX contents screen Water-fall Vector tuning indicator • Vector tuning indicator indication example Tuned BPSK signal Tuned QPSK signal A high-quality DSP-based PSK31 encoder/decoder is built-in to the IC-7700. When connecting a PC keyboard (p. 2-6), PSK31 operation can be performed without PSK software installed on your PC. If desired, you can also use your PSK software; consult the manual that comes with the software. q Push a band key to select the desired band. w Push RTTY/PSK to select PSK. • After PSK mode is selected, push and hold RTTY/PSK for 1 sec. to toggle between PSK and PSK-R modes. • "PSK" or "PSK-R" appears. e Push [DECODE] F-3 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 example 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 signals within the passband. Received PSK signals appear as vertical lines. 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 contents. 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. BPSK/QPSK idle signal Unmodulated signal 4-21