Icom IC-7700 Instruction Manual - Page 87

4 RECEIVE AND TRANSMIT ■ Data mode (AFSK) operation Band keys [AF] SSB AM/FM Appears DATA Main dial When operating AMTOR or PACKET with your TNC and/or PC software, consult the manual that comes with the TNC and/or the software. q Connect a PC and TNC to the transceiver. (p. 2-9) w Push a band key to select the desired band. e Push SSB or AM/FM to select the desired oper- ating mode. r Push DATA to turn data mode ON. • One of "-D1," "-D2" or "-D3" is additionally appears. • During data mode selection, push and hold DATA for 1 sec. to select data mode 1 (D1), 2 (D2) and 3 (D3) in sequence. t Rotate the main dial to tune to the desired signal and decode it correctly. • Also use the tuning indicator of the TNC or software. • During SSB data mode, the 1⁄4 tuning function can be used for critical tuning. y Operate the PC (software) or TNC to transmit. • When operating in SSB data mode, adjust the TNC output level so that the ALC meter reading doesn't go outside the ALC zone. NOTE: When SSB data mode is selected, the audio input from the [ACC1 (pin 6)] is used for transmis- sion instead of [MIC]'s. (Modulation input connector can be changed in ACC set mode. (pgs. 12-7, 12-8)) The fixed condition is used for SSB data transmis- sion as follows: • [COMP] : OFF • Tx bandwidth : MID • Tx Tone (Bass) : 0 • Tx Tone (Trebles): 0 • Tone-pair example 2325 Hz 200 Hz 2125 Hz Carrier frequency (displayed frequency) ✔ For your information Carrier frequency is displayed when SSB data mode is selected. See the diagram left for the tone-pair example. 4-35