Icom IC-7700 - Manual (Page 87)

4-35
4
RECEIVE AND TRANSMIT
■
Data mode (AFSK) operation
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 or to select the desired oper-
ating mode.
r Push to turn data mode ON.
• One of “-D1,” “-D2” or “-D3” is additionally appears.
• During data mode selection, push and hold
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,
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 out-
put level so that the ALC meter reading doesn’t go out-
side 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.
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
✔
For your information
Carrier frequency is displayed when SSB data mode
is selected.
See the diagram left for the tone-pair example.
DATA
DATA
AM/FM SSB
200 Hz 2125 Hz
2325 Hz
Carrier frequency
(displayed frequency)
Appears
Main dial
Band keys
[AF] AM/FM DATA SSB
• Tone-pair example