I Data Mode (Afsk) Operation - Icom IC-7800 Instruction Manual

4
RECEIVE AND TRANSMIT

I Data mode (AFSK) operation

[AF] [SSB] [AM/FM]
Appears
200 Hz
Band keys
[DATA] Main dial
2325 Hz
2125 Hz
Carrier frequency
(displayed frequency)
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. 2-8)
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, pushing [DATA] for 1 sec.
to select data mode 1 (D1), 2 (D2) and 3 (D3) in se-
quence.
t Rotate the main dial to tune into the desired signal
and decoded correctly.
• Also use the tuning indicator of the TNC or software.
• During SSB data mode,
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]
• Tx bandwidth
• Tx Tone (Bass)
• 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.
4-34
1 ⁄ tuning function can be used
4
: OFF
: MID
: 0