Data Mode (Afsk) Operation - Icom ic-7700 Instruction Manual

■ Data mode (AFSK) operation

[AF]
SSB AM/FM
Appears
• Mark and Space tones of RTTY in the AFSK
mode operating in the LSB mode
170 Hz
Mark Space Carrier frequency
Band keys
Main dial
DATA
2295 Hz
2125 Hz
(displayed frequency)
When operating RTTY, SSTV,
with your TNC and/or PC software in the AFSK mode,
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
SSB
erating mode.
r Push to turn data mode ON.
DATA
• One of "-D1," "-D2" or "-D3" is additionally appears.
• During data mode selection, hold down
second 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
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 data mode 1 (D1) is selected, the
audio input from the [ACC1 (pin 4)] is used for
transmission instead of [MIC]'s.
nector can be changed in ACC set mode (pp. 12-7, 12-8).
DATA1: [ACC], DATA2: [MIC] and [ACC], DATA3: [MIC] are
defaut settings. )
The fixed condition is used for SSB data transmis-
sion as follows:
• [COMP]
• Tx bandwidth
• Tx Tone (Bass)
• Tx Tone (Treble) : 0
✔ For your information
Carrier frequency is displayed when SSB data mode
is selected.
See the diagram to the left for the tone-pair example.
4-35
RECEIVE AND TRANSMIT
AMTOR or PACKET
to select the desired op-
AM/FM
⁄ tuning function can be
1
4
(Modulation input con-
: OFF
: MID
: 0
4
for 1
DATA