Packet (Afsk) Operation - Icom IC-7100 Advanced Instructions

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18
DATA COMMUNICATION

Packet (AFSK) operation

Before operating packet (AFSK), be sure to consult the
operating manual that came with your TNC.
Connect the TNC and PC. (p. 18-2)
q
Select the desired band. (p. 3-6)
w
Select the Data mode of SSB, AM or FM. (p. 3-17)
e
Rotate the Dial to tune the desired signal and de-
r
code it correctly by using the tuning indicator of the
TNC or software.
• When a signal is received, the S-meter is displayed ac-
cording to the signal strength level.
• In the SSB data mode, the ¼ tuning function can be used
for critical tuning. (p. 3-10)
Operate the PC (software) or TNC to transmit.
t
• When operating in the SSB data mode, adjust the TNC
output level so that the ALC meter reading doesn't go
outside the ALC zone.
Frequency display during AFSK operation
When operating AFSK in the SSB mode, the displayed
frequency is the signal's carrier point.
• Tone-pair example
HF band/LSB data mode
Mark frequency: 2125 Hz
Shift frequency: 200 Hz
2325Hz
200Hz
Carrier point
(Displayed frequency)
NOTE: When the data mode is selected, the audio
input from the [MIC] connector is automatically cut,
and the audio input from the [ACC] socket is used as
the default.* 1
Also, when the data mode is selected, the fixed set-
tings listed below are automatically selected:
• Speech compressor: OFF
• Transmit bandwidth: MID*
• Tx tone (Bass): 0
• Tx tone (Treble): 0
* 1 Select the connector(s) for the desired modulation to in-
put in the "DATA MOD" item of the Set mode. (p. 17-24)
* 2 Fixed to the default value of 300 Hz to 2700 Hz.
2125Hz
2
Appears when the data mode is selected.
18-3