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172
15
DATA COMMUNICATION
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Packet (AFSK) operation
Before operating packet (AFSK), be sure to consult the
operating manual that came with your TNC.
q
Connect the TNC and PC. (p. 171)
w
Select the desired band. (p. 35)
e
Push [SSB] or [AM/FM] to select the desired oper-
ating mode. (p. 43)
r
Hold down the same key you pushed in step
e
to
select the Data mode.
t
Rotate [MAIN DIAL] to select the desired fre-
quency.
y
Transmit your AFSK signals using your PC’s key-
board.
• Rotate [RF POWER] to set the output power.
• While using a TNC, the relative strength of the transmit
-
ted signal is indicated on the Po meter.
• When operating in the SSB data mode, adjust the out
-
put power so that the ALC meter reading stays in the
ALC zone.
NOTE:
When connecting the TNC to the ACC socket
on the rear panel, select the USB, LSB, AM and FM
data mode, or disconnect the microphone and ro-
tate [MIC GAIN] fully counterclockwise.
When the “DATA MOD” item is set to “ACC” (default)
in the Set mode, and the data mode is selected,
the audio input from the [MIC] connector is auto-
matically cut. In that case, the audio input from the
[ACC] socket is used.
Also, when the data mode is selected, the fixed set-
tings listed below are automatically selected;
• Speech compressor : OFF
• Transmit bandwidth : MID (
Fixed to the default
value; 300 Hz to 2700 Hz.
)
• Tx tone (Bass)
: 0
• Tx tone (Treble)
: 0
• Example—
LSB/LSB data mode
Mark freq.: 2125 Hz
Shift freq.: 200 Hz
2325 Hz
200 Hz
2125 Hz
Carrier point
(Displayed frequency)
When operating AFSK in the SSB mode, the displayed
frequency is the signal’s carrier point.
D
Frequency display during AFSK operation
Appears when the FM data mode is selected.
[AM/FM]
[MAIN DIAL]
[SSB]
A G C
D U P
A F C
T O N
S C P
M 1