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79
2001 NEW
2001 NEW
10
DATA COMMUNICATION
■
Packet (AFSK) operation
Before operating packet (AFSK) be sure to consult the
operating manual that came with your TNC.
q
Connect a TNC and PC. (p. 78)
w
Push a band key to select an operating band.
e
Push [SSB] or [AM/FM] to select the desired operat-
ing mode.
• After LSB or USB is selected, push [SSB] for 1 sec. to
select LSB data or USB data mode, or after AM or FM is
selected, push [AM/FM] for 1 sec. to select AM data or
FM data mode.
• Generally, LSB is used on HF bands and FM is used for
packet operation on the VHF band.
r
Rotate the tuning dial to tune the desired signal.
t
Transmit your AFSK signals using your computer’s
keyboard.
• Rotate [RF PWR] to set the output power.
• Relative strength of the transmitted signal is indicated in
the Po meter while operating the TNC.
• When operating in SSB (data) mode, adjust output
power so that the ALC reading in the ALC meter stays
in the ALC zone.
NOTE:
When connecting a TNC to the ACC socket
on the rear panel, select SSB (LSB/USB) data mode
or disconnect the microphone and rotate [MIC
GAIN] fully counterclockwise.
When SSB data mode is selected, the audio input
from the [MIC] connector is automatically cut, and
the audio input from the [ACC(1)] is used.
Also, when the SSB data mode is selected, the fixed
setting listed below are selected automatically;
• Speech compressor : OFF
• Transmit bandwidth : MID
• Tx tone (Bass)
: 0
• Tx tone (Treble)
: 0
D
D
Frequency indication during AFSK operation
When operating AFSK in SSB mode, the indicated fre-
quency is the signals carrier point.
Band keys
[TX] indicator
[TRANSMIT]
[MIC GAIN]
[AM/FM] Tuning dial
Selected mode indicator appears
[SSB]
• Example—
LSB/LSB data mode
Mark freq.: 2125 Hz
Shift freq.: 200 Hz
2325 Hz
200 Hz
2125 Hz
Carrier point
(Displayed frequency)
IC-746PRO.qxd 02.4.2 11:31 Page 79
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