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Icom IC-703 - I Packet (AFSK) Operation; D Frequency Indication During AFSK Operation

Icom IC-703
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68
10
DATA COMMUNICATION
Before operating packet (AFSK) be sure to consult
the operating manual that came with your TNC.
q Connect a TNC and PC as left page.
w Push [
(Y)BAND]/[(Z)BAND] to select the desired
band.
e Push [MODE] momentarily to select SSB (LSB)
mode (or select SSB-D mode).
After USB mode is selected, push [MODE] for 1 sec.
to toggle between USB and LSB modes.
After RTTY mode is selected, push [MODE] for 1 sec.
to toggle between RTTY and SSB-D modes.
Generally, LSB is used on the HF bands and FM is
used for the 50 MHz band.
r Rotate [AF] to set audio to a comfortable listening
level.
t Rotate the main dial to tune a desired signal.
S-meter indicates received signal strength.
y Transmit your AFSK signals using your computer’s
keyboard.
The TX indicator lights red.
NOTE: When connecting a TNC to the ACC socket
on the rear panel, select SSB-D mode or discon-
nect the microphone and adjust ‘MIC GAIN’ to 0 in
quick set mode.
When SSB-D mode is selected, the audio input
from the [MIC] connector is automatically cut, and
the audio input from the [ACC] is used.
R
LSB
CH
VFO A
P
O
S1
5
5379
20 40
10
60dB
USB CW R
TT
Y
AM WFM
M4 1/4 TON AGC
[TX] indicator [MODE] Main dial[AF]
[Y]
[Z]
USB or LSB blinks when
SSB-D mode is selected.
Packet (AFSK) operation
When operating AFSK in SSB mode, the indicated
frequency is the signals carrier point.
Example SSB-D mode
Mark freq.: 2125 Hz
Shift freq.: 200 Hz
2325 Hz
200 Hz 2125 Hz
Carrier point
(Displayed frequency)
D Frequency indication during AFSK operation
10

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