Data Mode (Afsk) Operation - Icom IC-7851 Instruction Manual

5
RECEIVE AND TRANSMIT

■ Data mode (AFSK) operation

When operating AMTOR or PACKET with a PC appli-
cation software, consult the manual that comes with
the software.
Before transmitting, monitor the operating frequency
to make sure transmitting won't cause interference to
other stations on the same frequency.
❍ Connect a PC or other device to the transceiver.
3-8)
q
Push a band key to select a desired band.
w
Push the Mode key [SSB] or [AM/FM] to select the
desired mode.
• Normally, the LSB mode is used in the HF band, and the
FM mode is used in the VHF band.
e
Push [DATA] to turn ON the data mode.
• In the data mode, hold down [DATA] for 1 second to
sequentially toggle the data mode between D1, D2, and
D3.
• Push [DATA] again to turn OFF the data mode.
r
Rotate [MAIN DIAL] to tune in the desired signal
and decoded correctly.
• Also use the tuning indicator of the PC software.
• In the SSB data mode,
for critical tuning.
t
Push the Multi-function [METER](
the Po meter.
y
Rotate [RF PWR] to adjust the output power.
• The TX power readout displays the setting level.
u
Transmit by using the PC (software).
• The [TX] indicator lights red.
• When operating in the SSB data mode, adjust the PC's
output level so that the ALC meter reading doesn't go
outside the ALC zone.
i
Transmit the AFSK signal by using the keyboard.
• After your transmission is finished, returns to receive.
✔ For your information
The carrier frequency is displayed when the SSB data
mode is selected.
See the diagram to the right for a tone-pair example.
1 ⁄ tuning function can be used
4
) key to select
(p.
[TRANSMIT]
[RF PWR]
() Multi-function keys
NOTE: When the SSB data mode is selected, the au-
dio input from [ACC 1] is used for modulation input
instead of [MIC].
The following settings are used for SSB data trans-
mission.
• [COMP]:
• Tx bandwidth:
• Tx Tone (Bass):
• Tx Tone (Trebles): 0
• 2125 Hz/2295 Hz tone-pair in the LSB mode
Mark
5-40
Band keys
TX indicator MAIN
Mode keys [DATA]
OFF
MID
0
2295 Hz
170 Hz 2125 Hz
Space Carrier frequency
(displayed frequency)
[MAIN DIAL]