D Ata Mode (Afsk) Operation - Icom IC-7850 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)
Push a band key to select a desired band.
q
Push the Mode key [SSB] or [AM/FM] to select the
w
desired mode.
• Normally, the LSB mode is used in the HF band, and the
FM mode is used in the VHF band.
Push [DATA] to turn ON the data mode.
e
• 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.
Rotate [MAIN DIAL] to tune in the desired signal
r
and decoded correctly.
• Also use the tuning indicator of the PC software.
• In the SSB data mode,
for critical tuning.
Push the Multi-function [METER](
t
the Po meter.
Rotate [RF PWR] to adjust the output power.
y
• The TX power readout displays the setting level.
Transmit by using the PC (software).
u
• 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.
Transmit the AFSK signal by using the keyboard.
i
• 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]