Packet Operation; Using Different Operating Modes - Icom IC-746 Instruction Manual

4

USING DIFFERENT OPERATING MODES

4-7 Packet operation

Å RECEIVING
[AF]
[SSB] [AM/FM]
ı TRANSMITTING
[MIC GAIN] [SSB]
[RF PWR]
NOTE: When connecting a TNC to the ACC socket
on the back of the transceiver, rotate [MIC GAIN]
fully counterclockwise and disconnect the micro-
phone from the [MIC] jack.
FREQUENCY INDICATION DURING AFSK
[EXAMPLE]: HF band, LSB mode, 2125/2325 Hz tone
36
Band keys
Tuning dials
Band keys
[AM/FM]
2325 Hz
200 Hz 2125 Hz
Carrier point
Before operating packet (AFSK) be sure to consult the
operating manual that came with your TNC.
Connect a TNC and personal computer (p. 68)
Push a band key to select an operating band.
Push a mode key to select an operating mode.
• Generally, LSB is used for packet operation on the HF
bands and FM is used for packet operation on the VHF
band.
Rotate [AF] to set the audio to a comfortable listen-
ing level.
Rotate the tuning dial to tune the desired signal.
• Received signal strength is indicated in the S-meter.
Before transmitting, monitor your selected operating
frequency to make sure transmitting won't cause inter-
ference to other stations on the same frequency.
Connect a TNC and personal computer (p. 68)
Push a band key to select an operating band.
Push a mode key to select an operating mode.
• Generally, LSB is used for packet operation on the HF
bands and FM is used for packet operation on the VHF
band.
Rotate [RF PWR] to set the output power.
• Relative strength of the transmitted signal is indicated in
the P meter while operating the TNC.
0
• When operating in SSB mode, adjust output power so
that the ALC reading in the ALC meter stays in the ALC
zone.
Transmit your AFSK signals using your computer's
keyboard.
When operating AFSK in SSB mode, the indicated fre-
quency is the signals carrier point.
[EXAMPLE]: VHF band, FM mode, 1200/2200 Hz tone
1000 Hz
2200 Hz 1200 Hz