ICOM 297000 Manuale Utente

20

3

■ Receiving

q Set the audio level for the main band.

➥ Push the desired band’s [MAIN•BAND].

➥ Push and hold [DUP•MONI] for 1 sec. to open the

squelch.

➥ Rotate the main band’s [VOL] to adjust the audio level.

➥ Push the [DUP•MONI] to close the squelch.

w Set the squelch level.

➥ Rotate the main band’s [SQL] fully counterclockwise in

advance, then rotate the [SQL] clockwise until the noise
just disappears.

• When interference due to strong signals is received, rotate

the [SQL] clockwise again for attenuator operation. (p. 17)

e Set the operating frequency in the main band. (pgs. 11–13)
r When receiving a signal on the set frequency, squelch

opens and the transceiver emits audio.

• “BUSY” appears and the S/RF

indicator shows the relative
signal strength for the re-
ceived signal.

✔

The main band’s audio and squelch level can also
be adjusted with [

VOL

Y(TONE-1)]/[

VOL

Z 0(TONE-2)]

and [

SQL

Y

D(MUTE)]/[

SQL

Z

#(16KEY-L)], respectively.

• “VOL” for audio or “SQL” for squelch appears during set.

■ Transmitting

☞ NOTE: To prevent interference, listen on the channel be-

fore transmitting by pushing and holding [DUP•MONI] for
1 sec., or [

MONI

1(BANK)] on the microphone.

q Select the main band. (p. 11)
w Set the operating frequency. (pgs. 11–13)

• Select output power if desired. See section at right for details.

e Push and hold [PTT] to transmit.

• “$” appears.
• The S/RF indicator shows the output power selection.
• A one-touch PTT function is available. See p. ?? for details.
• “

” appears on the sub band screen according to the se-

lected frequency band.

r Speak into the microphone using your normal voice level.

• DO NOT hold the microphone too close to your mouth or speak

too loudly. This may distort the signal.

t Release [PTT] to return to receive.

IMPORTANT! (for 50 W transmission):
The IC-2820H is equipped with protection circuit to protect
the power amplifier circuit from high SWR 

(Standing Wave

Ratio)

and temperature. When a high SWR antenna or no

antenna is connected, or when the transceiver temperature
becomes extremely high, the transceiver reduces transmit
output power to 

15

W (approx.) automatically. 

CAUTION: Transmitting without an antenna will damage

the transceiver.

Show set level.

SQLY/Z

D/#

VOLY/Z

M/0

Appears when receiving a signal.