Receiving And Transmitting - Icom ic-m423 Instruction Manual

4
BASIC OPERATION

■ Receiving and transmitting

CAUTION: Transmitting without an antenna will damage
the transceiver.
Hold down [PWR](Dial) to turn ON the power.
q
Set the audio and squelch levels. (p. 15)
w
First, open the squelch. Then, adjust the audio output
➥
level. After that, adjust the squelch level until the noise
just disappears.
Change the channel group. (p. 12)
e
Push [ ∫]/[√] to select a channel. (pp. 11, 12)
r
• Pushing [Y]/[Z] on the microphone selects only Favorite chan-
nels.
• When receiving a signal, "
heard.
• Further adjustment of the volume level may be necessary.
Push [LO/DX] to turn the receive Attenuator function ON
t
or OFF, if necessary.
• For only U.S.A. and Australian version transceivers.
• "LOCAL" is displayed when the receive Attenuator function is
ON.
Push [HI/LO] to select the output power, if necessary.
y
• Pushing [H/L] or [HI/LO] on the microphone also select the out-
put power.
• "25W" is displayed when high power is selected, and "1W" is
displayed when low power is selected.
• Choose low power for short range communications, choose high
power for longer distance communications.
• Some channels are for only low power.
14
" is displayed and audio is
Hold down [PTT] to transmit, then speak at your normal
u
voice level.
• " " is displayed.
• Channel 70 cannot be used for transmission other than DSC.
Release [PTT] to receive.
i
Information
✓
The Noise Cancel function reduces random noise components
in the transmit and/or receive signal. See page 78 for details.
Simplex channels, 3, 21, 23, 61, 64, 81, 82, and 83 CAN-
NOT be lawfully used by the general public in U.S.A. wa-
ters.
IMPORTANT: To maximize the readability of your transmit-
ted signal, pause a few seconds after pushing [PTT], hold
the microphone 5 to 10 cm (2 to 4 inches) from your mouth
and speak at a normal voice level.
NOTE for the TOT (Time-out Timer) function
✓
The TOT function inhibits continuous transmission beyond a
preset time period after the transmission starts.
10 seconds before transmission is cutoff, a beep sounds to
indicate the transmission will be shut down and "TOT" is dis-
played in the channel name field. Transmission is not possible
for 10 seconds after this shut down.