I Receiving And Transmitting - Icom IC-M421 Instruction Manual

3
BASIC OPERATION

I Receiving and transmitting

CAUTION: Transmitting without an antenna may damage
the transceiver.
q Rotate [VOL] to turn power ON.
w Set the audio and squelch levels.
➥ Rotate [SQL] fully counterclockwise in advance.
➥ Rotate [VOL] to adjust the audio output level.
➥ Rotate [SQL] clockwise until the noise disappears.
While in the DSC operation, please make sure you set
the squelch correctly.
e To change the channel group, push both [L] and [M] on
the transceiver. (p. 7)
r Push [L] or [M] to select the desired channel. (pgs. 6, 7)
• When receiving a signal, "
from the speaker.
• Further adjustment of [VOL] may be necessary at this point.
t Push [HI/LO] on the microphone to select the output
power if necessary.
• " " or " " appears when high or low power is selected, re-
spectively.
• Choose low power for short range communications, and choose
high power for longer distance communications.
• Some channels are for low power only.
y Push and hold [PTT] to transmit, then speak into the mi-
crophone (M).
• " " appears.
• Channel 70 cannot be used for transmission other than DSC.
u Release [PTT] to receive.
8
" appears and audio is emitted
IMPORTANT: To maximize the readability of your trans-
mitted signal, pause a few sec. after pushing [PTT], hold
the microphone (M) 5 to 10 cm from your mouth and speak
at a normal voice level.
e r
✔ NOTE for TOT (Time-out Timer) function
The TOT function inhibits continuous transmission over a pre-
set time period after the transmission starts.
A beep sounds 10 sec. before the TOT function activates, to
indicate the transmission will be shut down and "
pears on the channel comment indicator. Transmission is not
possible for 10 sec. after this transmission shut down.
q y u
M
w r t
M: Microphone
" ap-