Receiving And Transmitting - Icom IC-M604A Instruction Manual

■ Receiving and transmitting

CAUTION: Transmitting without an antenna will damage
the transceiver.
q Push [POWER] to turn power ON.
w Set the audio and squelch levels.
➥ Rotate [SQL] fully counterclockwise fi rst.
➥ Rotate [VOL] to adjust the audio output level.
➥ Rotate [SQL] clockwise until the noise disappears.
e While holding down [H/L], push [CH/WX] several times to
change the channel group. (p. 8)
r Rotate [SELECTOR] to select a channel.
• Pushing the keypad keys, or [Y]/[Z] on the microphone, also
selects a channel.
• When receiving a signal, "
from the speaker.
• You may need to further adjust [VOL].
t Push [O], then push [6•
LO/DX
uator function ON or OFF, if necessary.
• " " appears when the receive Attenuator is ON.
y Push [H/L] to select the output power, if necessary.
• " " or " " appears when high or low power is selected.
• Choose low power for short range communications, choose
high power for longer distance communications.
• Some channels are restricted to only low power.
u Hold down [PTT] to transmit, then speak into the micro-
phone at your normal voice level.
• " " appears.
• Channel 70 cannot be used for transmission other than DSC.
i Release [PTT] to receive.
(pp. 6, 7, 61)
" appears and audio is heard
] to turn the receive Atten-
BASIC OPERATION
Simplex channels, 3, 21, 23, 61, 64, 81, 82 and 83 CAN-
NOT be lawfully used by the general public in U.S.A. waters.
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.
y e e
iM604
VHF MARINE
U/I/C
9
16
MIC
VOL SQL
w r
✔ NOTE for TOT (Time-out Timer) function
The TOT function inhibits continuous transmission over a pre-
set time period after the transmission starts.
10 seconds before the TOT function activates, a beep sounds
to indicate the transmission will be shut down and "
pears on the channel comment indicator. Transmission is not
possible for 10 seconds after this transmission shut down.
3
r t u i
Microphone
DISTRESS
q r e y
" ap-
3
9