9
3
BASIC OPERATION
3
■ 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 in advance.
➥ Rotate [VOL] to adjust the audio output level.
➥ Rotate [SQL] clockwise until the noise disappears.
e While pushing and holding [H/L], push [CH/WX] several
times to change the channel group. (p. 8)
r Rotate [SELECTOR] to select a channel. (pp. 6, 7, 57)
• Pushing the keypad or [Y]/[Z] on the microphone also selects
a channel.
• When receiving a signal, “BUSY” appears and audio is emitted
from the speaker.
• Further adjustment of [VOL] may be necessary.
t Push [F], then push [6•
LO/DX
] to turn the receive Atten-
uator function ON or OFF, if necessary.
• “LOC” appears when the receive Attenuator is ON.
y Push [H/L] to select the output power if necessary.
• “25W” or “1W” appears when high or low power is selected, re-
spectively.
• Choose low power for short range communications, choose
high power for longer distance communications.
• Some channels are for low power only.
u Push and hold [PTT] to transmit, then speak into the mi-
crophone.
• “TX” appears.
• Channel 70 cannot be used for transmission other than DSC.
i Release [PTT] to receive.
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 sec. after pushing
[PTT], hold the
microphone 5 to 10 cm (2 to 4 inches) from your mouth
and speak at a normal voice level.
VOL
iM604
VHF MARINE
MIC
U/I /C
9
16
SQL
DISTRESS
Microphone
w
ee t u i
qr r ye
y r
✔ NOTE for TOT (Time-out Timer) function
The TOT function inhibits continuous transmission over a
preset 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 “
TOT” ap-
pears on the channel comment indicator. Transmission is not
possible for 10 sec. after this transmission shut down.
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