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■ Receiving and transmitting
CAUTION: Transmitting without an antenna will damage
the transceiver.
q Push [POWER] to turn ON the transceiver.
w Set the audio and squelch levels.
➥ Rotate [SQL] fully counterclockwise first.
➥ 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, "BUSY" is displayed and audio is
heard from the speaker.
• You may need to further adjust [VOL].
t Push [O], then push [6•
LO/DX
Attenuator function ON or OFF, if necessary.
• "LOC" is displayed when the receive Attenuator is ON.
y Push [H/L] to select the output power, if necessary.
• "25W" or "1W" is displayed 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
microphone at your normal voice level.
• "TX" is displayed.
• Channel 70 cannot be used for transmission other than DSC.
i Release [PTT] to receive.
(pp. 6, 7, 61)
] to turn the receive
Simplex channels, 3, 21, 23, 61, 64, 81, 82 and 83 CANNOT
be lawfully used by the general public in USA waters.
IMPORTANT: To maximize the readability of your
transmitted 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
VHF MARINE
iM604
U/I/C
MIC
VOL
SQL
w
r
✔ NOTE for Time-out Timer (TOT) function
The TOT function inhibits continuous transmission over a
preset period of time after the transmission starts.
10 seconds before the TOT function activates, a beep sounds
to indicate the transmission will be shut down and "TOT" is
displayed on the channel comment indicator. Transmission is
not possible for 10 seconds after this transmission shut down.
BASIC OPERATION
r
t u i
Microphone
9
16
DISTRESS
q
r
e
y
3
3
9
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