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■ Receiving and transmitting
CAUTION: Transmitting without an antenna may dam-
age 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 [HI/LO], push [DIAL] to change
the channel group. (p. 6)
•The European version has International channels only.
r Rotate the channel selector or push [Y]/[Z] on the micro-
phone to select the desired channel.
•When receiving a signal, “BUSY” appears and audio is emitted
from the speaker.
•Further adjustment of [VOL] may be necessary at this point.
•Use the optional voice scrambler function for privacy. (p. 10)
t Push [HI/LO] to select the output power if necessary.
•“25W” or “1W” appears when high or low power is selected, re-
spectively.
•Choose low power to conserve power, 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.
•“TX” appears.
•Channel 70 cannot be used for transmission (for GMDSS use).
u Release [PTT] to receive.
IMPORTANT: To maximize the readability of your trans-
mitted signal, pause a few sec. after pushing [PTT], hold
the microphone 2 to 5 cm from your mouth and speak at a
normal voice level.
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CALLDUAL
SCAN
WATER RESISTANT
TAG
DIAL
DIMMER
HI/LO
POWER
VOL
iM503
VHF MARINE
SQL
q
w
e
rrt
tyu
3
BASIC OPERATION
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