user manual
■ 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 To change the channel group, push [CH/WX•DW•U/I/C]
while pushing [HI/LO]. (p. 6)
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 [LO/DX] to turn the receive attenuator ON or OFF if
necessary.
•“LOCAL” appears when the receive attenuator is in use.
y 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.
u Push and hold [PTT] to transmit, then speak into the mi-
crophone.
•“TX” appears.
•Channel 70 cannot be used for transmission (for GMDSS use).
Simplex channels, 3, 21, 23, 61, 64, 81, 82 and 83 CAN-
NOT be lawfully used by the general public in U.S.A. wa-
ters.
i Release [PTT] to receive.
IMPORTANT: To maximize the readability of your trans-
mitted signal, pause a few sec. after pushing [PTT], hold
the microphone 4 to 6 inches (10 to 15 cm) from your
mouth and speak at a normal voice level.
WATERPROOF
SCAN
TAG
DSC/ENT
POS
HI/LO
POWER
VOL
iM502
VHF MARINE
SQL
LO/DX
IC SCR
CH/WX
DW U/I/C
916
DISTRESS
q
w
e
r r yt
yui
3
BASIC OPERATION
8