3 BASIC OPERATION
■Receiving and transmitting
CAUTION: Transmitting without an antenna may dam- 
age the transceiver.
qPush [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.
eTo 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. |
uPush 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.
iRelease [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.
• 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. |
yPush [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.
q y | e |
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| VHF MARINE | iM502 |
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| DISTRESS |
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| WATERPROOF |
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| DSC/ENT | SCAN | CH/WX | 16 9 | |
| POS |
| TAG | DW U/I/C | |
POWER | HI/LO |
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| LO/DX |
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| IC SCR | ||
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VOL | SQL |
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w r t
u i
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