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.
yPush 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.
eWhile pushing and holding [HI/LO], push [DIAL] to change the channel group. (p. 6)
• The European version has International channels only.
rRotate 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.
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| VHF MARINE | iM503 |
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| 16 |
| WATER RESISTANT |
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| DUAL | SCAN | DIAL | CALL |
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POWER | HI/LO |
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| DIMMER |
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VOL | SQL |
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