ICOM iM304 User Manual

BASIC OPERATION

■ Receiving and transmitting

CAUTION:

Transmitting without an antenna will damage

the transceiver.

q Rotate [VOL] 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 Push [U/I/C] (both [Y] and [Z]) on the transceiver several

times to select the desired channel group. (p. 6)

r Push [Y] or [Z] to select a channel. (p. 5)

• When receiving a signal, “

” appears and audio is emitted

from the speaker.

• Further adjustment of [VOL] may be necessary.

t Push [HI/LO] on the microphone to select the output

power if necessary.

• “LOW” appears when low power is selected.
• Choose low power for short range communications, 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.

• “

” appears.

• Channel 70 cannot be used for transmission other than

DSC.

u Release [PTT] to receive.

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.

IMPORTANT: To maximize the readability of your trans-
mitted signal, pause a few sec. after pushing [PTT], hold
the microphone 2 to 4 inches (5 to 10 cm) from your mouth
and speak into the microphone at a normal voice level.

✔ NOTE for TOT (Time-out Timer) function
The TOT function inhibits continuous transmission over a pre-
set time period after the transmission starts.

Microphone