Receiving And Transmitting - Icom IC-M504A Instruction Manual

Vhf marine transceiver
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3
BASIC OPERATION

Receiving and transmitting

CAUTION: Transmitting without an antenna will damage
the transceiver.
q Push [POWER] to turn ON the power.
w Set the audio and squelch levels.
Rotate [SQL] fully counterclockwise first.
Rotate [VOL] to adjust the audio output level.
Rotate [SQL] clockwise until the noise disappears.
e While holding down [H/L], push
one or more times to change the channel group. (p. 7)
r Rotate [DIAL] to select a channel. (pp. 6, 7)
selects a channel.
from the speaker.
t Push
function ON or OFF, if necessary.
LOC" appears when the receive Attenuator function is ON.
y Push [H/L] to select the output power if necessary.
25W" or "1W" appears when high or low power is selected, re-
spectively.
power for longer distance communications.
u Hold down [PTT] to transmit, then speak into the micro-
phone at your normal voice level.
TX" appears.
i Release [PTT] to receive.
8
[Y]/[Z] on the microphone, also
BUSY" appears and audio is emitted
[VOL] may be necessary.
to turn the receive Attenuator
Simplex channels, 3, 21, 23, 61, 64, 81, 82 and 83 CANNOT
be lawfully used by the general public in U.S.A. waters.
IMPORTANT: To maximize the readability of your transmit-
ted signal, pause a few seconds after pushing [PTT], hold
the microphone 2 to 4 inches (5 to 10 cm) from your mouth
and speak at a normal voice level.
y
q
w
w
e
r
NOTE for TOT (Time-out Timer) function
The TOT function inhibits continuous transmission over a pre-
set time period after the transmission starts.
10 seconds before the TOT function activates, a beep sounds
to indicate the transmission will be shut down and "TOT" ap-
pears on the channel comment indicator. Transmission is not
possible for 10 seconds after this transmission shut down.
u
i
Microphone
t
r
e y

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