Reception; Transmission - Furuno FM-4721 Operator's Manual

2.2

Reception

1. After the transceiver has been installed, ensure that the power supply and anten-
na are properly connected.
2. Press and hold the PWR key until the radio turns on.
3. Rotate the SQL knob fully counterclockwise. This state is known as "squelch off".
4. Rotate the VOL knob clockwise until noise or audio from the speaker is at a com-
fortable level.
5. Rotate the SQL knob clockwise until the random noise just disappears. This state
is known as the "squelch threshold".
6. Rotate the CH knob to select a channel. Refer to the channel chart in the Appendix
for available channels.
7. The numeric keys on the front panel may be used to directly select channels.
For example, to select CH68:
1) Press the 6/DW key.
2) Press the 8/PA key.
3) Press the ENT key.
In the USA and Canadian modes, press and hold down the 0 key to select the "A"
channel. For example, to select CH22A:
1) Press the 2/MEM key.
2) Press the 2/MEM key.
3) Press the 0 key until "A" appears to the right of the channel number.
4) Press the ENT key.
8. When a message is received, adjust the volume to the
desired listening level. The
display indicates communications is being received.
2.3

Transmission

1. Do steps 1 through 6 in section 2.2 "Reception".
2. Before transmitting, monitor the channel to ensure it is
clear.
3. Press the PTT (push-to-talk) switch on the micro-
phone. The
4. Speak slowly and clearly into the microphone.
5. When the transmission is finished, release the PTT switch.
Note: This is a noise-canceling microphone. Position the slot labeled "MIC" within 1.5
cm from your mouth for optimum performance.
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indicator on the
indicator appears on the display.
2. OPERATION
2-5