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Page 86 CPV550
18. BASIC RADIO OPERATION
18.0 RECEPTION
1. After the transceiver has been installed, ensure that the power supply and antenna are
properly connected.
2. Press and hold [PWR] until the display shows the chart page.
3. Turn [SQL] counterclockwise until the “BUSY” appears in the “VHF Radio” window on
the display.
4. Turn up [VOL] until noise or audio from the speaker is at a comfortable level.
5. Turn [SQL] clockwise until the random noise disappears. This state is known as the
“Squelch threshold.”
6. Turn the Channel knob to select the desired channel. Refer to the channel chart on page
133 for available channels.
7. When a message is received, adjust the volume to the desired listening level. “BUSY”
is displayed indicating that the channel is being used.
18.1 TRANSMISSION
1. Perform steps 1 through 6 of section “18.0 RECEPTION.”
2. Before transmitting, monitor the channel to ensure it is clear.
THIS IS AN FCC REQUIREMENT!
3. Press [PTT] on the microphone. “TX” indicator will appear in the “VHF Radio” window
on the display.
4. Speak slowly and clearly into the microphone.
5. When the transmission is finished, release [PTT].
NOTE
The CPV550 is supplied with a noise-canceling microphone. The oval slot labeled “MIC” should
be positioned within 1/2 inch (1.3 cm) from the mouth for optimum performance.
18.2 TRANSMIT TIME-OUT TIMER (TOT)
When the [PTT] on the microphone is held down, transmit time is limited to 5 minutes. This
limits unintentional transmissions due to a stuck microphone. About 10 seconds before
automatic transmitter shutdown, a warning beep will be heard from the speaker(s). The
transceiver will automatically go to receive mode, even if [PTT] is continually held down.
Before transmitting again, [PTT] must first be released and then pressed again.
18.3 SIMPLEX/DUPLEX CHANNEL USE
Refer to the VHF MARINE CHANNEL CHART (page 133) for instructions on use of simplex
and duplex channels.
NOTE
All channels are factory-programmed in accordance with International, Industry Canada (Canada),
and FCC (USA) regulations. Mode of operation cannot be altered from simplex to duplex or vice-
versa.