Chapter 2: Operation
18 VHF radio communication
Engagement status
The radio is engaged when an active DSC-initiated communication is ongoing,
or communication is active on non-DSC initiated VHF operation:
• A new channel selected
• PTT pressed or,
• Voice signal received
The engagement state is used to prohibit incoming DSC calls from taking over
control of the transmitter channel, disrupting ongoing communication.
When the radio is engaged in VHF communication not initiated by DSC, this is
indicated with the tab in the display. Engagement will automatically
time-out on inactivity (in the absence of any of the listed events above), and
after an inactivity time specified in DSC setup on page 42.
To terminate the engagement immediately press the soft key QUIT.
Reduced transmission power LO
Press the key 1W to toggle the transmit power between low (1 W, LO is
displayed) and high (25 W).
US channels: Local mode, 10 dB attenuation
Press the soft key LOCAL to add 10 dB attenuation. If LOCAL is not in the
display, press the soft key MORE until LOCAL appears in the display.
Local mode is automatically exited when using channel 16. If you
want to use attenuation on channel 16 or a call channel, you must
set it manually each time.
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