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Uniden MHS450 Radio Owner’s Manual
Note:
You cannot transmit on the weather frequencies. They are
designated ‘receive’ only. An error tones sounds when you
press the PTT switch and a weather channel is selected.
The displayed weather channel number ashes, and
RELEASE PTT KEY is displayed to remind you that you
cannot transmit on the selected channel.
You cannot transmit on channel 70, and 15 in the USA.
“Channel 70 is reserved for digital data only while channel
15 is reserved for receive only.” If you attempt to transmit,
you see RELEASE PTT KEY on the bottom of the screen.
Do not hold down the PTT switch while turning on the
radio. An error tone sounds and the same message
appears.
Pressing PTT disables Scanning, TripleWatch checking
and DualWatch checking. If the channel has no carrier, the
rst press of PTT takes the radio out of scan mode. Press
PTT to activate transmitting.
Continuous transmitting is limited to 5 minutes by
regulations. After this time, an error tone sounds and
RELEASE PTT KEY displays. After you release PTT,
pressing PTT restarts the 5-minute time interval again.
Using the Radio Menu Options
The MHS450 lets you select options that personalize your
use of the radio and makes using it more convenient.
Press MENU to access the multi-choice radio menu. RADIO
MENU appears at the top of the screen. Press MENU again
to return to the default marine mode or use ▲ or ▼ to move
and highlight the desired menu option.
Note: if during any of the following operations you fail to
press a key or make a selection in more than 30 seconds,
the radio returns to standard marine mode.
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