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 flashes, 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 first 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
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
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.
28 | Uniden MHS450 Radio Owner’s Manual |