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12 Northstar Explorer VHF Series: 721US, 721EU Operation and Installation Manual
info Information. Press on the base MIKE to toggle through the INFO display to show
the barometric historgram, the barometric readout and temperature, or the Signal-
to-Noise Ratio (SNR).
H/L Transmission Power. High (HI) 25 W or Low (LO) 1 W. Press to toggle between high
or low transmission power for the entire channel bank. The HI or LO selection is
shown on the LCD.
Some channels allow only low power transmissions. Error beeps will sound if the
power transmission setting is incorrect.
Some channels allow only low power transmissions initially, but can be changed
to high power by holding down H/L and PTT at the same time. See Appendix C for
a complete listing of channel charts.
+ CH - Channel Select. Press CH + or CH - to step through the available channels one at a
time, or hold down to scroll rapidly through all the available channels. The current
channel is shown on the LCD in BIG digits with an A or B designator suffi x (if ap-
plicable) in small letters below the channel number. (See Appendix C for a listing
of channel frequencies.)
Press CH + or CH - to scroll the cursor up and down menu options on the LCD when
navigating menus.
When editing an item containing only numbers, press CH - to step through the
numbers or hold down to scroll rapidly.
To enter a character, press Ch = to step through the alphabet or hold down to scroll
rapidly.
ENT Enter. Press ENT when navigating menus, to confi rm entries and edits.
PTT Press To Talk. Press PTT to transmit at any time on an allowable channel. This auto-
matically exits you from menu mode and stops scanning.
You must release PTT to receive a signal.
If PTT sticks, a built-in timer will automatically shut down a transmission after fi ve
minutes and sound the error beeps. This timer is required by FCC regulations.