SM41 Rev. 4.00 NPX138 Panel Mount Radio ManualSection 3.0 Operation3.1 IntroductionIn addition to the general functions that are available on other FM radios, the NPX hasseveral features that extend its capability and make it easier to use. These featuresinclude alphanumeric channel labeling, built-in operator help, scanning, optional guardreceiver, and numerous others.For ease of use and operability, NAT uses the same control layout and operatingsystem in the NPX138 series of radios as it does in its popular Tac/Com family of radiocontrol heads.In addition to this manual, there is a help function built into the radio comprehensiveenough to address most operational questions.Many of the front panel controls have more than one function, dependent on theoperating mode of the radio. For this reason, they have multiple labels. When the radiois in ‘Normal’ mode (EDIT switch in the center ‘Off’ position), use the top label and whenthe radio is in ‘Edit’ mode (either ‘CH’ or ‘ST’), use the bottom label.3.2 Initial Operation3.2.1 Power-up HelpTurn the NPX on by rotating the main volume control clockwise, away from the ‘Off’detent position. The software revision number will briefly display, followed by a screenpresenting an option for use of the on-line Help system, as shown below.If you push the HELP button, the radio will present a tutorial on the operation of theradio. To advance through the tutorial, press HELP after reading each screen. To exitthis initial HELP function at any time, move the NEXT switch momentarily left or right.Nov 10, 2003 Page 3-1ENG-FORM: 806-0105.DOTCONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.