NPX136D Series Panel Mount P25 VHF Transceiver
SM68 Installation and Operation Manual
Section 3 Rev: 1.00 Issue
4
Page 3-1
ENG-FORM: 806-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Section 3 Operation
3.1
Introduction
Information in this section consists of the functional and operational procedures for the NPX136D-000
and NPX136D-070 Panel Mount P25 VHF Transceivers.
3.2
General Information
The NPX136D Panel Mount P25 VHF transceiver is a stand-alone radio designed for the single mission
user. It provides all the features needed to satisfy communications within the VHF high band.
The NPX136D incorporates NAT’s proven user-friendly operating system with on-line help, making it
easy to program and use. The small size makes this radio ideal for airframes where size and weight are
a factor.
The NPX136D covers a frequency range of 136.0000 to 173.9975 MHz in 2.5/6.25 kHz increments.
Each of the 255 available channels can operate in one of three modes: wide band analog, narrow band
analog or digital P25 Phase I.
A SCAN function allows scanning of selected channels. Transmit power of either 1 watt or 10 watts is
selectable from the front panel. Simplex and semi-duplex operations are available. A separate two-
channel guard receiver is standard with the -070 model. The guard receiver is not installed in –000
models, and the guard controls in these transceivers provide no function.
Conveniently located beside the display are separate main volume, guard volume and transmit select
switches. Easily identified along the bottom of the front panel are squelch test, channel up/down and
display controls. The aircraft dimmer bus provides control for the panel lighting.
3.3
Controls and Indicators
3.3.1 General
Features
In addition to the general features that are available, the NPX136D has several features that extend its
capability and make it easier to use. These features include alphanumeric channel labelling, and built-in
operator help.
For ease of use and operability, the NPX136D series of radios uses a control layout and operating system
similar to the popular Northern Airborne Technology Tac/Com™ family of radio control heads.
In addition to this manual, most operational questions can be addressed by the comprehensive Help
function built into the radio.
3.3.2 Power
On
3.3.2.1 Power-up
Screen
Turn the NPX136D on by rotating the main (MN) volume control clockwise, away from the off (detent)
position. The software revision number is shown briefly on the top display line and the status of the
installed transceiver modules is shown on the lower display line. If enabled, the operator is able to choose
between starting normal operation or being shown a tutorial on the operation of the radio.
