Northern Airborne Technology NPX138 - Manual (Page 13)

SM41 Rev. 4.00 NPX138 Panel Mount Radio Manual
Section 1.0 Description
1.1 Introduction
This manual contains description, installation, operation and maintenance information
on the NPX138 series of panel mount FM transceivers, serial numbers 1238 and
subsequent.
The NPX138 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.
1.2 Purpose of Equipment
The NPX138 panel mount FM transceiver is a stand-alone radio designed for the single
mission user. It provides all the features needed to satisfy FM communications within
the VHF-FM high band.
1.3 Features
The NPX138 covers a frequency range of 138.000 MHz to 173.995 MHz in 5.0/6.25
kHz increments. Each of the 100 available channels can include a receive frequency
and CTCSS tone, transmit frequency and CTCSS tone, and an alpha/numeric
identifier.
A SCAN function allows scanning of selected channels. Transmit power of either 1 watt
or 10 watts is selectable from the front of the NPX138. Simplex and semi-duplex
operations are available. An optional guard receiver is available with some models.
DTMF encoding and direct keyboard entry can be effected by the use of the DTE12, an
accessory available from NAT.
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 brightness controls. The aircraft dimmer
buss provides control for the panel lighting.
Depending on model selected the NPX138 can provide wideband (± 5.0 kHz Rated
System Deviation) and/or narrowband (± 2.5 kHz Rated System Deviation) by channel.
Compensation circuitry ensures that the average receive audio level remains constant
when the mode changes.
Nov 10, 2003 Page 1-1
ENG-FORM: 800-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.