Nat SM41 User manual

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM41
NPX138
PANEL MOUNT RADIO
INSTALLATION AND OPERATION MANUAL
REV 4.00 November 10, 2003
Northern Airborne Technology Ltd.
1925 Kirschner Road
Kelowna BC, Canada
V1Y 4N7
Telephone [phone]
Facsimile [phone]
Copyright 2003 by Northern Airborne Technology

SM41 Rev. 4.00 NPX138 Panel Mount Radio Manual
Nov 10, 2003 Page ii
ENG-FORM: 820-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
IMPORTANT INFORMATION
FOR AVIONICS INSTALLATION FACILITIES
The NPX138 is supplied without TSO certification, as no such standard
presently exists for airborne VHF/FM radio transceivers. This
equipment provides what is considered as “supplemental”
communications, and can be installed in an aircraft on a “Non
interference” basis. Installation should be performed using standard
procedures applicable to aircraft radio installation, to ensure that the
newly installed equipment does not interfere with any other equipment
in the aircraft.
This device complies with Part 15 of the FCC Rules. Operation is
subject to the condition that this device does not cause harmful
interference.

SM41 Rev. 4.00 NPX138 Panel Mount Radio Manual
Nov 10, 2003 Page iii
ENG-FORM: 820-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Periodically NAT will release manual amendments. In order to maintain the most
accurate and up to date manual these amendments should be carried out immediately
upon receipt and recorded on the following amendment record.
AMENDMENT RECORD
Amendment
Number
Amendment
Date
Section(s)
Changed
Date
Entered
Entered By
1 Apr 19/04 2
2 Aug 19/04 2
3 Nov 22/04 2
4 Jun 10/05 1,3
Insert any Amendment Instruction sheets after this page.

INSTALL_OPS
MANUAL AMENDMENT
Manual: SM41 (NPX) Amendment #: 4
Document # SM41\Install_Ops\809-0004 Amendment Date: Jun 10, 2005
Amendment # 4 Jun 10, 2005 Page 1
ENG-FORM: 809-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
The purpose of this amendment is to add information relevant to the NPX138N-070.
Amendment Instructions:
1 Remove Pages Replace With Pages
1-5 Rev 4.00 1-5 Rev 4.00 Amendment # 4
3-3 and 3-4 Rev 4.00 3-3 and 3-4 Rev 4.00 Amendment # 4
3-7 and 3-8 Rev 4.00 3-7 and 3-8 Rev 4.00 Amendment # 4
3-11 and 3-12 Rev 4.00 3-11 and 3-12 Rev 4.00 Amendment # 4
3-19 Rev 4.00 3-19 Rev 4.00 Amendment # 4
2 Update the Amendment Record sheet at the front of the manual.
3 Insert this page into the manual after the Amendment Record sheet (page ii).
Manual Amendment ends after the following amended pages

INSTALL_OPS
MANUAL AMENDMENT
Manual: SM41 NPX138 Amendment #: 3
Document # SM41\Install_Ops\809-0003 Amendment Date: Nov 22, 2004
Amendment # 3 Nov 22, 2004 Page 1
ENG-FORM: 809-0107.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
The purpose of this amendment is to amend the cable and wiring specifications in line
with Transport Canada requirements.
Amendment Instructions:
Remove Pages Replace With Pages
1
2-1 and 2-2 Rev 4.00 2-1 and 2-2 Rev 4.00 Amendment #3
2 Update the Amendment Record sheet at the front of the manual.
3 Insert this page into the manual after the Amendment Record sheet (page ii).
Manual Amendment ends after the following amended pages

INSTALL_OPS
MANUAL AMENDMENT
Manual: SM41 NPX138 Amendment #: 2
Document # SM41\Install_Ops\809-0002 Amendment Date: Aug 19, 2004
Amendment #2 Aug 19, 2004 Page 1
ENG-FORM: 809-0107.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
The purpose of this amendment is to update the faceplate drawing.
Amendment Instructions:
Remove Pages Replace With Pages
1
2-5 2-5 Amendment #2
Remove Drawings (Section 2) Replace or add Drawings (Section 2)
2
NPX138\905-0 rev 1.40 NPX138\905-0 rev 1.50
Note: Ensure that all drawings are inserted in the order shown on the latest drawing lists.
3 Update the Amendment Record sheet at the front of the manual.
4 Insert this page into the manual after the Amendment Record sheet (page ii).
Manual Amendment ends after the following amended pages

MANUAL AMENDMENT
Manual: SM41 NPX138 Amendment #: 1
Document # SM41\Install_Ops\809-0001 Amendment Date: Apr 19, 2004
Amendment #1 Apr 19, 2004 Page 1
ENG-FORM: 809-0107.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
The purpose of this amendment is to include the new revision of the NPX138\634-0 in
the manual.
Amendment Instructions:
1 Remove Page Replace With Page
2-5 rev 4.00 2-5 rev 4.00 Amendment #1
2 Remove Drawings (Section 2) Replace or add Drawings (Section 2)
NPX138\634-0 rev 1.00 NPX138\634-0 rev 1.10
Note: Ensure that all drawings are inserted in the order shown on the latest drawing lists.
3 Update the Amendment Record sheet at the front of the manual.
4 Insert this page into the manual after the Amendment Record sheet (page ii).
Manual Amendment ends after the following amended pages

SM41 Rev. 4.00 NPX138 Panel Mount Radio Manual
Nov 10, 2003 Page iv
ENG-FORM: 820-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Table of Contents
Section Title Page
1.0 Description
1.1 Introduction 1-1
1.2 Purpose of Equipment 1-1
1.3 Features 1-1
1.4 Specifications 1-2
1.4.1 Electrical Specifications 1-2
1.4.2 Receiver 1-2
1.4.3 Transmitter 1-3
1.4.4 Physical Specifications 1-3
1.4.5 Environmental Specifications 1-4
1.5 Unit Nomenclature 1-4
1.5.1 Narrowband Capability 1-4
1.5.2 Options 1-4
1.5.3 Special Options 1-5
1.5.4 Voice Inversion Encryption 1-5
2.0 Installation
2.1 Introduction 2-1
2.2 Unpacking and Inspection 2-1
2.3 Installation Procedures 2-1
2.3.1 Warnings 2-1
2.3.2 Cautions 2-1
2.3.3 Notes 2-2
2.3.4 Cabling and Wiring 2-2
2.3.5 Antennas 2-3
2.3.6 Mechanical Mounting 2-4
2.3.7 Post-Installation Checks 2-4
2.3.8 Post Installation EMI Test 2-5
3.0 Operation
3.1 Introduction 3-1
3.2 Initial Operation 3-1
3.2.1 Power-up Help 3-1
3.2.2 Initial Operating Display 3-2
3.3 Display 3-2
3.4 Function Controls 3-3
3.4.1 Main RX (Receive) Volume Control 3-3

SM41 Rev. 4.00 NPX138 Panel Mount Radio Manual
Nov 10, 2003 Page v
ENG-FORM: 820-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
3.4.2 RX/TX Status Indicator 3-3
3.4.3 Scan/Guard TX Switch 3-4
3.4.4 Guard Controls 3-4
3.5 General Controls — Normal Operating Mode 3-5
3.5.1 Channel Switch 3-5
3.5.2 Brightness Switch 3-5
3.5.3 Squelch Pushbutton 3-6
3.6 Channel Display 3-6
3.6.1 ID Display Line 3-6
3.6.2 RX Display Line 3-7
3.6.3 TX Display Line 3-7
3.7 Channel Editing 3-8
3.7.1 SELECT Switch 3-9
3.7.2 NEXT Switch 3-9
3.7.3 EDIT Switch 3-10
3.7.4 HELP Switch 3-10
3.8 Status Editing 3-10
3.8.1 NEXT and SELECT Switch Use 3-11
3.8.2 Status Edit Features 3-11
3.9 Tones 3-12
3.9.1 General 3-12
3.9.2 Tone Display and Selection 3-13
3.9.3 Turning Tones On and Off 3-15
3.10 Scanning 3-15
3.10.1 General 3-15
3.10.2 Scan Operation 3-16
3.10.3 Scan Modes 3-16
3.11 Wideband/Narrowband Operation 3-18
3.11.1 Editing Wideband/Narrowband Flag 3-18
3.12 Configuration Mode 3-18
3.12.1 Using Configuration Mode 3-18
3.12.2 Configuration Option Table 3-19

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.

NPX138 Panel Mount Radio Manual SM41 Rev. 4.00
1.4 Specifications
1.4.1 Electrical Specifications
Input power 28 Vdc nominal
Current consumption 0.5 A receive/2.0 A transmit (typical)
0.8 A receive/3.0 A transmit (max.)
Panel lighting 28 Vdc, 14 Vdc or 5 Vdc dependent on model.
Sidetone output 25 mW @ 600 Ω, adjustable.
Microphone Amplified Dynamic or equivalent, 150 Ω
balanced/unbalanced
Frequency range 138.000 MHz to 173.995 MHz
Tone capability 38 standard CTCSS tones
Operating mode simplex or semi-duplex
1.4.2 Receiver
Channel increments 5 kHz/6.25 kHz
Audio output 100 mW @ 600 ΩBal/Unbal
Sensitivity
Main 0.5 µV max. @ 12 dB SINAD
Guard 0.5 µV max. @ 12 dB SINAD
Spurious response rejection 70 dB
Adjacent channel rejection
NPX138 (all models) 70 dB min. @ ± 25 kHz
NPX138N (all models)
Wideband 70 dB min. @ ± 25 kHz
Narrowband 60 dB min. @ ± 12.5 kHz
Intermodulation rejection 70 dB
Hum and Noise ratio
Unsquelched > 50 dB
Squelched < -80 dBw
Distortion < 4% @ rated output
Page 1-2 Nov 10, 2003
ENG-FORM: 800-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.