Nat NPX136D Series User manual

Northern Airborne Technology Ltd.
1925 Kirschner Road
Kelowna, BC, Canada.
V1Y 4N7
Telephone [phone]
Facsimile [phone]
Issued on the authority of Northern Airborne Technology Ltd.
Copyright 2008
Installation and Operation Manual
NPX136D Series VHF P25
Panel Mount Transceiver
SM68
ISSUE 4.01

NPX136D Series Panel Mount P25 VHF Transceiver
SM68 Installation and Operation Manual
Installation and Operation Manual Page iii
ENG-FORM: 820-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Table of Contents
Section Title Page
1. Description
1.1 Introduction 1-1
1.2 Product Description 1-1
1.3 Design Features 1-1
1.4 Specifications 1-1
1.4.1 Radio Specifications 1-1
1.4.2 Main Receiver 1-2
1.4.3 Guard Receiver (NPX136D-x70 only) 1-2
1.4.4 Transmitter 1-3
1.4.5 Physical Specifications 1-3
1.4.6 Environmental Specifications 1-4
1.5 Unit Nomenclature 1-4
1.5.1 Lighting Power 1-4
1.5.2 Special Options 1-4
1.5.3 Other Options 1-4
1.6 Accessories 1-5
2. Installation
2.1 Introduction 2-1
2.2 Unpacking and Inspection 2-1
2.2.1 Warranty 2-1
2.3 Continued Airworthiness 2-1
2.4 Installation Procedures 2-1
2.4.1 Note on Cable Routing 2-2
2.4.2 Notes on Cable Wiring and Shielding 2-2
2.4.3 Notes on Grounding 2-2
2.4.4 Cabling and Wiring 2-2
2.4.5 Antennas 2-3
2.4.6 Mechanical Mounting 2-4
2.4.7 Post-Installation Checks 2-4
2.4.8 Post Installation EMI Test 2-5
2.5 Accessories Required But Not Supplied 2-5
2.6 Installation Drawings 2-5

NPX136D Series Panel Mount P25 VHF Transceiver
SM68 Installation and Operation Manual
Installation and Operation Manual Page iv
ENG-FORM: 820-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Section Title Page
3. Operation
3.1 Introduction 3-1
3.2 General Information 3-1
3.3 Controls and Indicators 3-1
3.3.1 General Features 3-1
3.3.2 Power On 3-1
3.3.3 Controls and Indicators 3-3
3.4 Displays - Normal Operating Mode 3-6
3.4.1 Display Details 3-6
3.4.2 Changing channels on the main receiver 3-8
3.4.3 Changing zones on the main receiver 3-8
3.5 Menus and Settings 3-9
3.6 Settings Menu 3-10
3.6.1 Brightness 3-10
3.6.2 Transmit Power 3-10
3.6.3 Transmit Mode 3-10
3.6.4 Squelch Mode, Analog Tones 3-10
3.6.5 Squelch Mode, Receive Digital Squelch 3-11
3.6.6 Power Up Channel 3-11
3.6.7 Squelch Setting 3-11
3.6.8 Display Menu 3-11
3.7 Channel Menu 3-12
3.7.1 Edit Main Channel Menu (Edit Main) 3-12
3.7.2 Edit Guards (Edit Guard Channel) Menu (-070 only) 3-15
3.7.3 Edit Zone Menu 3-15
3.7.4 Edit Scan Menu 3-16
3.8 Maintenance Menu 3-17
3.8.1 Master Edit Mode 3-17
3.8.2 Configuration Menu 3-17
3.8.3 Data Transfer Menu 3-19
3.8.4 Software Version 3-20
3.9 Function Mode (Fn) 3-20
3.9.1 Call Menu for Analog Channels 3-20
3.9.2 Call Menu for Digital Channels 3-22
3.10 Scanning 3-22
3.11 CTCSS and CDCSS Tone Lists 3-23
3.11.1 CTCSS Tones 3-23
3.11.2 CDCSS Tone Codes 3-24
3.12 Error Messages 3-24

NPX136D Series Panel Mount P25 VHF Transceiver
SM68 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 4 Page 1-1
ENG-FORM: 800-0115.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Section 1 Description
1.1 Introduction
Information in this section consists of product description, design features and specifications for the NPX136D
Series Panel Mount P25 VHF Transceiver. All derivative product information shall be contained in the
applicable manual supplement, which may be obtained from Northern Airborne Technology Ltd. as required.
Review all notes, warnings and cautions.
1.2 Product Description
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.
1.3 Design Features
The radio 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 guard receiver is
standard with the -070 model.
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.
1.4 Specifications
1.4.1 Radio Specifications
+28Vdc Power Nominal: +27.5 Vdc
Maximum: +30.3 Vdc
Minimum: +22.0 Vdc
Emergency: +18.0 Vdc
Current (Under standard conditions) NPX136D-000 NPX136D-070
Idle: 330 mA (max.) 380 mA (max.)
Receive: 380 mA (max.) 430 mA (max.)
Transmit: 2.6 A (max.) 2.6 A (max.)
+28V Lights +28 Vdc, 300 mA (max.)
Frequency Range 136.000 – 173.9975 MHz
Operating Modes Project 25 and conventional Analog Simplex or Semi-Duplex

NPX136D Series Panel Mount P25 VHF Transceiver
SM68 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 4 Page 1-2
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Channels 255 max. Plus GD1 and GD2
Zones 16 max.
Sub-audible signalling CTCSS - 42 tones from 67.0 to 254.8 Hz
CDCSS - 83 data patterns
Remote Interface RS232C Data, to PC for Channel Loading and Firmware
Loading
RF Input/Output Impedance 50 ohms
Voice Digital Mode IMBE 4.4 kb
Frame Re-sync Interval 180 ms
Error Correction Algorithms RS / Golay / Hamming
Channel Increments 2.5 / 6.25 kHz
Channel Separation 12.5 / 25 kHz
Scan Capability 16 channels max. 1 home, 1 priority, 14 list.
Scan Rate 8 channels per second.
1.4.2 Main Receiver
Reference Sensitivity (12 dB SINAD) ≤-113 dBm
Reference Sensitivity (5% BER) ≤-113 dBm
Adjacent Channel Rejection ≥70 dB (25 kHz BW)
Spurious Response Rejection ≥70 dB
Intermodulation Rejection ≥70 dB
Audio Output Power 100 mW (600 ohms) rated
Audio Dynamic Range ≥37 dB
Audio Frequency Response 300 – 3000 Hz, Standard: EIA Std. -6 dB
(+1/-3 dB) / oct de-emphasis.
300 – 500 Hz, Standard with an additional
+6 dB/oct permitted.
2500 – 3000 Hz, Standard with an additional
-12 dB / oct permitted.
Audio Distortion 4% typical (10% max.)
Conducted Spurious Emissions ≤-57 dBm
FM Hum and Noise ≥34 dB (12.5 kHz BW)
≥40 dB (25 kHz BW)
≤-57 dBW squelched
1.4.3 Guard Receiver (NPX136D-x70 only)
All specifications are identical to the main receiver with the following exception.
Audio Output Power, minimum: 10 mW (adjustable)
Note: Main and Guard cannot be 455 kHz from each other due to 2nd IF interference

NPX136D Series Panel Mount P25 VHF Transceiver
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Section 1 Rev: 1.00 Issue 4 Page 1-3
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
1.4.4 Transmitter
Carrier Output Power 1 or 10 W ±1 dB
Time-out Timer 30-300 s (Factory Set to 60 s)
Duty Cycle 20% (1 min Tx, 4 min Rx.)
VSWR 20:1 (30 sec duration - undamaged)
Transmitter Stability into VSWR (3:1):
Spurious Output ≤-13 dBm
Rated Deviation ±5.0 kHz (25 kHz BW)
±2.5 kHz (12.5 kHz BW)
Carrier Frequency Stability ±2.5 ppm
Conducted Spurious Emissions ≤-20 dBm
Adjacent Channel Power ≤-70 dBc (25 kHz BW)
FM Hum and Noise ≥40 dB (25 kHz BW)
≥34 dB (12.5 kHz BW)
Microphone Input Impedance 150 Ω±20 %
Audio Frequency Response 300 – 3000 Hz, Standard: EIA Std. +6 dB
(+1/-3 dB) / oct pre-emphasis.
300 – 500 Hz, Standard with an additional +6 dB/oct
permitted.
2500 – 3000 Hz, Standard with an additional -6 dB / oct
permitted.
Audio Distortion 4% typical (10% max.)
Audio Input Sensitivity 100 mV rms (60% of rated deviation)
Sidetone Audio Level 25 mW (Adjustable)
Transmitter CTCSS Tone Deviation 475 ±125 Hz (12.5 kHz BW)
750 ±250 Hz (25 kHz BW)
Carrier Attack Time/Duration ≤100 ms
1.4.5 Physical Specifications
Height 2.65" (67.2 mm) max
Depth behind panel 7.02" (178.2 mm) not including connectors
Width 5.77" (146.6 mm), 4.97" behind panel
Weight 3.2 lbs. (max.)
Mounting Four standard Dzus-rail fasteners
Connectors One 25-pin male D-sub, with JVL locking hardware.
One 15-pin male D-sub, with JVL locking hardware
(reserved). One BNC female RF connector

NPX136D Series Panel Mount P25 VHF Transceiver
SM68 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 4 Page 1-4
1.4.6 Environmental Specifications
Temperature -30 C to +60 C
Altitude 50,000 feet
Humidity 95 %
Shock 6g (any axis)
RTCA/DO-160D Env. Cat. [(A4)(D1)]BAB(SBM)1XXXXXXZBABA[UUX]MXXXX
1.5 Unit Nomenclature
NPX136D radios are identified as follows:
NPX136D - 000
ENG-FORM: 800-0115.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Lighting Power Special Options
1.5.1 Lighting Power
The digit in the first position of the unit suffix indicates the lighting power used.
NPX136D - 000
0 = 28 Vdc Lights
1.5.2 Special Options
The digit in the second position of the unit suffix indicates any special options installed.
NPX136D - 000
0 = No Guard installed
7 = Two channel synthesized Guard
1.5.3 Other Options
The digit in the third position of the unit suffix is currently not assigned.
NPX136D - 000
1Vibration also qualified to DO-160C, Sec. 8, Cat. N.

NPX136D Series Panel Mount P25 VHF Transceiver
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Section 1 Rev: 1.00 Issue 4 Page 1-5
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
1.6 Accessories
Installation Kit NPX-IKC
Serial Load Kit FC51-000
Consists of:
PC Serial Load (CD) NUDP-006
Data Transfer Cable FC51-001
PC Cable FC47-001
TFM138 Harness to NPX FC45-002
Section 1 ends

NPX136D Series Panel Mount P25 VHF Transceiver
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Section 2 Rev: 1.00 Issue 4 Page 2-1
ENG-FORM: 805-0118.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Section 2 Installation
2.1 Introduction
Information in this section consists of unpacking and inspection procedures, installation procedures, post-
installation checks and installation drawings for the NPX136D Series Panel Mount P25 VHF Transceiver.
Review all notes, warnings and cautions.
2.2 Unpacking and Inspection
Unpack the equipment carefully and locate the warranty card. Inspect the unit visually for damage due to
shipping and report all such claims immediately to the carrier involved. Check that all items listed below
are present before proceeding and report any shortage immediately to your supplier:
- Warranty Card
- Operators Manual
- Certificate of Conformity or Release Certification
2.2.1 Warranty
All Northern Airborne Technology Ltd. products are warranted for 2 years from date of installation by an
authorized Northern Airborne Technology Ltd. dealer, to be free of defects in workmanship or
performance. This warranty covers all materials and labour, but is exclusive of any transport to deliver the
defective unit to and from Northern Airborne Technology Ltd. or its designated warranty repair center, or
any labour to remove or re-install the defective unit in the aircraft. Contact Northern Airborne Technology
Ltd. for any questions regarding this warranty, its applicability to your units and/or for return authorization.
Northern Airborne Technology Ltd. is the final arbitrator concerning warranty administration. Units which
have been physically damaged, burned, immersed in water or otherwise abused beyond the scope of
normal use will not be considered for warranty. WARRANTY IS VOID UNLESS THE PRODUCT IS
INSTALLED BY AN AUTHORIZED NORTHERN AIRBORNE TECHNOLOGY LTD. DEALER. Product
for which a warranty card is not returned shall be warranted from date of manufacture.
2.3 Continued Airworthiness
Maintenance of the NPX136D is ‘on condition’ only. Periodic maintenance of this product is not required.
2.4 Installation Procedures
Installation Notice
This product must be installed in accordance with the installation instructions provided in the latest issue
of this Installation and Operation Manual. Check the NAT Publication Index at www.northernairborne.com
for the issue status of the manual. The latest issue of the manual may be downloaded from the same
website. All risk associated with installation of this product contrary to these instructions shall be the
responsibility of the installing agency.

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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.1 Note on Cable Routing
Do not bundle any lines from this unit with transmitter coax lines. Do not bundle any logic, audio, or DC
power lines from this unit with 400 Hz synchro wiring or AC power lines. Do not position this unit next to
any device with a strong alternating magnetic field such as an inverter or significant interference
to operation will result. In all installations, use shielded cable exactly as shown and ground as
indicated. Significant problems may result if these guidelines are not followed.
2.4.2 Notes on Cable Wiring and Shielding
All audio installations can be severely degraded by incorrect wiring and shielding, and may result in much
higher cross-talk, hum, and ground-loop interference. This should be considered when audio wiring to
and from the radio installation is performed.
2.4.3 Notes on Grounding
The case of the radio must be electrically grounded for maximum resistance to low frequency
interference. A pin on the connector (Chassis ground) is provided and must be connected by a short wire
to a clean ground, NOT jumpered to the power ground wire connection.
Refer to the aircraft structural repair manual and maintenance manual for instructions and information
pertinent to this installation.
2.4.4 Cabling and Wiring
All wire shall be selected in accordance with the original aircraft manufacturer's Maintenance Instructions
or AC43.13-1B Change 1, Paragraphs 11-76 through 11-78. Unshielded wire types shall qualify to
MIL-W-22759 as specified in AC43.13-1B Change 1, Paragraphs 11-85, 11-86, and listed in Table 11-11.
For shielded wire applications, use Tefzel MIL-C-27500 shielded wire with solder sleeves (for shield
terminations) to make the most compact and easily terminated interconnect. Follow the connector map in
Section 2.6 as required.
Coaxial cable shall be selected in accordance with MIL-C-17 unless otherwise specified. Do not use coax
cable with PVC insulation. Teflon dielectric cable is encouraged at or above VHF frequencies or where
cable runs exceed 8 feet. Note that at VHF frequencies, cables losses due to long cable runs and tight
bends may reduce the ERP (Effective Radiated Power) by greater than 50%.
Allow 3" from the end of the shielded wiring to the shield termination to allow the connector hood to be
easily installed. Reference the interconnect drawing in Section 2.6 for shield termination details. Note that
the hood is a "clamshell" hood, and is installed after the wiring is complete. Installation cabling must allow
the radio to be easily withdrawn for disconnection and field service adjustments. Ensure an adequate
service loop in the routing of the cables. It can be a serious issue if the unit is installed with the cables so
short that the unit cannot be removed without disassembly of the surrounding structures. At least 30 cm
(1 foot) of free cable is recommended.
Maintain wire segregation and route wiring in accordance with the original aircraft manufacturers
Maintenance Instructions. Fabrication & installation of wiring harness should be in accordance with the
original aircraft manufacturer’s Maintenance Instructions or AC 43.13-1B Change 1, chapter 11, sections 5
to 13, 16 and 17. Coaxial cables shall be routed separately from existing wire bundles in the aircraft to
minimize electromagnetic coupling effects. To prevent RF interference between similar systems, it is

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Section 2 Rev: 1.00 Issue 4 Page 2-3
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
recommended that VHF FM coax runs be widely separated, or be made using triaxial cable, with the outer
shield bonded to the airframe at one end only (transceiver end). In communication-intensive applications,
poor cable routing and shielding may drastically compromise over-all system performance. Symptoms may
be spurious squelch opening, RFI (Radio-Frequency Interference), and garbled reception.
RF cables must be neatly terminated (solder or crimp), and tested for shorts prior to system check-out
(not while connected to the radio or antenna). Keep cable bends to a minimum at the antenna. Avoid
sharp bends in the coax cables (minimum 3" radius) to prevent severe reflections. If sharp bends are
required, use 90°elbow adapters.
Unless otherwise noted, all wiring shall be a minimum of 22 AWG, except power and ground lines, which
shall be a minimum of 20 AWG. Reference the Interconnect drawing for additional specifications. Check
that the ground connection is clean and well secured, and that it shares no path with any electrically noisy
aircraft accessories such as blowers, turn and bank instruments or similar loads. Power to this unit must
be supplied from a separate circuit breaker or fuse (fast blow), and not attached to any other circuit
breaker without additional protection. Verify that the selected circuit breaker size and wire gauge are
adequate for the installation using the techniques specified in AC43.13-1B Change 1, Paragraphs 11-47
through 11-51 and 11-66 through 11-69.
Grounding and bonding should be in accordance with the original aircraft manufacturers Maintenance
Instructions or AC 43.13-1B Change 1, chapter 11, section 15.
2.4.5 Antennas
WARNING:
To limit exposure to radio frequency fields that exceed exposure limits for
people occupying the aircraft, install the antenna such that it is mounted either
on a ground plane that is between the antenna and the occupants of the aircraft,
or further than 32 inches (80cm) from the occupants of the aircraft.
Correct antenna placement and mounting is critical in order to achieve the best possible performance. In
general, keep all antennas as widely separated as possible and clear of any large airframe obstructions.
Installation of the antenna should be in accordance with the aircraft manufacturer’s instructions for
continued airworthiness or AC 43.13-1B Change 1, chapter 11, section 15 and AC 43.13-2A chapter 3. If
possible, the antenna should be located a minimum of 12 ft from aircraft navigation receiver antennas and
a minimum of 4 feet from aircraft communications and ELT antennas. Be careful not to choose
separations that closely approximate ¼, ½ or whole-number multiples of the navigation or
communications system wavelength.
Note: Avoid any placement that puts antennas of like frequencies close together.
Bottom mounted antennas will perform best in flight, but poorest on the ground during testing. Antennas
may be severely degraded by 'masking' effects of the fuselage or stabilizers, and generally give best
performance when bottom mounted.
To reduce interference from rotor modulation and other undesirable stimuli, any blade or whip antenna must
be surrounded by a ground plane surface (metallic, grounded material) with a radius equal to or greater than
the height of the antenna. Under the same conditions, the antenna is also much less likely to cause
interference to other aircraft systems (e.g. coupling into audio system, fluctuations in instrumentation, etc).
Poor grounding will result in severe reflected power and high levels of RFI throughout the airframe.

NPX136D Series Panel Mount P25 VHF Transceiver
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Section 2 Rev: 1.00 Issue 4 Page 2-4
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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Avoid antenna locations that will become fouled with oil, water, fuel or dirt, as this will degrade
performance. Roof mounts (in close proximity to rotor blades) are permissible.
2.4.6 Mechanical Mounting
Installation of the transceiver should be in accordance with the aircraft manufacturer’s instructions for
continued airworthiness or AC 43.13-1B Change 1, chapter 7, sections 2 to 7 and AC 43.13-2A, chapter 2.
Pr 35 Dzus rail or equivalent may be used.
Mounting the radio requires a Dzus rail assembly with an opening width of 5 inches (127 mm) and a front
clearance width of 5.75 inches (146.1 mm). Height requirement is 2.65" max (67.2 mm max). Refer to the
mounting drawings and unit mechanical specifications to determine proper clearance dimensions. Be
sure that adequate clearance is allowed for the cable connections to each unit.
2.4.7 Post-Installation Checks
2.4.7.1 Voltage/resistance checks
Do not attach the radio until the following conditions are met.
Check the following:
a) P1 pins <12> and <13> for +28 Vdc relative to ground.
b) P1 pins <22>, <23>, <24> and <25> for continuity to ground (below 0.5 Ω).
c) Light voltage as per table below.
Light Voltage P1 Pin # Voltage
28 Volt Models 11 28 Vdc
14 Volt Models 10 14 Vdc
5 Volt Models 10 5 Vdc
Ensure that the antenna is disconnected for the following test or erroneous readings may be obtained.
d) Radio coax connector for continuity to the antenna coax connector (shield and centre conductor),
and for open circuit from the centre conductor to ground and open circuit from the centre
conductor to the shield.
2.4.7.2 Power On Checks
a) Install the radio and power up the ship’s systems. Turn on the radio. Check the operation of all front
panel controls. Adjust brightness and volume levels as required.
b) Check all transmit and receive functions. Ensure the RX/TX status indicator lights green when the
radio is keyed to transmit and amber when receiving.
c) Check the SCAN function.
Note: You may be unable to hear the received audio if the tones do not match those set in the
radio. To avoid any confusion, tones should be set to OFF (via the settings menu) before
scanning so that all channels will be heard.

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d) Check the antenna feedline at the R/T with a through-line wattmeter and suitable frequency
elements to ensure correct antenna matching. Reflected power in excess of 25% represents a
serious problem, and should be investigated carefully, or serious RFI and system interference as
well as possible radio damage may result. A VSWR measurement over 3.0:1 represents a
significant loss in signal power to the antenna. Check that forward power is to specifications over
the frequency band of the radio.
Upon satisfactory completion of all performance checks, make all required log book entries, electrical
load, weight and balance amendments and other documentation as required by your local regulatory
agency before releasing the aircraft for service.
2.4.8 Post Installation EMI Test
The purpose of this test is to identify any interference that the radio may cause with existing aircraft
systems. The radio should be tested in accordance with the Installation Approval Test Procedure (see
section 2.6), and the test results documented on the record sheets.
2.5 Accessories Required But Not Supplied
Installation kit p/n NPX-IKC (crimp) is required to complete the installation. The kit consists of the following:
Quantity Description NAT Part #
1 D-min 25 Pin Female Crimp Installation Kit D25SV-IKC
1 Field Serviceable BNC Coax Connector 20-51-001
The NAT Part D25SV-IKC Crimp Installation Kit consists of:
Quantity Description NAT Part #
1 D-min 25 Socket housing 20-21-025
25 MS Crimp Socket 20-26-901
1 25 pin JVL Hood/Locklever 20-29-250
2.6 Installation Drawings
DOCUMENT REV. DESCRIPTION TYPE SERIAL NO.
NPX136D\403-0 1.10 Panel Mount Transceiver Interconnect (2 sheets) All
NPX136D\405-0 1.00 Panel Mount Transceiver Connector Map All
NPX136D\634-0 1.00 Panel Mount Radio Installation Approval Test Procedure All
NPX136D\905-0 1.01 Panel Mount Transceiver Faceplate All
NPX136D\922-0 1.00 Panel Mount Transceiver Mechanical Installation All
Section 2 ends following the above documents

INSTALLATION APPROVAL
TEST PROCEDURE
NAT Part #: NPX136D Description: Panel Mount Radio
Document #: NPX136D\634-0 Rev: 1.00
Rev. 1.00 Apr 22, 2004 Page 1 of 7
ENG-FORM: 634-0100.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
1. Post Installation EMI Test
The purpose of this test is to identify any interference that the NPX136D may cause with
existing aircraft systems.
2. Test Conditions
The NPX136D should be installed and function tested. The antenna VSWR should be
checked. A forward/reverse power check with an in-line wattmeter should show no
more than 10% reflected power. For the following tests, insure that the transmit power
is set to HI.
3. Methodology
Most of the EMI tests can be accomplished on the ground. In some cases, flight testing is
required or is easier. If the aircraft is approved for IFR operations, then it is mandatory
that interference between the NPX136D and the approach aids be checked in flight.
The GPS should be operational and navigating with at least the minimum compliment of
satellites. The VHF comm should be set to the frequencies indicated with the squelch open.
VOR/ILS/GS receivers should be set to the frequencies indicated and selected for display. If
possible, set up a VOR/ILS ramp test set on the frequencies indicated and adjust the output
until the flags are out of view. The transponder and encoder should be monitored with ramp
test equipment. If possible set the ADF to a nearby navigation station.
Modulate the NPX136D transmitter on the indicated frequencies for at least 20 seconds.
Observe the GPS for any degradation in satellite status or availability or flags. Listen for
any noise or detected audio signals on the VHF comm(s). Listen for any noise or
detected audio signals on the VOR/LOC receiver audio; look for any movement of flags
or needles on the VOR/LOC/GS navigation display(s).
List the power plant, fuel and other electric instruments in the chart provided and note
any anomalies that occur while transmitting. Assess the results.
If the aircraft is equipped with an autopilot or a stability augmentation system, then test
fly the aircraft and verify that the operation of the NPX136D transceiver does not have
adverse effects on these systems. After checking for gross effects at a safe altitude, fly
an approach with each of the different navigation systems coupled to the autopilot (ILS,
GPS etc.) and look for any anomalies.

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4. Results
If the installed system passes all of the applicable EMI tests, then no further action is
required. If interference is observed, then the interference must be assessed against
the appropriate standards of airworthiness for the system in question. For example: it is
permissible for a VFR certified GPS to lose navigation capability while the NPX136D is
transmitting, providing that it recovers properly and promptly, but it is not permissible for
an IFR Approach certified GPS to be affected in the same way. A complete discussion
of all the standards of airworthiness to be applied in assessing EMI effects is beyond
the scope of this document.
5. Procedure
A. Operate the NPX136D transmitter on the following frequencies for at least 20
seconds. Observe the GPS for any degradation in satellite status, or availability, or
flags.
FREQUENCIES GPS #1 GPS #2
NPX136D PASS FAIL PASS FAIL
143.2187 MHz
143.2200 MHz
153.4500 MHz
157.5400 MHz
157.5437 MHz
NOTES:

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CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
B. Determine if the image frequency for the VHF Comm falls within the range of the
NPX136D unit. If so, select a set of frequencies that will cause the NPX136D to
be set as close as possible to the image frequency. Any one of the many
possible sets will suffice. Record these values in the spaces provided in the
following chart. Modulate the NPX136D transmitter on the following frequencies
for at least 20 seconds. Listen for any noise or detected audio signals on the
VHF comm.
Example - Bendix/King KY 196A:
The first IF frequency is 11.4 MHz. The L.O. is above the received frequency
(high side injection), therefore the image frequency is 22.8 MHz above the
selected frequency. Set the KY 196A to 120.000 MHz and the NPX136D to
142.8000 MHz.
FREQUENCIES RESULTS
VHF #1 NPX136D PASS FAIL
135.975 138.0000
121.150 157.5000
131.250 157.5000
Image:
FREQUENCIES RESULTS
VHF #2 NPX136D PASS FAIL
135.975 138.0000
121.150 157.5000
131.250 157.5000
Image:
NOTES: