Wulfsberg Electronics Division NPX136D VHF Transceiver User Manual 805 0

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Document ID	417978
Application ID	EP1H+IHPdXMwY2ODFGffeQ==
Document Description	Installation Manual
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	1.58kB (19778 bits)
Date Submitted	2004-04-27 00:00:00
Date Available	2004-04-27 00:00:00
Creation Date	2004-04-26 09:55:10
Producing Software	Acrobat PDFWriter 5.0 for Windows NT
Document Lastmod	0000-00-00 00:00:00
Document Title	805-0.doc
Document Creator	805-0.doc - Microsoft Word
Document Author:	Scottm

SMtbd Rev. 0.01
NPX136D Panel Mount Radio Manual
Section 2.0 Installation
2.1
Introduction
PRELIMINARY
Information in this section consists of: unpacking and inspection procedures, installation
procedures, post-installation checks, and installation drawings.
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.
Note that each unit should have the following:
- NPX136D Radio
- Warranty Card
- Operator’s Manual
- Release certification
Verify that all items are present before proceeding, and report any shortage immediately to
your supplier.
Complete the warranty card information, and send it to NAT when the installation is
complete. If you fail to complete the warranty card, the warranty will be activated on date of
shipment from NAT.
2.3
Installation Procedures
2.3.1
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.
2.3.2
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.
Apr 23, 2004
Page 2-1
ENG-FORM: 805-0104.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
NPX136D Panel Mount Radio Manual
2.3.3
SMtbd Rev. 0.01
Notes on Grounding
The case of the NPX136D 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.
2.3.4
Cable and Wiring
All wire should be in accordance with MIL -W-22759 unless otherwise specified. All cable
should be in accordance with MIL -C-27500 unless otherwise specified. Use solder sleeves
(for shielded terminations) to make the most compact and easy to terminate interconnect.
Follow the wiring diagrams in Section 2.5 as required.
Allow 3 inches from the end of the wire to the shield termination to allow the hood to be
easily installed. Note that the hood is installed after the wiring is complete.
Installation cabling must allow the NPX136D 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.
All wiring should be 22 AWG minimum, except power and ground connections, which must
be 20 AWG or larger, as indicated on the installation drawings. Ensure that the ground
connection is clean and well secured. To prevent inadvertent system failure, power to this
system must be supplied from a separate breaker or fuse and not connected to any other
device. A 5 A fuse or breaker is recommended (28 Vdc).
Coaxial cable should be in accordance with MIL -C-17 unless otherwise specified. Do not
use coax 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, cable
losses due to long cable runs and tight bends may cut the ERP (Equivalent Radiated
Power) to less than 50% of spec.
To prevent RF interference between similar systems, it is 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.
Page 2-2
April 26, 2004
ENG-FORM: 805-0104.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SMtbd Rev. 0.01
NPX136D Panel Mount Radio Manual
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.
Fabrication & installation of wiring harness should be in accordance with AC 43.13-1A
chapter 11, sections 3 and 7.
Grounding and bonding should be in accordance with AC 43.13-1A chapter 11, section 3.
2.3.5
Antennas
Warning:
To limit exposure from radio frequency fields that exceed exposure limits for people
occupying the aircraft, install the antenna such that it is mounted;
on a ground plane that is between the antenna and the occupants of the aircraft, or
farther 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 AC 43.13-1A chapter 2, section 3,
chapters 5 & 6, 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.
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.
Apr 23, 2004
Page 2-3
ENG-FORM: 805-0104.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
NPX136D Panel Mount Radio Manual
2.3.6
SMtbd Rev. 0.01
Mechanical Mounting
Installation of the transceiver should be in accordance with AC 43.13-1A chapter 2, section
3, and AC 43.13-2A, chapter 2. Pr 35 Dzus rail or equivalent may be used.
Mounting the NPX136D requires a Dzus rail assembly with an opening width of 127 mm (5
inches) and a front clearance width of 146.1 mm (5.75 inches). Height requirement is tbd
mm (tbd inches). 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.
2.3.7
Post-Installation Checks
2.3.7.1
Voltage/resistance checks
Do not attach the NPX136D until the following conditions are met.
Check the following:
a)
P101 pins <12> and <13> for +28 Vdc relative to ground.
b)
P101 pins <22>, <23>, <24> and <25> for continuity to ground (below 0.5 Ω).
c)
Light voltage as per table below.
28 Volt Models
14 Volt Models
5 Volt Models
P101 Pin #
11
10
10
Voltage
28 Vdc
14 Vdc
5 Vdc
Light Voltage
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
center conductor), and for open circuit from the center conductor to ground and
open circuit from the center conductor to the shield.
Page 2-4
April 26, 2004
ENG-FORM: 805-0104.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SMtbd Rev. 0.01
2.3.7.2
NPX136D Panel Mount Radio Manual
Power On Checks
a)
Install the NPX136D 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.
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.
2.3.8
Post Installation EMI Test
The purpose of this test is to identify any interference that the NPX136D may cause with
existing aircraft systems. The NPX136D should be tested in accordance with the
Installation Approval Test Procedure (see section 2.5), and the test results documented on
the record sheets.
2.4
Continued Airworthiness
Maintenance of the NPX136D is ‘on condition’ only. Periodic maintenance of these
products is not required.
2.5
Installation Drawings
DRAWING
REV.
DESCRIPTION
TYPE
NPX136D\403-0
1.00
Panel Mount Radio
NPX136D\403-1
1.00
Panel Mount Radio
Interconnect
NPX136D \405-0
1.00
Panel Mount Radio
Connector Map
NPX136D\905-0
1.00
Panel Mount Radio
Faceplate
NPX136D\922-0
1.00
Panel Mount Radio
Mechanical
NPX136D\634-0
1.00
Post Installation EMI Test
Interconnect
Installation Approval Test Procedure
Section 2.0 ends after these Drawings
Apr 23, 2004
Page 2-5
ENG-FORM: 805-0104.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.

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Title                           : 805-0.doc
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