Wulfsberg Electronics Division NTX403 NTX403 UHF FM Transceiver User Manual Section 2 0 Installation

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Document ID	316818
Application ID	ABRgfbFublNMHmFll60++Q==
Document Description	Installation instructions
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	9.66kB (120727 bits)
Date Submitted	2003-04-09 00:00:00
Date Available	2003-05-30 00:00:00
Creation Date	2003-04-09 13:02:52
Producing Software	Acrobat Distiller 5.0 (Windows)
Document Lastmod	2003-04-09 11:20:16
Document Title	Section 2.0 Installation
Document Creator	Acrobat PDFMaker 5.0 for Word
Document Author:	Margaret Brunsden

SM28 Rev. 2.10
NTX Series Remote Mount FM Transceivers Manual
Section 2.0 Installation
2.1
Introduction
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:
- NTX Series Transceiver
- Warranty Card
- 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
Warnings
← IMPORTANT!
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.
Oct 25, 2002
Page 2-1
ENG-FORM: 805-0104.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
NTX Series Remote Mount FM Transceivers Manual
2.3.2
SM28 Rev. 2.10
Cautions
Severe degradation of audio installations may result from incorrect wiring and shielding.
This could cause much higher cross-talk, hum, and ground-loop interference.
2.3.3
Notes
For maximum resistance to low frequency interference, electrically ground the case of
the NTX Series Transceiver.
2.3.4
Cable and Wiring
All wires should be in accordance with MIL-W-22759 unless otherwise specified. All
cables 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 interconnects. Follow the wiring diagrams in Section 2.5 as required.
To provide easy installation of the hood, allow 3 inches from the end of the wire to the
shield termination. Note: Install the hood after the wiring is complete.
Installation cabling must allow the NTX Series transceiver to be easily withdrawn for
disconnection and field service adjustments. Ensure an adequate service loop in the
routing of the cables.
All wiring should be 22 AWG, except power and ground connections, which must be
18 AWG or larger, as indicated on the installation drawings. Ensure that the ground
connection is clean and well secured. To prevent inadvertent system failure, supply
power to this system from a separate breaker or fuse not connected to any other
device. NAT recommends a 5 A fuse or breaker (28 Vdc Source).
Coaxial cable should be in accordance with MIL-C-17 unless otherwise specified. Do
not use coax with PVC insulation. NAT recommends Teflon dielectric cable 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 (Effective
Radiated Power) to less than 50% of specification.
To prevent RF interference between similar systems, NAT recommends that VHF FM
coax runs be widely separated, or be made using triaxial cable. Bond the outer shield
to the airframe at the transceiver end only.
In communication intensive applications, bad cable routing and shielding may drastically
compromise over-all system performance. Symptoms will be spurious squelch opening,
RFI (Radio-Frequency Interference), and garbled reception.
Neatly terminate RF cables (solder or crimp) and test for shorts prior to system checkout (not while connected to the radio!!). Keep cable bends to a minimum at the antenna.
Page 2-2
Oct 25, 2002
ENG-FORM: 805-0104.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM28 Rev. 2.10
NTX Series Remote Mount FM Transceivers Manual
Avoid sharp bends in the coax cables (minimum 3" radius) to prevent severe reflections.
If sharp bends are required use 90° elbow adapters.
Fabrication and installation of wiring harness should be in accordance with AC43.13-1B
chapter 11, sections 5 to 13, 16 and 17.
Grounding and bonding should be in accordance with AC43.13-1B chapter 11, section 15.
2.3.5
Antennas
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. Avoid any placement that puts antennas of like
frequencies close together.
Installation of the antenna should be in accordance with AC43.13-1B 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 ft 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
communication system wavelengths.
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.
Surround any blade or whip antenna with a ground plane surface (metallic, grounded
material) having a radius equal to or greater than the height of the antenna. Poor
grounding will result in severe reflected power and high levels of RFI throughout the
airframe.
Any antenna will be less prone to interference from rotor modulation and other undesirable
stimuli if installed correctly and surrounded by a large metallic ground plane. Under the
same conditions, it 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.
2.3.6
Mechanical Mounting
Installation of the transceiver should be in accordance with AC 43.13-1B chapter 7,
section 2 to 7, and AC 43.13-2A chapter 2.
The NTX Series Transceiver is a tray-mounted device and uses a standard 1/4 ATR
style tray. Mount (with counter-sunk screws) onto a clean, grounded surface having a
resistance of less than 0.5 ohms to airframe ground.
Oct 25, 2002
Page 2-3
ENG-FORM: 805-0104.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
NTX Series Remote Mount FM Transceivers Manual
SM28 Rev. 2.10
The NTX Series Transceiver may be mounted in any attitude, but upright (mounting
hook at the bottom) is preferred for access and condensation drainage.
2.3.7
Post-Installation Checks
2.3.7.1
Voltage/resistance checks
Do not attach the NTX Series Transceiver until the following conditions are met.
Check the following:
a)
P101 pins <5> and <6> for +28 Vdc relative to ground.
b)
P101 pins <8> and <20> for continuity to ground (below 0.5 Ω).
Ensure that the antenna is disconnected for the following test or erroneous
readings may be obtained.
c)
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.
2.3.7.2
Power On checks
a)
Install the NTX Series Transceiver and power up the ship’s systems. Turn on the
control head. 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 keying the radio 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,
set the tones to OFF (via the Status Edit mode) during scanning so that all
channels will be heard.
e)
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.
Page 2-4
Oct 25, 2002
ENG-FORM: 805-0104.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
SM28 Rev. 2.10
2.3.8
NTX Series Remote Mount FM Transceivers Manual
Post-Installation EMI Test
The purpose of this test is to identify any interference that the NTX138 may cause with
existing aircraft systems. The NTX138 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 NTX138 is ‘on condition’ only.
products is not required.
2.5
Periodic maintenance of these
Installation Drawings
Note:
The NTX138 drawings listed below are valid for the installation of
all NTX Series models.
DRAWING
REV. DESCRIPTION
TYPE
NTX138\403-0
1.22
Remote Mount Radio
Interconnect
NTX138\405-0
1.00
Remote Mount Radio
Connector Map
NTX138\922-0
1.02
Remote Mount Radio
Mechanical
NTX-VT1\922-0
1.00
Vertical Mount Tray
Mechanical
NTX138\634-0
1.00
Post-Installation EMI Test
Installation Approval Test Procedure
Section 2.0 ends after these Drawings
Oct 25, 2002
Page 2-5
ENG-FORM: 805-0104.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.

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Creation Date                   : 2003:04:09 13:02:52Z
Mod Date                        : 2003:04:09 11:20:16-03:00
Producer                        : Acrobat Distiller 5.0 (Windows)
Author                          : Margaret Brunsden
Metadata Date                   : 2003:04:09 11:20:16-03:00
Creator                         : Margaret Brunsden
Title                           : Section 2.0 Installation
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