COBHAM FliteLine CVC-151 Installation guide

COBHAM
Brand
COBHAM
Model
FliteLine CVC-151
Type
Installation guide

COBHAM FliteLine CVC-151 is VHF communication system designed and manufactured by Wulfsberg Electronics, featuring top quality avionics products for civil, air transport, and military applications.

COBHAM FliteLine CVC-151 is VHF communication system designed and manufactured by Wulfsberg Electronics, featuring top quality avionics products for civil, air transport, and military applications.

Page 1
REVISION HISTORY
Refer to the DCA and associated markups for a complete description of
the changes incorporated in a revision.
REV
DCA
DATE
DRAWN
APPROVED
PUBLISHED
H
W12974
02/26/2013
Ken Marshall
Pat Maneely
Linda Andujo
THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION.
NEITHER RECEIPT NOR POSSESSION OF THIS DOCUMENT CONFERS ANY RIGHT TO REPRODUCE, USE OR DISCLOSE, IN WHOLE OR IN PART, ANY
INFORMATION CONTAINED IN THIS DOCUMENT WITHOUT WRITTEN AUTHORIZATION FROM WULFSBERG ELECTRONICS.
TEMPLATE 150-744545-01 REV. C
Chelton Avionics, Inc.
dba Wulfsberg Electronics Division
Prescott, AZ
CAGE
CODE
1B7G3
A
PRINTED
COPY OF THIS DOCUMENT MAY NOT BE THE
LATEST REVISION.
IT IS THE USER’S RESPONSIBILITY TO ENSURE THAT HE OR
SHE IS USING THE LATEST DOCUMENT REVISION.
THE LATEST REVISION MAY BE VIEWED OR PRINTED FROM THE
ELECTRONIC DOCUMENT DISTRIBUTION SYSTEM.
DOCUMENT TITLE
Installation Manual,
CVC-151 VHF
Communication System
SIZE
A
LRU
CVC-151
DOCUMENT NUMBER
150-048100
REV
H
Typed signatures indicate approval. Handwritten signature approval of
this document is on file at Wulfsberg Electronics, Prescott, Arizona.
SCALE: NONE
DO NOT SCALE DRAWING
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CVC-151
VHF Communication System
Installation Manual
150-048100 Rev. H
Page 2
Installation
Manual
Engineering and Production of FliteLine™ Components by
Wulfsberg Electronics, A Cobham Avionics & Surveillance Group Company
Wulfsberg Electronics
CVC-151
FliteLine VHF
Transceiver System
Manual Number 150-048100
Revision H
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CVC-151
VHF Communication System
Installation Manual
150-048100 Rev. H
Page 3
Wulfsberg Electronics, A Cobham Avionics & Surveillance Group Company located in Prescott, Arizona, designs
and manufactures the Wulfsberg Electronics FliteLine™ line of products, including the CVC-151 VHF
Communication System. For more than 25 years, Wulfsberg Electronics. has distinguished itself by providing top
quality avionics products for civil, air transport, and military applications.
Wulfsberg Electronics makes no warranty, expressed or implied, with regard to this manual, including but not
limited to any implied warranties of merchantability, fitness for a particular purpose, and non-infringement. In
addition, Wulfsberg Electronics makes no warranty with regard to the documentation or data contained herein.
Wulfsberg Electronics is not liable in the event of incidental, special, consequential, or any other damages in
connection with or arising from furnishing, performance, or use of this manual.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s
authority to operate the equipment
Reproduction of this publication or any portion thereof by any means is prohibited. For further information contact
Sales, Wulfsberg Electronics, 6400 Wilkinson Drive, Prescott, Arizona, 86301. Telephone: (928) 708-1500.
Information in this manual is subject to change without notice.
2004 Wulfsberg Electronics. All rights reserved
CVC-151 are trademarks of Wulfsberg Electronics.
PROPRIETARY NOTICE
This document contains proprietary information and such information may not be disclosed to others for any
purpose, nor used for manufacturing purposes without written permission from Wulfsberg Electronics.
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CVC-151
VHF Communication System
Installation Manual
Table of Contents
150-048100 Rev. H
Page 4
Rev
No.
Rev
Date
Date
Inserted
By
Rev
No.
Rev
Date
Date
Inserted
By
A
12/15/2005
B
01/12/2006
C
09/08/2006
D
03/29/2007
E
08/22/2007
F
04/21/2009
G
09/10/2009
H
03-06-2013
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CVC-151
VHF Communication System
Installation Manual
Table of Contents
150-048100 Rev. H
Page 5
Section Page
SECTION 1 – GENERAL INFORMATION
1.1 Introduction .......................................................................................................................................... 7
1.2 Applicability ........................................................................................................................................... 7
1.3 Equipment Description ......................................................................................................................... 7
A. CVC-151 VHF Communications Transceiver .............................................................................. 7
B. CVC-151 Control Display Unit .................................................................................................... 7
1.4 Available Configuration Variations ........................................................................................................ 8
1.5 Technical Specifications .................................................................................................................... 11
1.6 Recognized ARINC 429 VHF Tuning Commands and Formats ....................................................... 13
1.7 Installation Kits and Accessories ........................................................................................................ 14
A. CVC-151 Connector Kit ................................................................................................................. 14
B. Single Mounting ............................................................................................................................. 14
C. Dual Mounting ............................................................................................................................... 14
D. Retrofit Installation ........................................................................................................................ 14
1.8 Accessories Required But Not Supplied ............................................................................................. 14
1.9 Recommended Antennas ................................................................................................................... 15
1.10 Tools Required But Not Supplies........................................................................................................ 15
1.11 License Requirements ........................................................................................................................ 15
1.12 Instruction for Continued Airworthiness .............................................................................................. 15
1.13 Certification Considerations ................................................................................................................ 15
1.14 FCC Compliance................................................................................................................................. 16
1.15 ESDS Device Labels and Symbols .................................................................................................... 16
SECTION 2 – INSTALLATION
2.1 General ............................................................................................................................................... 17
2.2 Unpacking and Inspecting Equipment ............................................................................................... 17
2.3 Equipment Installation ....................................................................................................................... 17
A. Cooling Considerations ............................................................................................................. 17
B. CVC-151 Mechanical Installation .............................................................................................. 17
C. Dual Installation Considerations ................................................................................................ 18
Mounting Tray Installation Drawing, 154-048100 (Figure 2-2) .................................................. 20
Mounting Tray Envelope Drawing, 154-04047 (Figure 2-3) ...................................................... 23
CVC-151 to CVC-152 Interconnect Wiring Diagram, 152-248130 (Figure 2-4) ........................ 25
CVC-151 & CVN-251 to CCN-955 Interconnect Wiring Diagram, 152-248150 (Figure 2-5) ..... 26
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CVC-151
VHF Communication System
Installation Manual
Table of Contents
150-048100 Rev. H
Page 6
Section Page
SECTION 2 – INSTALLATION (cont’d)
D. CVC-151 Harnesses and Connector Assembly ........................................................................ 27
E. Antenna Installation ................................................................................................................... 32
F. Optional Strapping ...................................................................................................................... 32
2.4 Post-Installation Check ....................................................................................................................... 33
A. System Test ................................................................................................................................ 33
2.5 Flight Check ................................................................................................................................ 34
SECTION 3 – OPERATION
1. General .............................................................................................................................................. 35
LIST OF TABLES
1-1 CVC-151 Configuration Variations........................................................................................................ 8
1-2 CVC-151 Specifications ...................................................................................................................... 11
1-3 ARINC 429 Received Labels .............................................................................................................. 13
1-4 ARINC 429 Transmitted Labels .......................................................................................................... 13
1-5 CVC-151 ARINC Sign Status Matrix Definition .................................................................................. 13
1-6 CVC-151 Frequency Channel Pairing Plan per ARINC 716 ............................................................. 13
1-7 CVC-151 Connector Kit Part List (050-02398-0000, Rev E) .............................................................. 14
1-8 Recommended Antennas ................................................................................................................... 15
2-1 CVN-251 Pin-outs ............................................................................................................................... 29
2-2 Strapping Options ............................................................................................................................... 33
LIST OF FIGURES
Figure Page
1 Electrostatic Discharge Sensitive Device Labels and Symbols .......................................................... 16
2-1 Three Radio System Transmit Interlock Wiring 1 .............................................................................. 19
2-6 RF Cable Fabrication .......................................................................................................................... 27
2-7 CVC-151 Rack Mount Connector ....................................................................................................... 28
2-8 CVC-151 Polarizing Post Assembly ................................................................................................... 31
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CVC-151
VHF Communication System
Installation Manual
Section 1 - General Information
150-048100 Rev. H
Page 7
SECTION 1 – GENERAL INFORMATION
1.1 INTRODUCTION
This section contains information relative to the physical, mechanical, and electrical characteristics of the Wulfsberg
CVC-151 VHF Communications System.
1.2 APPLICABILITY
This manual is applicable to all CVC-151 FliteLine VHF Communication Receivers built at the Prescott, Arizona
facility.
1.3 EQUIPMENT DESCRIPTION
The Wulfsberg FliteLine VHF Communications System is a fully synthesized ATC VHF transceiver with certification
to TSO-C169 that provides a voice/data communications link between the aircraft and ground facilities. The
FliteLine COM System consists of a lightweight, remote-mounted CVC-151 Transceiver and a RMU or single
control head. Some compatible methods of control are the CVC-152 control head, CD-402 control head, or the
RMU-556 Radio Management Unit. Other means of control are an ARINC 429 radio management system, which
processes the ARINC commands listed in the ARINC 429 section.
A. CVC-151 VHF COMMUNICATIONS TRANSCEIVER
The CVC-151 VHF Communications Transceiver is available with fixed 25 kHz channel spacing, or
selectable between 25 kHz and 8.33 kHz channel spacing. Operation over the frequency range of 118.00
– 136.975 MHz is standard. Extended operation over the frequency range of 118.00 – 151.975 MHz is
available as an option. VDL Mode II or III operation is also available as an option.
The CVC-151 is designed for rack mounting. The case is fitted with a handle on the front panel for ease of
handling during installation and removal.
The CVC-151 consists of three functional electrical subassemblies interconnected via ribbon cables. The
subassemblies are easily removable and are accessible for service with extension cables.
The subassemblies are plug-in, enabling fault isolation through module substitution. A single connector
accepts all harness wiring on the rear of the CVC-151, while a front mounted BNC type RF connector
provides the VHF antenna connection through conventional coaxial cable.
B. CVC-152 CONTROL DISPLAY UNIT
The CVC-152 Control Display Unit is designed to be mounted in the instrument panel individually, or
combined in pairs with an adapter plate that will fit a standard DZUS mounting.
The control display establishes and displays the operating status of all the CVC-151 functions. Nonvolatile
memory is used to retain the last frequency used, thus eliminating frequency changes as a result of
momentary or extended power disruptions.
The system uses full-time self-test to monitor key internal circuits and will display the word "FAIL" followed
by a preassigned number to indicate which specific module has failed on the CVC-152 display.
The system is designed for compatibility with ARINC Characteristic 429 Digital Information Transfer System
to allow external frequency control of the VHF communications system.
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CVC-151
VHF Communication System
Installation Manual
Section 1 - General Information
150-048100 Rev. H
Page 8
1.4 AVAILABLE CONFIGURATION VARIATIONS
The CVC-151 is designed to be plug compatible with most older VC-401B installations. To accommodate the
smaller size and weight of the CVC-151, versions are available with a ballast and/or adapter bracket to fit the large
rack of the VC-401B and match the VC-401B weight as required.
The following tables list the currently available configuration variations of the CVC-151.
Table 1-1 CVC-151 Configuration Variation - Rev. AA
Continues…….
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CVC-151
VHF Communication System
Installation Manual
Section 1 - General Information
150-048100 Rev. H
Page 9
Table 1-1. CVC-151 Configuration Variations Rev. AA (cont’d)
Continue
s…….
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CVC-151
VHF Communication System
Installation Manual
Section 1 - General Information
150-048100 Rev. H
Page 10
Table 1-1. CVC-151 Configuration Variations Rev. AA (cont’d)
Note: Radios with 8.33 kHz capability will tune both 25 kHz and 8.33 kHz channels. The 8.33 kHz tuning
may be disabled by grounding pin 48 on the radio when only 25 kHz channels are desired.
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CVC-151
VHF Communication System
Installation Manual
Section 1 - General Information
150-048100 Rev. H
Page 11
1.5 TECHNICAL SPECIFICATIONS
Table 1-2 CVC-151 Specifications
CERTIFICATION:
Transmitter
TSO-C169, DO-186A Class 3 & 5, and EUROCAE ED-23B, DO-160E
ENV CAT.
[(F2)Z]AAB[S(M)R(B)(B1)U(G)]EWXXXXZZAZCC[FY]H[A3E33]XXAX
Receiver
TSO-C169, DO-186A Class C & E, and EUROCAE ED-23B, DO-160E
ENV. CAT.
[(F2)Z]AAB[S(M)R(B)(B1)U(G)]EWXXXXZZAZCC[FY]H[A3E33]XXAX
Intermodulation
Paragraph 2.2.10 (EUROCAE ED-23B, Section 3.1.10)
Desensitization
Paragraph 2.2.11 (EUROCAE ED-23B, Section 3.1.11)
FCC IDENTIFICATION:
FRWCVC-151
TEMPERATURE RANGE:
Operational
-55 C to +70 C (-67 F to +158 F)
Storage
-55 C to +85 C (-67 F to +185 F)
COOLING:
Free air circulation
ALTITUDE:
55,000 feet (16,764 meters)
WEIGHT (Standard Configuration) *:
CVC-151 Unit
4.2 lbs. (1.9 kg) +/- 0.2 lbs (.09 kg)
Single mounting tray
0.85 lbs. (0.39 kg) +/- 0.2 lbs (.09 kg)
Dual mounting tray
2.16 lbs. (.98 kg) +/- 0.2 lbs (.09 kg)
OVERALL DIMENSIONS (Standard Configuration) *:
Height:
4.00 inches maximum (101.60 mm)
Width:
2.40 inches maximum (60.96 mm)
Length:
13.30 inches maximum (337.82 mm)
*Note:
See Figures 2-2 to 2-4 for weights and dimensions of CVC-151 in mounting tray and with
available options.
INPUT POWER REQUIREMENTS:
Receive (NORM)
22 to 33 VDC, 0.8 Amps @ 22 V
27.5 VDC, 0.8 Amps typical
(EMER)
18.0 VDC, 1.1 Amperes typical
Transmit (NORM)
22 to 33 VDC, 7.1 Amps @ 22 V
27.5 VDC, 5.4 Amps typical
(EMER)
18.0 VDC, 8.9 Amperes typical
FREQUENCY RANGE:
118.000 MHz to 136.975 MHz
118.000 MHz to 151.975 MHz optional
FREQUENCY STABILITY:
± 2.5 PPM
Continues…….
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CVC-151
VHF Communication System
Installation Manual
Section 1 - General Information
150-048100 Rev. H
Page 12
Table 1-2. CVC-151 Specifications (cont'd)
CHANNEL SPACING:
8.33 kHz Fixed, 25 kHz Fixed, 8.33/25 kHz Switchable
RF POWER OUTPUT:
20 Watts nominal, 16 Watts minimum over temperature
DUTY CYCLE:
1 min on 4 min off, continuous at reduced power without damage to
unit.
HARMONIC CONTENT:
60 dB down from carrier minimum
TX SPURIOUS OUTPUT:
80 dB down from carrier minimum
MODULATION
CAPABILITY:
85% minimum with 95% limiting @ 1 kHz
MODULATION FIDELITY:
4 dB maximum variation in modulation percentage,
350 Hz to 2,500 Hz
RECEIVER SENSITIVITY:
2.0 V maximum for 6 dB (S+N)/N (hard)
NOISE LEVEL:
30 dB minimum (S+N)/N ratio for 100 V
SELECTIVITY:
`
25 kHz MODE:
-6 dB maximum at 10 Hz, -60 dB minimum 25 Hz
8.33 kHz MODE:
-6 dB maximum at 3.55 Hz, -60 dB minimum 5.05 Hz
AGC RANGE:
3 dB maximum audio variation, 5 to 10,000 V
AUDIO OUTPUT:
10 mW into 600 ohm load,
20 mW into 600 ohm load,
40 mW into 600 ohm load
As defined by the part number: 5% tolerance
AUDIO RESPONSE:
3 dB maximum variation, 350 Hz to 2,500 Hz
40 dB minimum attenuation at 4,000 Hz
AUDIO DISTORTION:
Receive
5% max. at rated output (85% modulation at 100-10,000 V)
Transmit
10% maximum (85% modulation), 350 Hz to 2,500 Hz
AUDIO INPUT:
Dynamic or carbon microphone, 0.250 V to 2.5 V operation range
SIDETONE OUTPUT:
10 mW into 600 ohms (85% modulation)
20 mW into 600 ohms (85% modulation)
40 mW into 600 ohms (85% modulation)
As defined by the part number: 5% tolerance
SIDETONE FIDELITY:
3 dB maximum variation, 350 Hz to 2,500 Hz
FREQUENCY CONTROL:
Gray Code/ARINC 429
ARINC Label 030, for 25 kHz tuning
ARINC Label 047, for 8.33 kHz tuning
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CVC-151
VHF Communication System
Installation Manual
Section 1 - General Information
150-048100 Rev. H
Page 13
1.6 RECOGNIZED ARINC 429 VHF TUNING COMMANDS AND FORMATS
The CVC-151 has two ARINC 429 receive buses and one ARINC 429 transmit bus. Data received on either of the ARINC
input channels will tune the radio. ARINC data with a label of 030 will tune the radio to a 25 kHz channel. ARINC data
with a label of 047 will tune the radio to an 8.33 kHz channel if the radio has 8.33 kHz capability. The CVC-151 re-
transmits the frequency it is currently tuned to over the output ARINC 429 bus.
Table 1-3. ARINC 429 Received Labels
LABEL
INFO CONTAINED IN LABEL
UNITS
FORMAT
SPEED
030
25 kHz FREQUENCY
MHz
BCD
LOW
047
8.33 kHz FREQUENCY
MHz
BCD
LOW
Table 1-4. ARINC 429 Transmitted Labels
LABEL
INFO CONTAINED IN LABEL
UNITS
FORMAT
SPEED
030
25 kHz FREQUENCY
MHz
BCD
LOW
047
8.33 kHz FREQUENCY
MHz
BCD
LOW
371
COMPANY INFORMATION LABEL
DSC
Application
Dependent
LOW
Table 1-5. CVC-151 ARINC Sign Status Matrix Definition
31
30
Status
0
0
Verified
0
1
No Computed Data
1
0
Functional Test
1
1
Squelch Open
Table 1-6. CVC-151, Frequency Channel Pairing Plan per ARINC 716
Frequency
(MHz)
Channel Spacing
(kHz)
Channel
Name
Labels
Transmitted
ARINC 429
Word Content
118.0000
25
118.000
030
18.000
118.0000
8.33
118.005
047
18.000
118.0083
8.33
118.010
047
18.008
118.0167
8.33
118.015
047
18.017
118.0250
25
118.025
030
18.025
118.0250
8.33
118.030
047
18.025
.
.
.
.
.
.
.
.
.
.
156.0000
25
156.000
030
56.000
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CVC-151
VHF Communication System
Installation Manual
Section 1 - General Information
150-048100 Rev. H
Page 14
1.7 INSTALLATION KITS AND ACCESSORIES
A. CVC-151 CONNECTOR KIT
Installation of a CVC-151 requires a connector kit, P/N 050-02398-0000. The contents of the kit are as
follows:
Table 1-7. Part list, CVC-151 Connector Kit (050-02398-0000, Rev E)
B. SINGLE MOUNTING
When installing a single system, use P/N 400-048124-01 (Single Mounting Tray, Non-Safety Wire
Compatible, 2.5 inch), P/N 071-04047-0000 (Single Mounting Tray, Safety Wire Compatible, 4 inch), or P/N
071-04047-0002 (Single Mounting Tray, Non-Safety Wire Compatible, 4 inch), and one connector kit (050-
02398-0000).
C. DUAL MOUNTING
The CVC-151 racks are designed for stacking two units when required, as shown in Figure 2-4 and 2-5.
Installing a dual mounted configuration requires P/N 400-048124-02 (Dual Mounting Tray, Non-Safety Wire
Compatible, 2.5 inch), P/N 071-04047-0001 (Dual Mounting Tray, Safety Wire Compatible, 4 inch), or P/N
071-04047-0003 (Dual Mounting Tray, Non-Safety Wire Compatible 4 inch), with two connector kits (050-
02398-0000).
D. RETROFIT INSTALLATIONS
The CVC-151 is designed to be installed in the VC-401, 4” mounting rack, P/N 071-04047-0000, without any
aircraft changes. This allows for retrofit into existing installations with minimum effort. An adapter bracket is
available to allow mounting of the CVC-151 into the wider Series III rack. This can be ordered pre-installed
on the unit or as an adapter kit, P/N 149-448014-01.
Note: Retrofit mounting will require a weight and balance change to the aircraft.
1.8 ACCESSORIES REQUIRED BUT NOT SUPPLIED
Headphone, speaker, or audio panel with a 600 ohm impedance that accepts the rated output power.
A VHF Broadband Antenna with a 50 impedance and a maximum of VSWR 3:1.
Microphone or audio panel with a minimum output level of 250 mV.
Coaxial connectors and inter-wiring harness.
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CVC-151
VHF Communication System
Installation Manual
Section 1 - General Information
150-048100 Rev. H
Page 15
1.9 RECOMMENDED ANTENNAS
The following is list of recommended Wulfsberg antennas for the CVC-151. The installer is responsible for
determining if these antennas are appropriate for the given installation.
Table 1-8 CVC-151 Recommended Antennas
Part number
Frequency Range
Maximum Aircraft Speed
CI 108
118-137 MHz
600 knots
CI 108L
118-137 MHz
600 knots
CI 211-1
118-154 MHz
573 knots
CI 108-1
118-153 MHz
350 knots
1.10 TOOLS REQUIRED BUT NOT SUPPLIED
A special crimping tool, positioner and an insertion/extraction tool are needed when the
CVC-151 is installed. These tools and their part numbers (P/N) are listed below.
CRIMPING TOOL
POSITIONER
INSERTION/EXTRACTION TOOL
MIL M22520/2-01
MIL M22520/2-23
AMP P/N 91066-1
1.11 LICENSE REQUIREMENTS
Check in the country of operation with the governing body for any licensing requirements. The end user is
responsible for obtaining any required licenses.
This equipment has been type accepted by the FCC under type acceptance number FRWCVC-151.
1.12 Instruction for Continued Airworthiness
There is no periodic maintenance for this article. Maintenance and/or repair is only upon failure.
1.13 CERTIFICATION CONSIDERATIONS
The conditions and test for TSO approval of this article are minimum performance standards. It is the responsibility
of those desiring to install this article either on or within a specific type or class of aircraft to determine that the
aircraft installation conditions are within the TSO standards. The article may be installed only if further evaluation by
the applicant, i.e. user/installer, documents an acceptable installation and is approved by the Administrator.
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CVC-151
VHF Communication System
Installation Manual
Section 1 - General Information
150-048100 Rev. H
Page 16
1.14 FCC Compliance
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This
device may not cause harmful interference, and (2) this device must accept any interference received, including
interference that may cause undesired operation.
Part 15.21
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s
authority to operate the equipment.
Note: The manufacturer is not responsible for any radio or TV interference caused by unauthorized
modifications to this equipment. Such modifications could void the user’s authority to operate the
equipment.
1.15 ESDS Device Labels and Symbols
Caution: This equipment contains electrostatic discharge sensitive (ESDS) devices. All modules containing
ESDS devices are flagged or identified on schematics and assembly illustrations, and are
individually identified in the parts list. All ESDS devices must be handled in accordance with
procedures outlined in the "repair" section of this manual.
ESDS devices include, but are not limited to, C-MOS, J-MOS, PMOS, NMOS, SOCMOS, HMOS,
MOS/FET, microwave mixer diodes, some bipolar devices, and some metal film resistors.
The labels and symbols shown in Figure 1 are used by Wulfsberg to identify ESDS applications. The labels DO
NOT appear on units and modules manufactured prior to the adoption of the STANDARD symbol.
Identifies ESDS device is present and need for
special handling exists.
Figure 1. Electrostatic Discharge Sensitive (ESDS) Device Labels and Symbols
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CVC-151
VHF Communication System
Installation Manual
Section 2 – Installation
150-048100 Rev. H
Page 17
SECTION 2 – INSTALLATION
2.1 General
This section contains suggestions and factors to consider before installing the CVC-151. Close
adherence to these suggestions will assure a more satisfactory performance from the equipment.
2.2 Unpacking and Inspecting Equipment
Exercise care when unpacking the equipment. Make a visual inspection of the units for evidence of
damage incurred during shipment. If a claim for damage is to be made, save the shipping container to
substantiate the claim. The claim should be promptly filed with the transportation company. It would be
advisable to retain the container and packaging material after all equipment has been removed in the
event that equipment storage or reshipment should become necessary.
2.3 Equipment Installation
The CVC-151 installation will conform to standards designated by the customer, installing agency, and
existing conditions as to the unit location and type of installation. See Figure 2-2 for an outline drawing of
the equipment. Before beginning installation the installer should review the drawings, electrical interwiring
diagram and installation pictorials which are located in this section, and establish requirements to a
particular aircraft.
A. Cooling Considerations
The greatest single contributor to increased reliability of all modern day avionics is reducing the
maximum operating temperature of the individual units. While modern day circuit designs consume
far less electrical energy, the watts per cubic inch dissipated within the avionics units still remains
much the same due to high density packaging techniques utilized. Consequently, the importance of
providing avionics cooling is essential to the life span of the unit.
While each individual unit may not require forced air cooling, the combined heat load of several
units operating in a typical avionics location will significantly degrade the reliability of the avionics if
provisions for cooling are not incorporated in the initial installation. Failure to provide cooling will
certainly lead to increased avionics maintenance costs and may void the Wulfsberg warranty.
B. CVC-151 Mechanical Installation
(1) Select the CVC-151 mounting location. The location should be free from excessive moisture,
vibration, heat and noise generating sources. The unit can be rigidly mounted. Allow at least
one inch of free air space around the top and rear of the unit and one-half inch along each
side. Allow adequate space for installation of cables and connectors.
(2) Refer to Figures 2-2 to 2-3 for the CVC-151 mounting dimensions.
(3) Mark, punch, and drill the mounting holes. Care must be taken to avoid damage to adjacent
equipment or cables.
(4) Secure the mounting tray firmly in place.
(5) Secure the CVC-151 to the mounting tray.
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CVC-151
VHF Communication System
Installation Manual
Section 2 – Installation
150-048100 Rev. H
Page 18
C. Dual Installation Considerations
(1) Reduction of cross radio interference by using Transmit Interlock feature.
All radio transceivers have a noise floor associated with the transmitted output signal. When two or
more radios are installed on the same aircraft, the transmitted noise floor can cause the squelch of a
radio operating in receive to open if care is not taken to maximize the isolation between the antennas
of the two systems. Isolation of greater than 35 dB between the antennas should be a system design
goal. However, due to the size of the aircraft or limited locations for antenna mounting, it may not be
possible to obtain optimal antenna isolation or location.
In non-optimal situations, to reduce squelch opening during radio transmission, a Transmit Interlock
function, pin 86, is available that reduces the sensitivity of the affected receiver when activated. The
input for this function is open collector logic. To enable this function, this pin should be pulled to
ground only during transmission of other radio systems.
On a two radio system the Transmit Interlock function can be implemented by the addition of two
lines connecting the desired push-to-talk (PTT) lines and the Transmit Interlock pins as follows:
CVC-151 System #1 CVC-151 System #2
P1001 P1001
PTTLOWMIC /_
, pin 80 to
INTERLOCKTX _
, pin 86
or
2PTTVOICE _
, pin 73 to
INTERLOCKTX _
, pin 86
and
INTERLOCKTX _
, pin 86 to
PTTLOWMIC /_
, pin 80
or
INTERLOCKTX _
, pin 86 to
2PTTVOICE _
, pin 73
It is important to notice that
PTTLOWMIC /_
is the audio return line as well as a PTT input for the radio.
This input is designed for carbon microphones that combine the microphone bias and the PTT function.
For systems that have an independent PTT line,
2PTTVOICE _
should be used to eliminate the
possibility of noise coupling into the audio.
For three (3) CVC-151 installations six external diodes can be used to interconnect the PTT inputs to the
Transmit Interlock inputs. The circuit for this interconnection is shown in Figure 2-1. In this figure pin 80
is used as the PTT input but pin 73 should be used if a separate PTT line is used.
The document reference is online, please check the correspondence between the online documentation and the printed version.
CVC-151
VHF Communication System
Installation Manual
Section 2 – Installation
150-048100 Rev. H
Page 19
Figure 2-1 Three Radio System Transmit Interlock Wiring 1
The document reference is online, please check the correspondence between the online documentation and the printed version.
CVC-151
VHF Communication System
Installation Manual
Section 2 – Installation
150-048100 Rev. H
Page 20
Figure 2-2. CVC-151 Single Mounting Tray Installation (Sheet 1 of 3) (Dwg. No. 154-048100, Rev. D)
The document reference is online, please check the correspondence between the online documentation and the printed version.
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COBHAM FliteLine CVC-151 Installation guide

COBHAM
Brand
COBHAM
Model
FliteLine CVC-151
Type
Installation guide

COBHAM FliteLine CVC-151 is VHF communication system designed and manufactured by Wulfsberg Electronics, featuring top quality avionics products for civil, air transport, and military applications.

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