VOR Specification FAA-E-37012_Final_with MVPs highlighted.pdf

FAA-E-37012

June 24, 2025

U.S. Department of Transportation

Federal Aviation Administration

PERFORMANCE SPECIFICATION

VERY HIGH FREQUENCY (VHF)

OMNIDIRECTIONAL RADIO RANGE (VOR)

SYSTEM – CONVENTIONAL (CVOR) AND

DOPPLER (DVOR)

ii 06/24/2025

FOREWORD

1. This specification is approved for use by all Departments of the Federal Aviation Administration (FAA).

2. This specification defines the minimum requirements for the Very High Frequency (VHF) Omnidirectional Radio Range (VOR) System, Conventional VOR (CVOR) and Doppler VOR (DVOR) configurations.

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Table of Contents

1. INTRODUCTION

1.1 SCOPE

1.2 OVERVIEW

2. APPLICABLE DOCUMENTS

2.1 GENERAL

2.2 GOVERNMENT DOCUMENTS

2.2.1 Government Specifications, Standards and Handbooks

2.2.2 Other Government Documents, Drawings and Publications

2.3 NON-GOVERNMENT PUBLICATIONS

2.4 ORDER OF PRECEDENCE

3. REQUIREMENTS

3.1 GENERAL REQUIREMENTS

3.1.1 System Characteristics

3.1.2 VOR Antenna Compatibility

3.1.3 Integrity of Signal

3.1.4 Assigned Channel Assurance

3.1.5 Accuracy

3.1.6 Environmental Operating Conditions

3.1.6.1 NON-OPERATING CONDITIONS

3.1.6.2 OPERATING CONDITIONS

3.1.6.3 LIGHTNING PROTECTION

3.1.7 Electromagnetic Interference (EMI) / Electromagnetic Compatibility (EMC)

3.2 TRANSMITTER REQUIREMENTS

3.2.1 Operating Channels

3.2.1.1 CHANNEL FREQUENCY AND STABILITY

3.2.1.2 RF TUNING

3.2.2 Carrier Transmitter

3.2.2.1 TRANSMITTER POWER OUTPUT

3.2.2.2 CARRIER OUTPUT LEVEL AND CONTROL

3.2.2.3 CARRIER POWER STABILIZATION

3.2.2.4 CARRIER MODULATION

3.2.3 Sideband Output Characteristics

3.2.3.1 CONVENTIONAL SIDEBAND CHARACTERISTICS

3.2.3.2 DOPPLER SIDEBAND CHARACTERISTICS

3.2.4 Doppler VOR Distributor Assembly

3.2.4.1 DISTRIBUTOR FUNCTION

3.2.4.2 INSERTION LOSS

3.2.4.3 RF PHASE SHIFT

3.2.4.4 SWITCHING ISOLATION

3.2.4.5 DISTRIBUTOR MECHANICAL DESIGN

3.2.5 CVOR Carrier, DVOR Carrier, and DVOR Sideband Antennas

3.2.5.1 CVOR TRANSMITTING ANTENNA SETS

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3.2.5.2 DVOR SIDEBAND ANTENNAS

3.2.5.3 DVOR CARRIER ANTENNA

3.2.5.4 FASTENER MATERIALS

3.2.5.5 RF CONNECTORS

3.2.5.6 BALANCE-TO-UNBALANCE TRANSFORMERS

3.2.5.7 ANTENNA NAMEPLATE

3.2.5.8 ANTENNA INSULATORS

3.2.5.9 CAPACITOR PLATES

3.2.5.10 DVOR ANTENNA PEDESTAL COVER

3.2.5.11 ANTENNA FINISHES

3.2.5.12 MECHANICAL TOLERANCES

3.2.5.13 ELECTRICAL PERFORMANCE

3.2.5.14 INSULATION RESISTANCE

3.2.5.15 CVOR ANTENNA SHELTER

3.2.6 Thermal Overload Protection

3.2.7 Performance Upon a Fault Condition of RF Equipment Output Circuit

3.3 MONITOR

3.3.1 Operating Channels

3.3.1.1 BROADBAND OPERATION

3.3.1.2 RF TUNING

3.3.1.3 FREQUENCY AND ACCURACY STABILITY

3.3.1.4 RF INPUT LEVELS

3.3.1.5 INPUT INTERFERENCE IMMUNITY

3.3.1.6 RF INPUT CONNECTIONS

3.3.1.7 DETECTED AUDIO OUTPUT CHANNEL

3.3.2 VOR Monitor Operation

3.3.2.1 MONITOR ALARM ACTION

3.3.2.2 MONITORED PARAMETERS

3.3.2.3 TEST SIGNALS AND MONITORING ACTIVITIES

3.3.2.4 MONITOR FAILSAFE

3.3.2.5 VOR TEST GENERATOR

3.3.2.6 CVOR GROUND CHECK SYSTEM

3.3.2.7 DVOR FIELD MONITORING

3.3.2.8 TRANSMISSION LINE DIRECTIONAL COUPLER

3.4 CONTROL, STATUS AND INDICATOR FUNCTIONS

3.4.1 Front Panel

3.4.1.1 CONTROLS

3.4.1.2 STATUS AND INDICATORS

3.4.2 Maintenance Data Terminal (MDT)

3.4.3 Remote Control

3.4.4 Fault History

3.4.5 Fault Diagnostics

3.4.6 Trend Analysis Data Collection and Storage

3.4.7 Automatic Reset Function

3.5 REMOTE MAINTENANCE MONITORING (RMM)

3.5.1 Remote Monitoring Subsystem (RMS)

v

3.5.1.1 RMS FUNCTIONS

3.5.2 Alarm and Alert Messages

3.5.2.1 ALARMS

3.5.2.2 MAINTENANCE ALERTS

3.5.3 Non-Volatile Data Storage

3.5.4 RMS Data Sampling Rate

3.5.5 Spare Input/Output Capacity

3.5.6 Environmental Monitoring

3.5.6.1 INTRUSION DETECTOR

3.5.6.2 SMOKE DETECTOR

3.5.6.3 OBSTRUCTION LIGHT SENSOR

3.5.6.4 AC POWER SENSOR

3.5.6.5 TEMPERATURE SENSORS

3.5.7 RMS Security

3.5.7.1 SECURITY IMPLEMENTATION

3.5.7.2 SECURITY LEVEL DEFINITIONS

3.5.8 RMS Data and Control Filtering

3.5.9 RMS Failure Protection

3.5.10 Interface with RMM Subsystems

3.6 DATA SECURITY

3.6.1 Access Control

3.6.2 Audit Logging

3.7 VOR SYSTEM DESIGN CHARACTERISTICS

3.7.1 Maintainability

3.7.1.1 REAL TIME CLOCK/CALENDAR

3.7.2 Reliability

3.7.3 Modular Construction

3.7.3.1 EQUIPMENT MOUNTING

3.7.4 Test Points

3.7.5 Interchangeability

3.7.6 Corrective Maintenance

3.7.7 Preventative Maintenance

3.7.8 Software/Firmware Updates

3.7.9 Electrical Interfaces Between VOR, Monitor Antennas, and Distributor

3.7.10 RF Input/Output Connectors

3.7.11 Grounding and Bonding

3.7.12 Input Power

3.7.12.1 AC POWER

3.7.12.2 EQUIPMENT DIRECTLY CONNECTED TO LINE POWER

3.7.12.3 POWER PLUGS, CORDS, AND OUTLETS

3.7.12.4 LEAKAGE CURRENTS

3.7.12.5 POWER FACTOR

3.7.12.6 INRUSH CURRENT

3.7.12.7 HARMONIC DISTORTION

3.7.12.8 CIRCUIT OVERLOAD PROTECTION

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3.7.12.9 INPUT POWER CONDITIONS

3.7.13 DC Power

3.7.13.1 TRANSFORMER ISOLATION OF NON-SWITCHING DC POWER SUPPLIES

3.7.14 Removable Parts and Mating Connectors

3.7.15 Electronic Equipment Assembly Requirements

3.7.15.1 COMPONENT MOUNTING

3.7.15.2 PRINTED CIRCUIT BOARDS

3.7.15.3 ASSEMBLY

3.7.15.4 WIRE WRAP

3.7.16 Shelf Life

3.7.17 Accessibility

3.7.17.1 GENERAL

3.7.17.2 ENCLOSURES

3.7.17.3 MAINTENANCE ACCESS

3.7.18 Thermal Design

3.7.19 Materials Processes and Parts

3.7.19.1 DISSIMILAR METALS

3.7.19.2 METALS, CORROSION RESISTANCE

3.7.19.3 CORROSION-RESISTING FERROUS ALLOYS

3.7.19.4 FLAMMABLE MATERIALS

3.7.20 Equipment Manufacturing Processes

3.7.20.1 STRAIN RELIEF

3.7.20.2 PAINTED FINISH

3.7.21 Electrical Parts

3.7.21.1 BATTERIES

3.7.21.2 OVERCURRENT DEVICES

3.7.21.3 CONNECTORS WITH THERMOCOUPLE CONTACTS

3.7.21.4 ELECTRICAL POWER CONNECTORS

3.7.21.5 SWITCHES

3.7.21.6 WIRING

3.7.22 Toxic Products

3.7.23 Nameplates and Markings

3.7.23.1 NAMEPLATES

3.7.23.2 MARKINGS

3.7.24 Workmanship

3.7.24.1 CLEANING

3.7.24.2 THREADED PARTS OR DEVICES

3.7.24.3 SHIELDING

3.7.24.4 CONTAINMENT

3.7.24.5 INSULATION

3.7.24.6 CLEARANCE

3.7.25 Employee Safety

3.7.25.1 ELECTRICAL SAFETY

3.7.25.2 GROUND POTENTIAL

3.7.25.3 SHIELDING

3.7.25.4 GUARDING OF RF VOLTAGES

vii

3.7.25.5 INTERLOCKS

3.7.25.6 HIGH VOLTAGE PROTECTION

3.7.25.7 HIGH CURRENT PROTECTION

3.7.25.8 ELECTRICAL CONNECTORS

3.7.25.9 MECHANICAL HAZARDS

3.7.25.10 MECHANICAL INTERCONNECTION

3.7.25.11 GLASS FIBERS

3.7.25.12 SAFETY MARKINGS, SIGNS, TAGS, AND SYMBOLS

3.7.25.13 DISPLAY WARNINGS

3.7.25.14 BATTERY SAFETY

3.7.25.15 FIRE LIFE SAFETY

3.7.25.16 SEISMIC ANCHORING

3.7.25.17 PERSONAL PROTECTIVE EQUIPMENT (PPE)

3.7.26 Mechanical Parts

3.7.26.1 CONTROLS AND SWITCHES

3.7.26.2 FASTENER HARDWARE

3.7.26.3 VENTILATING FAN MOTORS

3.7.26.4 BEARINGS

3.7.27 Human Engineering

3.7.27.1 NOISE CRITERIA

3.7.27.2 IDENTIFICATION OF NOISE HAZARD AREAS AND EQUIPMENT

3.7.27.3 DISPLAY INFORMATION

3.7.27.4 VIRTUAL DISPLAYS - FLASH

3.8 INSTALLATION

4. VERIFICATION

4.1 METHODS OF VERIFICATION

4.1.1 Inspection (I)

4.1.2 Analysis (A)

4.1.3 Demonstration (D)

4.1.4 Test (T)

4.2 TEST ALLOCATION

4.2.1 Development Test (DT)

4.2.2 Operational Test (OT)

4.3 GENERAL PROCEDURES

4.3.1 Test Tools

4.3.1.1 ELECTRONIC TEST EQUIPMENT

4.3.1.2 TEST SIMULATORS

4.3.1.3 ANTENNA TEST RANGE

4.3.2 Electrical Grounding

4.4 SPECIFIC PROCEDURES

4.4.1 Environmental Conditions

4.4.1.1 NON-OPERATING CONDITIONS

4.4.1.2 OPERATING CONDITIONS

4.4.2 Electromagnetic Compatibility (EMC)

4.4.3 DVOR 30 Hz Amplitude Modulation

viii

4.4.4 Voice Amplifier Gain

4.4.5 CVOR Output Signal Spectrum

4.4.6 DVOR Sideband Modulation

4.4.7 Antennas

4.4.7.1 CVOR ANTENNA INPUT IMPEDANCE

4.4.7.2 DVOR ANTENNA INPUT IMPEDANCE

4.4.7.3 INSULATION RESISTANCE

4.4.7.4 DVOR FIELD MONITOR ANTENNA

4.4.8 Power Quality Requirements

4.4.8.1 POWER FACTOR

4.4.8.2 INRUSH CURRENTS

4.5 VERIFICATION REQUIREMENTS TRACEABILITY MATRIX

5. PACKAGING

6. NOTES

6.1 DEFINITIONS

6.1.1 30 Hz AM Signal

6.1.2 30 Hz FM Signal

6.1.3 Carrier Power

6.1.4 Continuous Wave (CW)

6.1.5 Control

6.1.6 Duantal Error

6.1.7 Electromagnetic Interference (EMI)

6.1.8 Executive Monitor

6.1.9 Failure

6.1.10 Fault Condition

6.1.11 FM Subcarrier Signal

6.1.12 Ground Check

6.1.13 Inrush Current

6.1.14 Line Replaceable Unit (LRU)

6.1.15 Mean Frequency

6.1.16 Mean Time Between Failures (MTBF)

6.1.17 Monitor Antenna

6.1.18 Monitor Delay Time

6.1.19 Octantal Error

6.1.20 Positive Attachment

6.1.21 Quadrantal Error

6.1.22 Reference Azimuth

6.1.23 Reference Ground Check

6.1.24 Remote Monitoring and Logging System (RMLS)

6.1.25 Remote Maintenance Monitoring

6.1.26 Special Tools

6.1.27 Spurious Radiation

6.1.28 Stray Radiation

ix

6.1.29 Transistor-Transistor Logic (TTL)

6.2 ACRONYMS, ABBREVIATIONS, AND INITIALIZATIONS

6.3 INTERNATIONAL CIVIL AVIATION ORGANIZATION (ICAO)

REQUIREMENTS TRACEABILITY

APPENDIX A - VOR FREQUENCY CHANNELIZATION

LIST OF FIGURES

FIGURE 3-1. VOR Block Diagram With CVOR Antenna System FIGURE 3-2. VOR Block Diagram With DVOR Antenna System FIGURE 3-3. Inrush Current Limit Ratios FIGURE 3-4. Nameplates FIGURE 3-5. Personnel Safety Sign Layout FIGURE 4-1. Power Quality Tests and Measurements Flow FIGURE 4-2. Inrush Current Limit Measurements

LIST OF TABLES

TABLE 4-1. Applicable Requirements From MIL-STD-461G TABLE 6-1. ICAO Annex 10 Compliance Matrix

06/24/2025

1. INTRODUCTION

1.1 Scope

This specification establishes the performance, design, test, manufacture, and acceptance requirements for the Conventional and Doppler configurations of the Very High Frequency (VHF) Omnidirectional Radio Range (VOR) System. The Conventional VOR (CVOR) and Doppler VOR (DVOR) Systems described within this specification are intended to be separate, complete solutions without the use of conversion kits.

1.2 Overview

The VOR System described herein is a radio frequency (RF) transmitter navigation system used for the transmission of signals to determine aircraft bearing from a ground station. The VOR System provides facility identification information and azimuth information to properly equipped users within a defined service volume.

2. APPLICABLE DOCUMENTS

2.1 General

The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification, or recommended for additional information, or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3 and 4 of this specification, whether or not they are listed in this section.

2.2 Government Documents

2.2.1 Government Specifications, Standards and Handbooks

The following specifications, standards, and handbooks of the exact revision level shown below form a part of this document to the extent specified herein.

FAA-C-1217H, Chg. 2 Electrical Work, Premises Wiring (2023)

FAA-E-3039A

Protocol Specification, Common Message Handling Protocol (CMHP) (2018)

FAA-G-2100J Electronic Equipment, General Requirements (2022)

FAA-STD-001B Color and Texture of Finishes for NAS Equipment (1976)

FAA-HF-STD-001B Human Factors Design Standard (2016)

FAA-STD-019G Lightning And Surge Protection, Grounding, Bonding And

Shielding Requirements For Facilities And Electronic Equipment (2024)

FAA-STD-032 Design Standards for National Airspace System Facilities (1996)

FAA-STD-049 Standard, Fiber Optic Telecommunication, Systems and Equipment (1994)

FAA Order 3900.19D FAA Occupational Safety and Health Policy (2024)

L-P-383 Federal Specification, Plastic Material, Polyester Resin, Glass Fiber Base, Low Pressure Laminated (1967)

MIL-DTL-5541F Detail Specification Chemical Conversion Coatings On Aluminum And Aluminum Alloys (2006)

MIL-HDBK-454C General Guidelines for Electronic Equipment (2021)

MIL-M-43248C Military Specification, Mats, Reinforcing, Glass Fiber (1982)

MIL-R-7575C Military Specification, Resin, Polyester, Low-Pressure Laminating (1966)

MIL-STD-461G Requirements for the Control of Electromagnetic Interference Characteristics of Subsystems and Equipment (2015)

MIL-STD-810H Test Method Standard, Environmental Engineering Considerations and Laboratory Tests (2019)

MIL-STD-889C Standard Practice, Dissimilar Metals (2016)

2.2.2 Other Government Documents, Drawings and Publications

The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

FAA Drawing B-21547E VOR Polarizer FAA Drawing B-50400C VOR Antenna Pedestal FAA Drawing B-50401D VOR Polarizer Pedestal FAA Drawing B-50402C VOR Antenna Support Plate FAA Drawing B-50403A VOR Antenna Pedestal Mounting Support Bonding

Segments FAA Drawing D-50399H VOR Loop Antenna Assembly FAA Drawing D-50435D Antenna Pedestal Mounting Support FAA Drawing D-50737B Doppler VOR Antenna Details FAA Drawing D-51007-1B Doppler VOR Sideband Antenna FAA Drawing D-51007-2D Doppler VOR Sideband Antenna Details FAA Drawing D-5288-1D VOR/VORTAC Facility Plastic Antenna Shelter 16' Cone

Elevation and Details FAA Drawing D-5288-2E VOR/VORTAC Facility Plastic Antenna Shelter 16' Cone

Door Hasp and Retainer Details FAA Drawing D-5288-3E VOR/VORTAC Facility Plastic Antenna Shelter 16' Cone

Door Hinge and Miscellaneous Details FAA Drawing D-5288-4E VOR/VORTAC Facility Plastic Antenna Shelter 16' Cone

Door Details and Parts List

FAA Drawing D-5615 Rev 6 Bracing Kit FAA Drawing DE-A-2611-4B VHF Loop Antenna Assembly Insulator FAA Drawing DE-B-2132B VOR Antenna Mounting Plate Locking Wedge FAA Drawing DE-B-2611-1J VHF Loop Antenna Assembly Insulator FAA Drawing DE-B-2611-3I VHF Loop Antenna Assembly Insulator FAA Drawing DE-B-3196A Pedestal Cover FAA Drawing DE-B-3428D VOR BALUN FAA Drawing DE-D-2744-1G Doppler VOR Carrier Antenna Assembly FAA Drawing DE-D-2744-2E Doppler VOR Carrier Antenna Mechanical Details FAA Drawing DE-D-2744-3D Doppler VOR Carrier Antenna Mechanical Details FAA Drawing DE-D-2744-4C Doppler VOR Carrier Antenna Nameplate FAA Drawing DE-D-2744-5B Doppler VOR Carrier Antenna Mechanical Details FAA Drawing DE-D-3202E VOR Antenna Shelter Dome

NAS-IC-51015108-01, v0.92 FAA Interface Control Document, Remote Monitoring and Logging System (RMLS) To Remote Monitoring Subsystem (RMS) Using Common Message Handling Protocol (CMHP) (2014)

2.3 Non-Government publications

The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

American National Standards Institute

ANSI Z358.1 American National Standard for Emergency Eyewash and Shower Equipment

(Copies of this document are available online at www.ansi.org)

American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE)

ASHRAE Standard 52.2 Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size (2020)

(Copies of this document are available online at www.ashrae.org)

American Society of Mechanical Engineers (ASME)

ASME Y14.44 Reference Designations for Electrical and Electronics Parts and Equipment (2008)

(Copies of this document are available online at www.asme.org)

Electronic Components Industry Association (ECIA) http://www.ansi.org/ http://www.ashrae.org/ http://www.asme.org/

EIA/ECA-310E Standard, Cabinets, Racks, Panels and Associated Equipment (2005)

(Copies of this document are available online at www.ecianow.org)

European Civil Aviation Equipment (EUROCAE)

ED-137/1C Interoperability Standards for VoIP ATM Components, Volume 1: Radio (2017)

ED-137/1C, Chg. 1 Interoperability Standards for VoIP ATM Components, Volume 1: Radio, Change 1 (2020)

(Copies of these documents are available online at www.eurocae.net)

Health Physics Society (HPS)

N2.1-2011 Radiation Symbol (2011) (Copies of this document are available online at www.hps.org.)

Institute of Electrical and Electronics Engineers (IEEE)

IEEE 149-1979 Test Procedures for Antennas (1979) IEEE C62.41.2-2002 IEEE Recommended Practice on Characterization of Surges in Low Voltage (1000 V and Less) AC Power Circuits (2002)

IEEE 519-2014 IEEE Recommended Practice and Requirements for Harmonic Control in Electric Power Systems (2014)

IEEE C95.1-2019 Standard for Safety Levels with Respect to Human Exposure to Electric, Magnetic, and Electromagnetic Fields, 0 Hz to 300 GHz (2019)

IEEE C95.2-2018 Standard for Radio-Frequency Energy and Current-Flow Symbols (2018)

IEEE 1100-2005 Recommended Practice for Powering and Grounding Electronic Equipment (2005)

(Copies of these documents are available online at www.ieee.org)

Institute for Printed Circuits (IPC)

IPC-CC-830C Qualification and Performance of Electrical Insulating Compound for Printed Wiring Assemblies (2018)

IPC J-STD-001H Requirements for Soldered Electrical and Electronic Assemblies (2020)

IPC-CM-770E Guidelines for Printed Board Component Mounting (2004) http://www.ecianow.org/ http://www.eurocae.net/ http://www.hps.org/ http://www.ieee.org/

IPC-SM-780 Component Packaging and Interconnecting with Emphasis on Surface Mounting (1988)

IPC-A-600K Acceptability of Printed Boards (2020) IPC-A-610H Acceptability of Electronic Assemblies (2020)

(Copies of these documents are available online at www.ipc.org)

International Electrotechnical Commission (IEC)

IEC 61000-3-2 Electromagnetic compatibility (EMC) – Part 3-2: Limits for harmonic current emissions (equipment input current ≤ 16 A per phase) (2018)

(Copies of this document are available online at www.iec.ch)

National Electrical Manufacturers Association (NEMA)

NEMA 250-2018 Enclosures for Electrical Equipment (1000 Volts Maximum) (2018)

NEMA C18.1M, Part 1 American National Standard for Portable Primary Cells and Batteries with Aqueous Electrolyte – General and Specifications (2021)

NEMA C18.1M, Part 2 American National Standard for Portable Primary Cells and Batteries with Aqueous Electrolyte – Safety Standard (2019)

NEMA C18.2M, Part 1 American National Standard for Portable Rechargeable Cell and Batteries – General Specifications (2019)

NEMA C18.2M, Part 2 American National Standard for Portable Rechargeable Cell and Batteries – Safety Standard (2021)

NEMA C18.3M, Part 1 American National Standard for Portable Lithium Primary Cell and Batteries – General Specifications (2019)

NEMA C18.3M, Part 2 American National Standard for Portable Lithium Primary Cell and Batteries – Safety Standard (2021)

NEMA WD 6 Wiring Devices – Dimensional Specifications (2016) NEMA Z535.1 American National Standard for Safety Colors (2017) NEMA Z535.2 American National Standard for Environmental and Facility

Safety Signs (2017)

(Copies of these documents are available online at www.nema.org)

National Fire Protection Association (NFPA)

NFPA 70 National Electric Code 2020 Edition (2019) (Copies of this document are available online at www.nfpa.org) http://www.ipc.org/ http://www.iec.ch/ http://www.nema.org/ http://www.nfpa.org/

SAE International

AMS-STD-595 Colors Used in Government Procurement (2015) AMS-C-9084 Cloth, Glass, Finished, For Resin Laminates (1999)

(Copies of this document are available at http://www.sae.org)

Underwriters Laboratories Inc. (UL)

UL 268 Standard for Smoke Detectors for Fire Alarm Systems (2016)

UL 489 Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures, Edition 13 (2016)

UL 900 Standard for Safety Air Filter Units, Edition 8 (2015) (Copies of these documents are available online at www.ul.com)

2.4 Order of Precedence

In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

http://www.sae.org/ http://www.ul.com/

3. REQUIREMENTS

The requirements of this specification are applicable to both the CVOR and DVOR configurations unless explicitly stated otherwise.

3.1 General Requirements

3.1.1 System Characteristics

3.1.2 VOR Antenna Compatibility

The VOR shall operate with the CVOR or DVOR antenna systems using interconnecting cables up to a maximum length of 500 ft. See Figure 3-1 below for the CVOR block diagram and Figure 3-2 for the DVOR block diagram.

LEGEND

AC Alternating Current NW Northwest DC Direct Current MDT Maintenance Data Terminal Hz Hertz SE Southeast USB Upper Sideband SW Southwest LSB Lower Sideband RMM Remote Maintenance Monitoring NE Northeast RMLS Remote Monitoring and Logging System

FIGURE 3-1. VOR Block Diagram With CVOR Antenna System

LEGEND

AC Alternating Current MDT Maintenance Data Terminal DC Direct Current RMM Remote Maintenance Monitoring fc Carrier Frequency RMLS Remote Monitoring and Logging System LSB Lower Sideband USB Upper Sideband

FIGURE 3-2. VOR Block Diagram With DVOR Antenna System

3.1.3 Integrity of Signal

3.1.4 Assigned Channel Assurance

3.1.5 Accuracy

The ground station contribution to the error in the bearing information conveyed by the horizontally polarized radiation from the VOR for all elevation angles between 0 degrees and 60 degrees, measured from the center of the VOR antenna system, shall be within ±2 degrees [MVP].

3.1.6 Environmental Operating Conditions

Unless otherwise stated, all requirements of this specification shall be met over the full range of service conditions appropriate for the equipment described. The following VOR operating and non-operating environmental condition requirements were derived from MIL-STD-810.

3.1.6.1 Non-Operating Conditions

3.1.6.1.1 Non-Operating Temperature Range

The VOR System packaged for storage, shipping, or transporting (non-operating) shall withstand a temperature range of -46°C to +71°C.

3.1.6.1.2 Non-Operating Altitude

The VOR System packaged for storage, shipping, or transporting (non-operating) shall withstand atmospheric pressure of 575 to 1025 mbar (equivalent to approximately 15 000 ft above sea level in a standard atmosphere down to approximately 300 ft below sea level).

3.1.6.1.3 Vibration

The VOR System shall not be damaged when subjected to the vibrations listed in Table 514.8C-I, Method 514.8 Annex C of MIL-STD-810, and the exposure duration provided in Annex C paragraph 2.1.4.

3.1.6.1.4 Shock

The VOR System shall not be damaged when subjected to the mechanically induced shock as specified in Method 516.8, Procedure II of MIL-STD-810.

3.1.6.2 Operating Conditions

3.1.6.2.1 Outdoor Temperature

All outdoor equipment shall operate in the temperature range of -46°C to +50°C.

3.1.6.2.2 Indoor Temperature

All indoor equipment shall operate in the temperature range of -10°C to +50°C.

3.1.6.2.3 Rain

All outdoor equipment shall operate while exposed to wind-blown rain, at a rate of 1.7 mm/minute (4 inches/hour), and up to 18 m/s (40 mph) blowing wind.

3.1.6.2.4 Operating Altitude

All indoor and outdoor equipment shall operate over the atmospheric pressure range of 700 to 1025 mbar (equivalent to approximately 10 000 ft above sea level in a standard atmosphere down to approximately 300 ft below sea level).

3.1.6.2.5 Wind Velocity

The VOR antenna system shall operate in wind conditions up to 100 mph velocity.

3.1.6.2.6 Ice Loading

The VOR antenna system shall withstand up to 0.5 inches accumulation of clear ice on all outdoor components.

3.1.6.2.7 Humidity

3.1.6.2.8 Fine Sand (Dust)

The outdoor equipment shall be impervious to sand and dust intrusion, as described in 4.4.1.2.7.

3.1.6.3 Lightning Protection

The electronic equipment shall be provided with devices that protect against atmospheric electricity and transients from nearby lightning strikes in accordance with FAA-STD-019 [MVP].

3.1.7 Electromagnetic Interference (EMI) / Electromagnetic Compatibility (EMC)

3.2 Transmitter Requirements

3.2.1 Operating Channels

3.2.1.1 Channel Frequency and Stability

3.2.1.2 RF Tuning

3.2.2 Carrier Transmitter

3.2.2.1 Transmitter Power Output

3.2.2.2 Carrier Output Level and Control

3.2.2.3 Carrier Power Stabilization

After 1 minute of power being applied to the transmitter, and within 6 s of being switched to operational mode, the transmitter output power shall be at least 90% of the nominal output [MVP].

3.2.2.4 Carrier Modulation

3.2.2.4.1 Modulation Levels

The following AM levels for the radiated signal shall be established and maintained within ±1%

[MVP]:

3.2.2.4.2 Output Signal Spectrum

Spurious radiation components within the specified frequency bands on both sides of the carrier signal frequency shall not exceed the levels tabulated in the following paragraphs for the modulation type and levels indicated. Except as noted below, all harmonics and spurious radiation greater than 63 kHz removed from the assigned frequency shall not exceed 50 mW.

3.2.2.4.3 Reference Modulation

The transmitter shall be capable of amplitude modulation to a depth of 80% [MVP].

3.2.2.4.3.1 CVOR 9960 Hz Amplitude Modulation

Frequency Band Level Below Fundamental

1. 9960 Hz (reference) 0 dB

2. 15 kHz through <18 kHz 15 dB

3. 18 kHz through <27 kHz 32 dB

4. 27 kHz through <37 kHz 52 dB

5. 37 kHz and above 62 dB

3.2.2.4.3.1.1 9960 Hz Mean Frequency Stability The mean frequency (see 6.1.15) of the 9960 Hz FM subcarrier signal shall be 9960 Hz ±0.1%

[MVP].

3.2.2.4.3.1.2 Subcarrier Phase Control and Stability

3.2.2.4.3.1.3 9960 Hz Frequency Modulation

3.2.2.4.3.1.4 9960 Hz Level and Stability The level and stability of the 9960 Hz signal shall fulfill the requirements of subparagraph 3.2.2.4.1.

3.2.2.4.3.1.5 9960 Hz Amplitude Modulation Amplitude modulation of the 9960 Hz signal due to frequency deviation shall not exceed a value of 2.0%.

3.2.2.4.3.2 DVOR – 30 Hz Amplitude Modulation

Frequency Level Below Fundamental

1. 30 Hz (reference) 0 dB

2. 60 Hz 32 dB

3. 90 Hz 50 dB

4. 120 Hz 60 dB

5. Beyond 120 Hz 60 dB

3.2.2.4.3.2.1 30 Hz Mean Frequency Stability The mean frequency (see 6.1.15) of the 30 Hz AM signal shall be 30 Hz ±0.01% [MVP].

3.2.2.4.3.2.2 DVOR – Phase Control and Stability

An adjustable phase control shall be provided to permit setting of the zero crossover of the

30 Hz signal with respect to the center of the interval of time during which the upper sideband (USB) signal is fed to the first antenna output (No. 1) of the distributor [MVP].

[MVP]

For any initial setting of the phase adjust control in a. above, the variation of the zero crossover of the 30 Hz amplitude modulated carrier signal with respect to the distributor switching sequence described in 3.2.4.1 shall not exceed ±0.2 degrees of the 30 Hz signal

[MVP].

3.2.2.4.4 Identification Modulation

3.2.2.4.4.1 1020 Hz Frequency Stability The stability of 1020 Hz frequency shall be within ±0.5% [MVP].

3.2.2.4.4.2 Harmonic Distortion

The total harmonic distortion of the 1020 Hz audio signal (continuous tone output) shall not exceed

3.0% [MVP].

3.2.2.4.4.3 Output Level and Stability

3.2.2.4.4.4 Identification Keying

3.2.2.4.4.4.1 Identification Keying Source

3.2.2.4.4.4.2 Identification Keying Control

The transmitter shall provide controls to [MVP]:

3.2.2.4.4.4.3 Identification Signal Characteristics

3.2.2.4.5 Voice Modulation

3.2.2.4.5.1 Dry Circuit Input

Ω with a 600 Ω input impedance

3.2.2.4.5.2 Voice Over Internet Protocol

selectively, either internet protocol (IP) version 4 (IPv4) or IPv6

This VoIP interface (b.) shall be a separate connection than that described in 3.5.10.

3.2.2.4.5.3 Voice Input and Modulation Circuitry

3.2.2.4.5.4 Automatic Gain Control

3.2.2.4.5.5 Audio Response

The voice frequencies transmitted by the carrier amplifier shall be limited by the voice amplifier response and filtering techniques to conform to these characteristics [MVP]:

Frequency Range Response 300 Hz – 3000 Hz Flat to within 1.5 dB (except 1020 Hz see 3.2.2.4.5.6).

Below 300 Hz

Above 3000 Hz

Note: These requirements are imposed to ensure non-interference with the navigation signals, 30 Hz, 1020 Hz, and 9960 Hz.

3.2.2.4.5.6 Identification Notch Filter

3.2.2.4.5.7 Amplifier Gain

The overall gain of the voice frequency amplifier (including gain control circuitry and any fixed gain circuits) shall be sufficient to provide amplitude modulation of the carrier signal (not to exceed 30%), when the power output is 150 W [MVP].

3.2.3 Sideband Output Characteristics

3.2.3.1 Conventional Sideband Characteristics

Note: These RF double sidebands are combined in the VOR antenna system in a manner such that a 30 Hz amplitude modulated carrier signal is produced (nominal amplitude modulation is 30%).

3.2.3.1.1 Sideband Output Power Control

3.2.3.1.2 Carrier Frequency Suppression

The carrier frequency component present within each sideband RF output shall not exceed a level which is 30 dB below the power level of each sideband output.

3.2.3.1.3 30 Hz Harmonic Distortion The total harmonic distortion of the 30 Hz envelope shall not exceed 1.0% [MVP].

3.2.3.1.4 Output Signal Spectrum

Frequency Band Level Below Reference Upper sideband (USB) (fc +30 Hz) 0 dB (reference) Lower sideband (LSB) (fc -30 Hz) 0 dB (±0.1 dB) Carrier (fc) 30 dB (3.2.3.1.2) Second harmonic (fc ±60 Hz) 30 dB (balanced within 1 dB) Third harmonic (fc ±90 Hz) 30 dB (balanced within 2 dB) Fourth harmonic (fc ±120 Hz) 40 dB (balanced within 2 dB) Fifth harmonic (fc ±150 Hz) 40 dB (balanced within 2 dB) All higher order harmonics of 30 Hz 50 dB

3.2.3.1.5 Output Envelope Symmetry

The audio phase relationship of the two outputs shall be in phase quadrature, 90 ±2 degrees [MVP].

Note: The correct separation of the zero points of both output envelopes will address 3.2.3.1.4 carrier (fc) suppression requirement.

3.2.3.1.6 RF Phase

3.2.3.1.7 Deviation from Average Maximum Envelope Amplitude

For one complete period of the 30 Hz modulation signal, any individual maximum envelope amplitude, at both the outputs, shall not deviate by more than 0.5% from the average of all such maximums (averaged over a period of at least five complete cycles of 30 Hz) [MVP].

3.2.3.1.8 Output Circuit Loading

3.2.3.1.9 Sideband Power Stabilization

After one minute of power being applied to the transmitter, and within 6 s of being switched to operational mode, the sideband output power shall be at least 90% of the nominal output [MVP].

3.2.3.1.10 Power Output Measurement

Directional couplers and detectors shall be incorporated at each sideband output for measurement of forward and reverse power and VSWR, for display locally and remotely [MVP].

3.2.3.2 Doppler Sideband Characteristics

The DVOR sideband transmitter shall provide two sideband outputs that are nominally 9960 Hz above and 9960 Hz below the frequency of the VOR carrier transmitter, respectively [MVP].

3.2.3.2.1 Sideband Output Power Control

3.2.3.2.2 Output Frequencies

3.2.3.2.3 Output Phase

3.2.3.2.4 Stabilization and Response Time

After one minute of power being applied to the transmitter, and within 6 s of being switched to operational mode:

3.2.3.2.5 Sideband Modulation

Note: The modulation may be applied in the sideband transmitters.

3.2.3.2.6 Output Signal Spectrum

Spurious radiation components within specified frequency bands on either side of the fundamental shall not exceed the following levels [MVP]:

Frequency Band Level Below Fundamental

a. 15 kHz through <18 kHz 15 dB

b. 18 kHz through <27 kHz 32 dB

c. 27 kHz through <37 kHz 52 dB

d. 37 kHz and above 62 dB

3.2.3.2.7 Carrier to Sideband Isolation

The level of the carrier reference frequency in the output of either sideband output signal shall be at least 34 dB below the level of the sideband output signal [MVP].

3.2.3.2.8 Cross-Channel Isolation

3.2.3.2.9 Power Output Measurement

Directional couplers and detectors shall be incorporated at each sideband output for measurement of forward and reverse power and VSWR for display locally and remotely [MVP].

3.2.4 Doppler VOR Distributor Assembly

The DVOR distributor assembly is used to provide sequential electronic switching of the DVOR sideband transmitter outputs in a counterclockwise direction, when viewed from above, to the circular array of 48 or 50 sideband antennas at the rate of 30 Hz [MVP].

3.2.4.1 Distributor Function

3.2.4.2 Insertion Loss

3.2.4.3 RF Phase Shift

The RF phase shift shall be within ±5.0 degrees for each sideband channel, as measured from the distributor input to each of the corresponding distributor sideband antenna output connectors.

3.2.4.4 Switching Isolation

3.2.4.5 Distributor Mechanical Design

Note: An open-design architecture is acceptable for the stand-alone rack in b. above.

3.2.5 CVOR Carrier, DVOR Carrier, and DVOR Sideband Antennas

The requirements provided in this section (3.2.5) are applicable to Alford loop style antennas and antenna equipment.

3.2.5.1 CVOR Transmitting Antenna Sets [MVP – VOR compatibility is required] Each antenna equipment set shall include the following:

Note: The VOR Antenna Mounting Plate Locking Wedge is to be inserted into the gap between the 5-inch hole in the antenna support plate and the 4-inch (OD) pipe of the polarizer pedestal for the purpose of permanently maintaining the polarizer pedestal centered position and be resilient to the extent that "rattling" cannot occur when the polarizer pedestal is vibrated moderately.

3.2.5.2 DVOR Sideband Antennas [MVP – VOR compatibility is required]

Note: The number of DVOR sideband antennas will be either 48 or 50 depending on the design.

Drawing D-5615, bracing kit, is particular to a DVOR with 50 sideband antennas and will be adjusted to accommodate a DVOR design with 48 sideband antennas.

3.2.5.3 DVOR Carrier Antenna [MVP – VOR compatibility is required]

3.2.5.4 Fastener Materials

Except where otherwise specified, all screws, nuts, and washers shall be stainless steel and comply with 3.7.19.3.

3.2.5.5 RF Connectors

Each antenna assembly shall be provided with 3 type UG-58A/U receptacles for connection of the balance-to-unbalance transformer and the RF input cable.

3.2.5.6 Balance-to-Unbalance Transformers

3.2.5.7 Antenna Nameplate

3.2.5.8 Antenna Insulators

Antenna insulators shall meet the following detailed requirements: Insulators per DE-B-2611-1 DE-B-2611-3, and DE-A-2611-4.

3.2.5.9 Capacitor Plates

3.2.5.10 DVOR Antenna Pedestal Cover

3.2.5.11 Antenna Finishes

3.2.5.11.1 Silver Plating

3.2.5.11.2 Aluminum Parts

3.2.5.12 Mechanical Tolerances

3.2.5.12.1 Antenna Element Edge Tolerance

When the antenna assembly is placed with the element edges (which are farthest from the supporting cross) in contact with a plane surface, the edges of each element (including the folded rectangular portions) shall not be displaced from the plane surface by more than 0.010 inch.

3.2.5.12.2 Antenna Element Perpendicularity

The elements shall be perpendicular to the plane surface referred to in 3.2.5.12.1 within 0.010 inch over span of 4 inches.

3.2.5.12.3 Opposing Element Alignment

3.2.5.12.4 Adjacent Element Alignment

Adjacent elements of an antenna assembly shall be at right angles within 0.015 inch over a span of 16 inches.

3.2.5.12.5 Pedestal Perpendicularity

When either flange of an antenna pedestal (B-50400) is placed on a plane surface, the centerline of the pedestal shall be perpendicular to the surface within 0.060 inch over the span of the length of the pedestal.

3.2.5.12.6 Tapered Transformer Section Alignment

3.2.5.12.7 Folded End Alignment

3.2.5.12.8 Capacitor Alignment

Each plate of the loop antenna capacitors shall be coplanar with the tapered transformer section (on which it is mounted) within 0.010 inch.

3.2.5.13 Electrical Performance

3.2.5.13.1 CVOR Antenna Input Impedance

3.2.5.13.2 DVOR Antenna Input Impedance

The antenna input impedance shall be such that the VSWR does not exceed 2.5:1 at 113 MHz.

3.2.5.14 Insulation Resistance

The insulation resistance of the complete antenna, with the balance-to-unbalance transformer connected as required in 3.2.5.6, shall be at least 50 MΩ.

3.2.5.15 CVOR Antenna Shelter

The CVOR antenna shelter shall conform to each of the following:

3.2.5.15.1 CVOR Antenna Shelter Materials

3.2.5.15.2 CVOR Antenna Shelter Fabrication and Finishes

3.2.6 Thermal Overload Protection

3.2.7 Performance Upon a Fault Condition of RF Equipment Output Circuit

3.3 Monitor

Note: In the event that more than one independent monitor is used, the requirements in 3.3 apply to each independent monitor.

3.3.1 Operating Channels

3.3.1.1 Broadband Operation

One single design shall be utilized for each RF device to cover operation on any selected channel.

3.3.1.2 RF Tuning

The monitor receiver shall be capable of operating on any channel assignment without the need for retuning.

3.3.1.3 Frequency and Accuracy Stability

The center frequency of the monitor receiver input shall not vary more than ±0.001% from the assigned frequency.

3.3.1.4 RF Input Levels

All monitor performance requirements shall be met when the VOR transmitter output power is between 25 W and 150 W.

3.3.1.5 Input Interference Immunity

Where:

N1 and N2 are the levels (dBm) of the two VHF FM sound broadcasting signals at the VOR receiver input that produce, within the receiver, a two-signal, third-order intermodulation product on the desired VOR frequency; and

Δf = (108.1 – f1), where f1 is the frequency of the signal that has the level N1, the VHF FM sound broadcasting signal closer to 108.1 MHz.

Frequency (MHz)

Maximum level of unwanted signal at receiver input

(dBm) 88 – 102 +15 104 +10 106 +5

107.9 -10

Note: The relationship is linear between adjacent points designated by the frequencies in c.

above.

3.3.1.6 RF Input Connections

The signals from the monitor antennas shall be applied to Threaded Neill–Concelman (TNC) receptacles at the top of the equipment cabinet.

3.3.1.7 Detected Audio Output Channel

3.3.1.7.1 Headphone Output

3.3.1.7.2 Level Control

3.3.1.7.3 Effect on Monitored Signal Components

Adjustment of the AUDIO LEVEL control, throughout the entire range, shall not change:

3.3.2 VOR Monitor Operation

3.3.2.1 Monitor Alarm Action

3.3.2.1.1 Primary Alarm

If any primary parameter (3.3.2.2.1), or if any parameter listed in 3.3.2.2.2 that is selected as primary, produces an out-of-tolerance condition, the monitor will cause the following actions to take place [MVP]:

3.3.2.1.2 Secondary Parameter Alert

If any of the monitored parameters set to secondary (3.3.2.2.2) produces an out-of-tolerance condition, the monitor shall cause a positive visual and aural indication of the alert condition

(3.4.1.2) [MVP].

3.3.2.1.3 Pre-Alarm

If any monitored parameter exceeds the pre-alarm limit, a maintenance alert shall be generated.

3.3.2.1.4 Maintenance Alert

3.3.2.1.5 Alarm Delay Time

3.3.2.1.6 Monitor Response Time

3.3.2.2 Monitored Parameters

3.3.2.2.1 Primary Parameters

The following parameters shall be monitored as primary alarms [MVP]:

3.3.2.2.2 Primary or Secondary Parameters

The following parameters shall be monitored and selectable as either primary parameter alarms or secondary parameter alerts [MVP]:

3.3.2.2.3 Azimuth Indication

3.3.2.2.4 30 Hz Modulation

3.3.2.2.5 FM Subcarrier Modulation

3.3.2.2.6 FM Subcarrier Frequency Deviation

3.3.2.2.7 Transmitter Power Output

3.3.2.2.8 Radiated Power Level

3.3.2.2.9 Identification Keying

3.3.2.2.10 Identification Modulation

3.3.2.2.11 Transmitter Frequency

3.3.2.2.12 DVOR Sideband Signal Accuracy Monitoring

3.3.2.3 Test Signals and Monitoring Activities

The following test results shall be available through the MDT and the Remote Monitoring and Logging System (RMLS) interface.

3.3.2.3.1 Transmitter Certification Tests

3.3.2.3.2 Monitor Alarm Limit Certification Tests

3.3.2.4 Monitor Failsafe

The monitor shall be failsafe such that failure of any part of the monitor subsystem, including any associated control action (transmitter shutdown), either results directly in an alarm condition, or does not alter any alarm limit to allow an out-of-tolerance condition to occur without detection

[MVP].

3.3.2.5 VOR Test Generator

3.3.2.5.1 Frequency Modulation Signal

3.3.2.5.1.1 FM Subcarrier Frequency

Note: The increasing 9960 Hz frequency represents the positive going 30 Hz excursion.

3.3.2.5.1.2 30 Hz FM Signals

3.3.2.5.1.3 Harmonic Distortion

The total harmonic distortion of the 30 Hz FM signal shall be less than 0.5% [MVP].

3.3.2.5.1.4 FM Output Level Adjustments

The FM subcarrier signal output level shall be adjustable in steps of 0.5% amplitude modulation over the range of 15% to 45% modulation [MVP].

3.3.2.5.1.5 FM Output Level Stability

The output level shall not vary by more than ±0.2% for any setting of the output level (3.3.2.5.1.4)

[MVP].

3.3.2.5.1.6 Hum Distortion

The root mean square (rms) of all hum distortion frequencies shall not exceed a value corresponding to 65 dB below the specified minimum output level (3.3.2.5.1.4) [MVP].

3.3.2.5.2 30 Hz Amplitude Modulation Signal

3.3.2.5.2.1 AM Signal Phase

The nominal phase of the sinusoidal 30 Hz AM signal shall be within ±0.05 degrees of the phase of the 30 Hz FM signal (3.3.2.5.1.2) at any azimuth setting [MVP].

3.3.2.5.2.1.1 30 Hz AM Output Level Adjustments The 30 Hz AM signal output level shall be adjustable in steps of 0.5% modulation, from 15% to 45% modulation [MVP].

3.3.2.5.2.1.2 Amplitude Distortion of the FM Signal

The amplitude distortion of the 9960 Hz FM signal shall be less than 2% when all other modulation is removed [MVP].

3.3.2.5.3 Connection to External Test Equipment

The VOR test generator shall provide a connector as appropriate for the frequency of operation for connection to external test equipment (GFE) [MVP].

3.3.2.6 CVOR Ground Check System

3.3.2.6.1 Input Signals

Except as otherwise specified, the monitor equipment shall meet all performance requirements with the monitor antenna operated in a horizontally polarized RF field, with a field intensity of 0.3 V/m to 3.0 V/m, and the characteristics and modulation components specified in 3.2.2.4.

3.3.2.6.2 Ground Check

Note: The nominal routine frequency and range of adjustability in d. above will be determined by the outcome of the system safety assessment.

3.3.2.6.3 Ground Check Results

3.3.2.6.4 Ground Check Alarm Conditions

3.3.2.6.5 Monitor Antennas

3.3.2.6.5.1 Broadband Characteristics

3.3.2.6.5.2 Phase Balance

The measured azimuth from the monitor antenna output shall not differ by more than 0.1 degrees when installed in the standard position and rotated 180 degrees from standard [MVP].

3.3.2.6.5.3 Polarization

3.3.2.6.5.4 Antenna Mast

3.3.2.6.5.4.1 Mast Surface

3.3.2.6.5.4.2 Mast Cable Slot

3.3.2.6.5.4.3 Cable Clamp

Strain relief shall be provided within the monitor antenna housing or mast to prevent damage to the cables.

3.3.2.6.5.5 Antenna Radome

3.3.2.6.5.6 Monitor Antenna Extension Mast

3.3.2.6.5.7 Monitor Antenna/Monitor Interconnecting Cables

The monitor shall meet performance requirements with [MVP]:

3.3.2.6.5.8 Monitor Antenna System Re-radiation Limit

The azimuth error introduced by the monitor antenna system (inclusive of all 16 monitor antennas and mounting hardware) shall be less than ±0.2 degrees [MVP].

3.3.2.7 DVOR Field Monitoring

The Doppler VOR monitor shall meet all performance requirements with an RF input signal as otherwise specified herein supplied from a 50 Ω source at amplitudes between -19 dBm to +7 dBm (3.2.2.2-a).

3.3.2.7.1 DVOR Field Monitor Antenna

The DVOR monitor antenna shall be provided and conform to the following characteristics:

3.3.2.8 Transmission Line Directional Coupler

3.4 Control, Status and Indicator Functions

3.4.1 Front Panel

3.4.1.1 Controls

As a minimum, the following control functions shall be available from the front panel of the VOR transmitter:

3.4.1.2 Status and Indicators

3.4.2 Maintenance Data Terminal (MDT)

3.4.3 Remote Control

Remote controls shall only be allowed when enabled from either the front panel or the MDT. See

3.5 for remote control function details.

3.4.4 Fault History

3.4.5 Fault Diagnostics

3.4.6 Trend Analysis Data Collection and Storage

3.4.7 Automatic Reset Function

The VOR transmitter automatic reset function shall [MVP]:

3.5 Remote Maintenance Monitoring (RMM)

RMM consists of the various sensors, microprocessor(s), and software necessary to remotely monitor, control, record, and certify proper operation of the VOR System to be furnished under this specification.

3.5.1 Remote Monitoring Subsystem (RMS)

3.5.1.1 RMS Functions

The VOR RMS shall provide the following functions [MVP]:

3.5.2 Alarm and Alert Messages

3.5.2.1 Alarms

3.5.2.2 Maintenance Alerts

3.5.3 Non-Volatile Data Storage

3.5.4 RMS Data Sampling Rate

The RMS shall sample each parameter within the RMS and VOR monitor(s) no less frequently than once every second.

3.5.5 Spare Input/Output Capacity

3.5.6 Environmental Monitoring

3.5.6.1 Intrusion Detector

3.5.6.2 Smoke Detector

3.5.6.3 Obstruction Light Sensor

3.5.6.4 AC Power Sensor

3.5.6.5 Temperature Sensors

3.5.7 RMS Security

Log-on security shall be implemented to ensure that only authorized personnel can enter RMS commands.

3.5.7.1 Security Implementation

The RMS security design shall:

3.5.7.2 Security Level Definitions

Security levels for the RMS are defined as follows:

Ramsey, Ellin S-CTR (FAA) Correct VRTM from 15 to 20

3.5.8 RMS Data and Control Filtering

3.5.9 RMS Failure Protection

The VOR System design shall employ a failsafe mechanism such that failures in the RMS function cannot cause a loss or degradation of navigation service to the user.

3.5.10 Interface with RMM Subsystems

3.6 Data Security

3.6.1 Access Control

The VOR System shall contain features in its design and operation that prevent unauthorized and disruptive access to the system by implementing the following requirements as a minimum [MVP]:

3.6.2 Audit Logging

3.7 VOR System Design Characteristics

3.7.1 Maintainability

3.7.1.1 Real Time Clock/Calendar

e.

f. The system shall include a clock battery with built-in charging that is capable of maintaining the local system time for at least 180 days.

3.7.2 Reliability

3.7.3 Modular Construction

3.7.3.1 Equipment Mounting

3.7.4 Test Points

3.7.5 Interchangeability

3.7.6 Corrective Maintenance

The following time requirements assume the following: A single maintenance technician performs the repair; the technician has had adequate equipment-specific training; the repair work is performed under normal conditions in the equipment shelter; and a full set of spares and necessary tools are located at the shelter.

3.7.7 Preventative Maintenance

3.7.8 Software/Firmware Updates

3.7.9 Electrical Interfaces Between VOR, Monitor Antennas, and Distributor

3.7.10 RF Input/Output Connectors

3.7.11 Grounding and Bonding

3.7.12 Input Power

3.7.12.1 AC Power

3.7.12.2 Equipment Directly Connected To Line Power

3.7.12.3 Power Plugs, Cords, and Outlets

The VOR System shall include one 20 A, 125 VAC, NEMA WD 5 grounding duplex receptacle, installed and wired in accordance with the requirements of NFPA-70.

3.7.12.4 Leakage Currents

Leakage current shall be less than 5 mA [MVP].

3.7.12.5 Power Factor

3.7.12.6 Inrush Current

FIGURE 3-3. Inrush Current Limit Ratios

3.7.12.7 Harmonic Distortion

The system shall meet the current harmonic distortion requirements stated in International Electrotechnical Commission (IEC) 61000-3-2:2018 [MVP].

3.7.12.8 Circuit Overload Protection

3.7.12.9 Input Power Conditions

The system shall operate within tolerance when the AC input power varies according to the following [MVP]:

3.7.13 DC Power

The system shall be capable of operation from a facility battery power source (GFE) that provides

33–56 VDC [MVP].

3.7.13.1 Transformer Isolation of Non-Switching DC Power Supplies

3.7.14 Removable Parts and Mating Connectors

3.7.15 Electronic Equipment Assembly Requirements

3.7.15.1 Component Mounting

Component mounting shall be in accordance with IPC-CM-770 or ANSI/IPC-SM-780, as applicable, except the term “not recommended” shall be interpreted as “reject.”

3.7.15.2 Printed Circuit Boards

Printed circuit boards shall be in accordance with IPC-A-600K.

3.7.15.3 Assembly

Assembly shall be in accordance with ANSI/IPC-A-610 and IPC J-STD-001.

3.7.15.4 Wire Wrap

Wire wrap shall not be used.

3.7.16 Shelf Life

Materials, packaging, and processes shall ensure the equipment will meet performance requirements after a period of two years in a non-operational state after FAA acceptance.

3.7.17 Accessibility

3.7.17.1 General

3.7.17.2 Enclosures

3.7.17.3 Maintenance Access

3.7.18 Thermal Design

3.7.19 Materials Processes and Parts

3.7.19.1 Dissimilar Metals

3.7.19.2 Metals, Corrosion Resistance

3.7.19.3 Corrosion-Resisting Ferrous Alloys

3.7.19.4 Flammable Materials

Materials used in the end item configuration shall be noncombustible, fire retardant, or self-extinguishing in the most hazardous conditions of the equipment environment.

3.7.20 Equipment Manufacturing Processes

3.7.20.1 Strain Relief

Each part lead terminating at a connection point shall allow for strain relief to minimize tensile or shear stress.

3.7.20.2 Painted Finish

3.7.21 Electrical Parts

3.7.21.1 Batteries

3.7.21.2 Overcurrent Devices

3.7.21.2.1 Circuit Breakers

3.7.21.2.2 Fuses

3.7.21.3 Connectors with Thermocouple Contacts

3.7.21.4 Electrical Power Connectors

3.7.21.5 Switches

Switches shall maintain their indicated state, i.e., open or closed, when subjected to any accidental force on the switch or the switch mounting equivalent to a 10g acceleration of either switch or mounting.

3.7.21.6 Wiring

The selection, application, and wiring practices for cable and wire shall be in accordance with the following subparagraphs.

3.7.21.6.1 Wiring – Electrical Clearance and Leakage Current

Clearance between solder connections or bare conductors (such as terminal strips, stand-offs, or similar connections) shall not allow accidental contact between adjacent connections when subject to service conditions specified in this specification.

3.7.21.6.2 Wiring – Marking

All signal, control, and power wiring shall be uniquely identified to and within the enclosure along the wire and at each termination by either permanent insulation markings or by heat shrink labels.

3.7.21.6.3 Wiring – Protection

3.7.21.6.4 Wiring – Bend Radius

The bend radius of wire and cable shall be greater than or equal to five times the cable diameter to avoid establishing a permanent set in the cable.

3.7.21.6.5 Wiring – Sleeving

3.7.21.6.6 Wiring – Panel Door Cables

Wiring to parts on a hinged door shall be contained in a minimum number of cables, arranged to flex without becoming damaged when the door is opened and closed.

3.7.21.6.7 Wiring – Through Hole Protection

3.7.21.6.8 Wiring – Arrangement

3.7.21.6.9 Wiring – Slack

Discretely terminated wires and cables shall be as short as practicable and still allow for maintenance and operation without damage or crimping of the wires.

3.7.21.6.10 Wiring – Entrance Cabling

Wiring from cable entrances to terminal boards, plugs, jacks, and similar devices shall be harnessed and clamped or supported in a cable duct.

3.7.21.6.11 Wire

3.7.21.6.12 Wiring - Fungus Protection

Materials that support fungus growth shall not be used for wiring or wiring insulation.

3.7.21.6.13 Wiring - Aluminum Conductors

Aluminum conductors shall not be…