ARINC 566A-9 : 1998

1.0 INTRODUCTION AND DESCRIPTION
1.1 Purpose of this Characteristic
1.2 Unit Description
1.3 Function of the Equipment
1.4 Interchangeability
1.5 System Parameters
1.6 Applicable Publications, Specifications
     and Reports
1.7 Regulatory Approval
2.0 STANDARDS REQUIRED TO EFFECT
     INTERCHANGEABILITY
2.1 Form Factors and Connectors
2.2 Weight
2.3 Interwiring
2.4 Primary Power Input
2.5 Power Control Circuitry
2.6 Control Panel Wiring
3.0 TRANSCEIVER UNIT DESIGN
3.1 Frequency Range and Channelling
3.2 Frequency Selection
3.3 Transmitter Frequency Offset
3.4 Receiver Sensitivity
3.5 Receiver Selectivity
3.6 Undesired Responses
3.7 Cross Modulation
3.8 Audio Output
3.9 Automatic Gain Control
3.10 Noise Limiters
3.11 Squelch Provisions
3.12 Desensitization and Interference Rejection
3.13 SELCAL Audio Output Provisions
3.14 Receiver Recovery
3.15 Aircraft Electrical Power Characteristics
3.16 Internal Circuit Protection
3.17 Transmitter Frequency Stability
3.18 Transmitter Power Output and Duty Cycle
3.19 Transmitter Sidetone
3.20 Transmitter Spurious Radiation
3.21 Transmitter Microphone Provisions and
     Frequency Response
3.22 Muting Relay
3.23 Test Meter and Switch Provisions
3.24 Microphone and Headphone Jacks on
     R/T Front Panel
3.25 Provisions for Automatic Test Equipment
4.0 TRANSCEIVER UNIT DESIGN FOR THE
     8.33 kHz CHANNEL-SPACED MODE
     OF OPERATION
4.1 Frequency Range and Channeling
4.2 Frequency Selection
4.4 Transmitter Design
5.0 CONTROL PANEL DESIGN
5.1 General Configuration
5.2 Frequency Selection & Display
5.3 Connector Types
5.4 Volume Control
5.5 Master Off-On Control
5.6 Integral Lighting
5.7 Control Function Transfer Switch
6.0 ANTENNAS
6.1 General
6.2 Antenna Considerations for Multiple
     Systems Operations
7.0 PROVISIONS FOR DATA TRANSMISSION
     AND RECEPTION
7.1 Background of the Problem
7.2 Data Link Audio Input to the Transmitter
7.3 Data Link Audio Output
7.4 Data Link Keying
7.5 AGC Characteristics
7.6 Differential Delay
ATTACHMENTS
Attachment 1-1 - Transceiver Unit Connector Locations
Attachment 1-2 - Standard Control Panel Outline Drawing
Attachment 1-3 - Typical VHF Communications Antenna
Attachment 2 - Standard Interwiring
Attachment 3 - Receiver Selectivity
Attachment 4 - Environmental Test Categories
Attachment 5 - Frequency Selector
Attachment 6 - Standard VHF NAV/COM Control Panel Wiring
Attachment 7 - Microphone and Data Inputs and Outputs
Attachment 8 - Test Procedures for Desensitization and
               Interference Rejection
Attachment 9 - 8.33 kHz Receiver Selectivity
Attachment 10 - 8.33 kHz Transmitter Spectrum Mask
Attachment 11 - Combined 8.33/25 kHz Frequency Selection

For several years following its publication in 1961, ARINC Characteristic 546 served to describe the basic VHF communications transceiver system of the airline industry.