Evenlode Air Data Terminal

Evenlode Air Data Terminal Equipment

  • Evenlode is a modular, lightweight transceiver based on six distinct modules: transceiver, upconverter, 10 W Radio Frequency (RF) amplifier, heat exchange, power supply module and video/ audio encoder. These six modules together with antennas, output transmission isolation filter and receive Low Noise Block downconverters make up a complete Evenlode system. The system has integrated Advanced Encryption Standard (AES) 256-bit (subject to export license) or Substitution Cipher Encryption. The uplink receiver and downlink transmitter are contained in a single transceiver module.

Product Description

Since the introduction of Video down links, customers using COFDM-based systems have been demanding more customization and functionality. Air platform users, particularly those in aviation, require their equipment to comply with DO-160 certification, which involves testing for environmental conditions. Furthermore, military customers have specific requirements for increased link robustness, security protocols such as encryption, and minimal failure rates.

To meet the evolving needs of air platforms, ECS has adapted its Evenlode product family. This adaptation caters to helicopters, which demand video down links that are smaller, lighter, consume less power, and offer greater range and capability. As a result, ECS can now provide interoperability between rotary and fixed-wing aircraft as well as unmanned platforms used in remote sensor roles.

ECS has chosen COFDM as the underlying technology for its down links. COFDM offers extended range, sufficient bandwidth for military and security operations, and a cost-effective solution through the Air Data Terminal installed in aircraft.

The product and system design process at ECS follows industry and military standards, including the Design Approved Organization Scheme (DAOS). ECS obtained DAOS certification during its initial audit and has maintained certification ever since. The Evenlode system has also successfully completed the RTCA DO-160-G specification, allowing easy installation of the Air Data Terminal in aircraft. If needed, ECS can collaborate with aerospace design and installation companies to retrofit the Evenlode Air Data Terminal to existing airframes.

The standard Evenlode transceiver utilizes two receive antennas to enable diversity reception. Uplink data serves various purposes such as UAV control, switching between different sensor inputs, camera control, and downlink parameter control. Downlink data is transmitted through Ethernet and Asynchronous Serial Interface (ASI) inputs. The ASI input can come from an external Video Audio Encoder Module (VEM), which includes two internal video encoders capable of encoding two video signals chosen by the operator from four HD and two Standard Definition (SD) inputs. ASI and Ethernet data rates can be independently adjusted.

Evenlode can act as an Ethernet bi-directional network repeater and is compatible with all ECS video equipment. For minimal video delays (less than 140 ms), there is an option for a low latency video encoder/decoder. ECS offers a wide range of ground receiving systems and transceivers that can integrate with Evenlode, including fixed, vehicle-borne, briefcase, and handheld receivers and transceivers. The Evenlode ground data terminal contains a Video/Audio Decoder Module in the same configuration as the air Video/Audio Encoder Module. Additionally, ECS provides various ground station options, such as omnidirectional, diversity, sector tracking, multi-input diversity, and high-gain GPS tracking.

Technical Specifications

130 mm x 126 mm x 218 mm, 3 kg approx

Power Requirements
135 W typ (LBand) 11-15, 22-30 VDC

1.2 – 6.4 GHz; uplink and downlink channel set each within 10% proportional bandwidth. Isolation between channel sets

Link Mode Selection
FEC – 1/2, 2/3, 3/4, 5/6
Guard interval – 1/4, 1/8, 1/16
Modulation – QPSK, 16QAM
Channel bandwidth – 1.7, 2, 3, 4, 5, 6, 7, 8 MHz

Link Data Rate
930 kbps – 20.1 Mbps

Data Interfaces
100/10BASE-T Ethernet and, ASI    

Network Description
Bidirectional OSI-layer1 network repeater/2-port hub
Terminals on either side of Evenlode link on the same collision domain
Integral 2-port switch or routing technology to customer requirements

GPS Input
Line-powered GPS active antenna, ARINC429 interface or direct NMEA0183 feed also available
GPS input may also be via ethernet port

Video Formats Supported
AES 256 (subject to export license approval) or substitution cipher encryption

Control Data
Dedicated serial control (system control unit optional) or via ethernet port
The Evenlode air transceiver may also be controlled via the uplink
Control of modulation, guad interval, forward error correction, channel bandwidth, encryption, frequency and power (low/high)

-20° C to +55° C temp, 0-90% rel humidity non-condensing, 25,000 ft altitude operating conditions

Tested to RTCA DO160F and DO160G standards. 

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