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 Video down links were first introduced, customers deploying COFDM based systems as the underlying technology, have demanded increased customization and functionality. Specifically, air platform users require their equipment to comply with DO-160 which is an aviation environmental conditions and test procedures certification. In addition, Military customers demand increased link robustness security protocols such as encryption and very low failure rates.

ECS has adapted its Evenlode product family to suit the evolution of air platforms such as helicopters which, require video down links to be ever smaller, lighter and consume less power, whilst increasing range and capability. This enables ECS to offer interoperability between rotary and fixed wing and unmanned platforms which are being used in the remote sensor role.

ECS has adopted and developed COFDM as its underlying technology for its down links, as the technology offers extendable range, sufficient bandwidth for Military and Security operations, whilst still offering a low operational cost solution from its aircraft-based Air Data Terminal.

The product and system design process within ECS has been developed in-line with industry and military standards and the Design Approved Organization Scheme (DAOS). The Company successfully achieved DAOS certification following their initial audit and has retained certification ever since. The Evenlode system has successfully completed RTCA DO-160-G specification, allowing the Air Data Terminal to be easily installed within aircraft.

ECS can also work with aerospace design and installation companies who retrofit the Evenlode Air Data Terminal to clients existing airframes if required.

The standard Evenlode transceiver is used with two receive antennas providing diversity reception. Uplink data may be used to provide UAV control, switch between different sensor inputs, provide camera control or be used to control downlink parameters. Ethernet and Asynchronous Serial Interface (ASI) inputs are provided for downlink data. The ASI input may be from an external Video www.enterprisecontrol.co.uk Audio Encoder Module (VEM). The VEM has two internal video encoders capable of encoding any two video signals selected by the operator from four HD and two Standard Definition (SD) inputs. ASI and Ethernet data rates are independently controllable. 

Evenlode may behave as an Ethernet bi-directional network repeater and also be compatible with all Enterprise Control Systems Ltd (ECS) video equipment. A low latency video encoder/ decoder option is available providing video delays of <140 ms. ECS supplies an extensive range of ground receiving systems and transceivers capable of integrating with Evenlode. These include fixed, vehicle-borne, briefcase and handheld receivers and transceivers. An Evenlode ground data terminal will contain a Video/Audio Decoder Module in the same configuration as the air Video/Audio Encoder Module. ECS is able to provide omnidirectional, diversity, sector tracking, multi-input diversity and high-gain GPS tracking ground station options.

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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