COFDM Receiver

English Arabic French Portuguese Spanish
+44 (0) 1327 860050
Enterprise Control System

Diversity Receiver Module

COFDM Diversity Receiver Modules
The VLDR-IF-28 & VLDR-IF-28-HD are receivers designed for installation on rotary and fixed-wing airframes as part of ground-to-air or air-to-air link system. Each receiver uses two antennas in diversity to receive, decode and decrypt Coded Orthogonal Frequency Division Multiplexing (COFDM) signals. The receivers are compatible with the full range of Enterprise Control System Ltd (ECS) ground and air transmitters.
Diversity Receiver Module
  • General Description
  • Technical Data

General Description

A receiver system comprises of: the VLDR receiver with dual Intermediate Frequency (IF) inputs, two air-certified, modular Low Noise Block downconverters (LNB), two omnidirectional antennas and a Remote Control Unit (RCU) as the air operator’s control interface. The system provides ground-to-air or air-to-air reception of video, audio and data. Used in conjunction with an ECS air transmitter, the aircraft can be used as a ground-air-ground rebroadcast unit significantly extending tactical ground link range.
The receiver has a sophisticated channel state indicator system providing an accurate measurement of received signal to noise performance. This system selects the best available information from the dual antenna inputs in real time, on a carrier-by-carrier basis. Diversity operation has been shown to provide a 6-8 dB link budget advantage over an equivalent single antenna receiver system.
The receiver incorporates Substitution Cipher or Advanced Encryption Standard 256-bit decryption. (AES is subject to export license approval). The receiver is frequency band independent having IF inputs.
The High Definition variant: VLDR-HD-IF-28 can receive both Standard Definition (SD) and High Definition (HD) video (1 HD or 1 SD channel dependant on the transmission source). HD quality at 1280 x 720p is compressed using H.264.

Technical Data

Equipment Designation: VLDR-IF-28-XX VLDR-IF-HD-28-XX
XX-Customer System Configuration Number SD Video Output
(Both models): 1 PAL / NTSC CVBS at 1 V pk-pk (programmable)
SD Video Output (VLDR-IF-28-XX only): 1 PAL / NTSC Y/C at 1 V pk-pk (programmable)
HD Video Output: (VLDR-IF-HD-28-XX only):
Interface: 1 HD-SDI (SMPTE 292M-1998)
Resolution: SMPTE 296M-2001
Conforms to ISO/IEC 14496-10 (H.264/AVC).
High Profile Level 4.0. 1280x720p
Audio, Data, GPS: 2 audio MPEG-1 L2 channels (1 stereo pair), 1 data channel. 1 data channel RS232/RS485
Control: RS485
Indicators: Power, OFDM Lock, FEC Lock, Packet Error, Signal Strength
Modulation Technique: Coded Orthogonal Frequency Division Multiplexing
IF Input Range: 300 to 800 MHz
Input Sensitivity: -95 dB min (RF sensitivity including front end LNB)
-92 dB min (IF input sensitivity into the receiver)
Encryption: Substitution Cipher or AES 256-bit (AES is subject to
export license approval)
Forward Error Correction: Reed Solomon, Viterbi interleaving, outer leaving and convolutional encoding. 1/2 or 1/3 code rates.
Input Voltage Range: 24 - 30 VDC 28 VDC nom
Current Consumption: VLDR-IF-28-XX: 0.8 A nom at 28 VDC
VLDR-IF-HD-28-XX: 1.1 A nom at 28 VDC
Working Temperature Range: -20ºC to +55ºC
Working Humidity Range: Up to 90% relative humidity, non-condensing
Storage Temperature Range: -20ºC to +70ºC
Dimensions: 215 x 228 x 55 mm
Mass: 2.5 kg.