COFDM Ship to Shore Video Link System

Navtech’s digital COFDM link system is composed of several core components, specifically designed for demanding marine applications. All equipment is proven and meets accepted specifications for marine use. The system provides the latest available technology for robust and secure digital transmission of full resolution, full frame rate video pictures from sea borne platforms. The system is in use by both security and broadcast operators. A wide range of compatible shore-side receiver systems are available to meet any operational requirements for short, medium or long range reception.

Integrated Antenna and PA Module for low-loss Mast Head mounting	COFDM Transmitter

A 19” rack panel mounted transmitter with integrated power conditioning and control panel for setting the transmitter parameters. The transmitter integrates video interfaces, M-PEG encoding, COFDM modulation and linear power amplification. The unit meets RTCA/DO160 standards for EMC and mechanical robustness

Inputs:
Analogue video ( PAL / NTSC ) - option for 2 inputs
Digital video (ASI or SDI) – optional
Audio
GPS Data

Outputs:
RF: up to 200mW output - Optional selectable Hi / Lo power
2.0 – 2.5 GHz or 3.3 – 3.6 GHz (other frequencies as required)
Video monitor (analogue composite)

Encoding:
M-PEG-2 4:2:0 MP@ML 1.5 to 15 Mbit/s
Optional MPEG-2 4:2:2 P@ML 1.5 to 20 Mbit/

Modulation:
Coded Orthogonal Frequency Division Multiplexing ( COFDM )
6, 7 or 8 MHz bandwidth, QPSK or 16QAM modulation
Selectable Guard Interval and FEC
Fully DVB-T compliant
Secure, user-selectable AES 128 bit digital encryption

Power:
Voltage requirement : 18 – 30 V DC ( 28V typical) or

Control panel features
Channel selection
Power on / off
Selectable Encryption

Available Options
Selectable video source
Selectable transmit mounted

Physical
Dimensions 2U 19” rack mounted panel case
Weight 1kg

Environmental
Operating temperature: -20 to +50 deg C

Transmit Antenna and integrated PA
A variety of Omni directional antennas are available to suit different installation and performance requirements. Mounting is directly to the ships mast head antenna bridge or other suitable location. The integrated PA ensures that the transmit power is delivered to the antenna without loss in the feeder cable.
Low power RF is fed directly from the transmitter located below decks and amplified for transmission by the mast head PA.

A typical specification for use on ship borne applications (as shown in photograph) is:

• Gain: 6 to 8dBi
• Polarisation: Linear or circular
• Weight : Typical 1.2Kg
• Size: 220 x 100 x 125 mm
• Connector : RF (N-type) & power
• Power : 8W nominal RF
• Temperature : -20 to +50 deg ºC

NOTE: Navtech Systems Limited has a policy of continuous product development. The data provided above should therefore be used for guidance purposes only.