Rover

Digital COFDM video link

Navtech has recently launched its latest digital microwave link for wireless video transmission.

‘Rover’ uses COFDM (Coded Orthogonal Frequency Division Multiplexing) to give users a very robust link that is virtually immune to the effects of multi-path signal propagation. The diversity receiver simultaneously combines two antenna inputs to further enhance the system’s performance in demanding environments.

Navtech’s aim has been to bring the benefits of COFDM digital link technology to a wider market that until recently has relied on traditional analogue FM technology. Rover offers digital robustness and link performance at analogue prices.

The system has been designed to fulfil the needs of operators wishing to transmit video in applications such as surveillance and film video assist. Minimisation of size, weight and power consumption was a priority in the design.

Rover is offered in two versions. The standard system uses 8MHz channels with JPEG-2000 video compression. For users requiring even narrower channels, a 2MHz system is also available with MPEG4 compression.

Product Description:

The Rover system provides an exceptionally stable wireless video transmission platform in high multi-path environments. Using the latest COFDM modulation techniques and diversity reception principles, Rover delivers high quality, low latency video images in conditions where traditional analogue FM methods fail. Low bandwidth ensures spectral efficiency, greatly increasing receiver sensitivity compared with conventional analogue techniques.

Rover is suitable for a wide range of applications in both the security and video assist fields. It can be used in body worn, mobile and temporary fixed installations. Its low current consumption allows for efficient battery operation.

Various power outputs and frequencies are available catering for longer transmission ranges. A rotary switch allows simple selection of up to sixteen settings, these being any combination of frequency and COFDM parameters. LED indicators and a signal level meter provide the user with a clear view of DC power and receiver tuning lock status.

Technical Details:

Transmitter:
Standard output :	100mW ( 1W optional )
Power :	12 VDC via Lemo or Fischer
Current :	100mW = 500mA (1W =1.3A )
RF o/p :	SMA
Dimensions :	140 mm x 66mm x 38 mm ( 100mW )
Weight :	0.45 kg
Video input :	Composite via BNC
Audio input:	2 channels ( line level ) – H264 / MPEG4 only
Receiver:
RF Inputs:	Dual Diversity MRC RF via N-types
O/P :	Composite Video via BNC
Power :	12V DC via Lemo or Fischer
Current :	600mA @ 12 VDC
Dimensions :	250 mm x 90 mm x 60 mm
Weight :	1.6 kg
Frequencies:
L Band	1.15 - 1.4 GHz 100mW / 1W
S Band	2.28 - 2.585 GHz 100mW / 1W
C Band	5.725 - 5.850 GHz 100mW
Bandwidth / Compression / Modulation
Compression scheme options :	JPEG2000, H264, MPEG-4
Channel bandwidth options :	8MHz, 4MHz, 2MHz, 1MHz
Modulation schemes :	QPSK, 16-QAM