Video projects

• Developed video router for an InSb thermal imaging camera.

• Developed a low power scrambled analogue microwave link for covert surveillance

• Microwave repeater for covert video transmission in conjunction with a study detailing propagation, fading and multipath effects on analog and digital microwave links.

• Single antenna, 4 channel microwave transmission system for audio and video

• Study into video scrambling techniques

• UHF manpack ENG system

A synthesised X-band downconvertor for a microwave video receiver.

The microwave circuit was built on 0.4mm FR4 which is possible if there are no tuned components such as filters.

The synthesiser used an Analog Devices PLL IC with a Hittite prescaler and VCO and was programmed

with a FLASH programmable PIC

General view inside the receiver housing

main board removed, showing LNA (Miteq), downconvertor and Ovation digital scrambler unit.

In some transmit applications, the extremely low power consumption of an FM-modulated

DRO is more attractive than a COFDM link, although the digital

transmission gives inherent protection against eavesdroppers.

However, the analog modulated link can be used with an "Ovation" scrambler, which renders the image unreadable and

embeds an audio stream with the scrambled video signal

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Communications projects

Antenna projects

Radar Projects

Modelling and simulation

Digital Television

Renewable Energy

Contact details:

JWD Ltd

Telephone/Fax: +44 (0)1403 261251, Mob: 07973 173808

email:

julian @ jwdltd.demon.co.uk