Photos: Crave pays the BBC's R&D department a visit

The Kingswood team use this van to test the viability of the signal being broadcast at certain times from Guildford. They can switch the transmitter on via a phone link, so it isn't broadcasting all the time -- which means it would be tricky for you to tune into it, even if you had the right equipment.

In this demo, the signal only had to travel a few metres, but for the actual tests in Guildford, this van will travel all over the surrounding area looking for the signal and logging the results in a database.

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