ARLA/CLUSTER: The Wireless Bridge

[João Costa > CT1FBF]

The Wireless Bridge

Wireless links are often used to bridge two halves of a computer network
together in situations where physical cables cannot be used.

Over the last weekend, members of *North Humber Raynet* and *Yorkshire 4x4
Response* have taken this idea one stage further, and have succeeded in
joining together the two ends of one of the world’s longest suspension
bridges in aid of their local charity the Dove House Hospice.

However, upon our arrival at the Humber Bridge, it quickly became apparent
that the plans of placing the control station on the bridge itself clearly
wasn’t going to happen due to the Engineering works underway to replace the
original 1980’s toll booths. Following a quick rethink, the control station
was hastily set up on Hessle Foreshore on the North bank, with the network
looking across the 2,220 metres of murky brown water to the checkpoint at
Barton Upon Humber on the South bank – this network worked surprisingly
well with a 20dB signal to noise ratio, and with the sponsored walk taking
place at midnight, the path wasn’t going to be interrupted by passing ships!

An extra bonus of control being moved was that the 3G wireless router used
at control was visible from the checkpoint operating 30m above on the
roadway! Not only did we succeed in passing the checkpoint data over our
network, we also managed to use APRS for the first time to track the
progress of the back marker as he made his way around the 8 mile course
following our ladies with their glow bands, “onesies� and fluffy pyjamas!

*Andy G0VRM*
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