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Fixed wireless broadband and wind turbines, good or bad?
Wednesday 28 November 2012 10:02:53 by Andrew Ferguson

A fixed wireless service that provides Internet access for some 500 people in and around Northlew may be at risk from an 80 metre wind turbine.

While from a distance wind turbines can look tall and thin, the pedestal is pretty wide to support the weight, and additionally the blades can create periodic drops in signal level and variable amounts of reflection. Ofcom in 2008 looked more closely into this, and for a single turbine concluded that if the turbine is in the signal path, a 2dB drop in signal level is likely.

This means that if the wireless service in Northlew is a single transmitter with individual antenna at each property, picking a reasonable location should avoid any problems. If subsequent wind turbines are added to create a wind farm, then things become more complex, and the Ofcom testing suggests that farms can create fairly large periodic drops in signal level.

Comments

Posted by asjonesmcguire over 4 years ago
Maybe it's time for operators to consider Mesh networking for this sort of situation then....
Posted by herdwick over 4 years ago
We have no right to a view, so presumably no right to a line-of-sight radio link either.

The RAF have successfully objected to some wind turbines on the basis of aircraft risk or radar obstruction I believe.
Posted by greenglide over 4 years ago
Presumably there is no right to line of sight access if somebody build a house or other structure in between either?
Posted by scootie over 4 years ago
surely the wind farm owners would rather add cost of re transmiting the signal if it does i.terfere with line of sight signal as opposed to the extra red tape planning.

funny tho as a bbc four prog on story of elecy had epi on wireless history an testing restience of i think jermainen a table fan was by l luck in front of light an the effect of light was seen on amp monitor thing. worth a watch
Posted by vfast_tim over 4 years ago
2db isn't that significant of all customers have been installed with reasonable signal margin.
Posted by mhc over 4 years ago

2dB - a rain shower can cause more than that! A customer would need to have several turbines in a straight line between him and the transmitter with all blades in sync for it to cause a problem.

A couple of small repeaters would resolve the issue and cost next to nothing.

Posted by andrew (Favicon staff member) over 4 years ago
@mhc data on a farm of seventeen was creating drops in the 15 to 20dB range

Posted by bigluap over 4 years ago
How about putting the wireless aerials on top of the Wind Turbines, a Win Win situation then?
Posted by bigluap over 4 years ago
or a 18 Db gain yagi can be picked up on eBay from china for about £15 so long as you know where to point it.
Posted by bigluap over 4 years ago
2.4 GHz and about 2 foot long
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