RF interference from wind turbine??

SpecialistEnergy · Aug 21, 2017

Hello all,

I have a customer who wants to install an internet bridge. The equipment is quite cheap if you use the 5Ghz frequency, but to save costs I would like to put the receiver on an existing wind turbine mast, which has a 2.5kW turbine on it.

My question is, would the turbine motor be likely to cause RF interference with the receiver? It would be mounted about 3 mtrs below the motor.

The salesperson for the receiver says no, I'm interested in other opinions.

Thanks for any help...

Ben

SpecialistEnergy · Aug 22, 2017

UNG said:
I'm assuming you are using directional antennas to facilitate this link

well I'm using kit that has been designed for the job - Ubiquiti Loco M5 from memory

SpecialistEnergy · Aug 22, 2017

UNG said:
I'm assuming you are using directional antennas to facilitate this link

well I'm using kit that has been designed for the job - Ubiquiti Loco M5 from memory

UNG · Aug 22, 2017

Have you used the Link simulator software to calculate the link performance should give you a good indication of what you can expect from the radio kit

SpecialistEnergy · Aug 22, 2017

UNG said:
Have you used the Link simulator software to calculate the link performance should give you a good indication of what you can expect from the radio kit

No, thats new on me! thanks looks interesting. trees are my biggest concern, do you have much experience with this? There is not much tree cover, but what there is lies about 100mtrs away from the receiver - I imagine the software cannot account for this

UNG · Aug 23, 2017

SpecialistEnergy said:
No, thats new on me! thanks looks interesting. trees are my biggest concern, do you have much experience with this? There is not much tree cover, but what there is lies about 100mtrs away from the receiver - I imagine the software cannot account for this

You need a good point to point line of sight as mentioned earlier fresel incursion which could be trees, buildings, masts / pylons can compromise data throughput as can heavy rain. I have not actually looked at the software I linked to but most software for radio calcs can take account of expected regional rainfall.
When I was involved in installing data radio equipment with frequencies from 2.4 to 60GHz and antenna sizes ranging from 100mm square flat plates to 2.4M diameter dishes in the UK & Europe the company I subbed for had path profiling software that took account of earth curvature, ground profile, woodland and even man made objects it linked to OS maps and was expensive although it was no substitute for the human eyeball and a physical survey the desktop exercise just prevented the traveling to look at jobs that had no chance of working although some customers would pay for 3 or more radio links to get around obstructions to provide 1 data link between sites

UNG · Aug 23, 2017

Do you have any pictures of your proposed link path it might make it easier to offer advice on how things may affect what you are intending to do

SpecialistEnergy · Aug 23, 2017

UNG said:
Do you have any pictures of your proposed link path it might make it easier to offer advice on how things may affect what you are intending to do

attached a pic from the online tool - the only issue is trees 200 mrs away from one of the mast points

[ElectriciansForums.net] RF interference from wind turbine??

UNG · Aug 23, 2017

Can't see much problem with that link and I don't think the trees at 200M will cause you any problems.
The good thing with path profile software is you have RX values to aim for and it validates that you have the antennas correctly aligned when you are setting the link up, even fractions of a degree can make a massive difference for the reliability of a link

SpecialistEnergy · Aug 23, 2017

Thanks @UNG

static zap · Aug 23, 2017

UNG said:
Can't see much problem with that link....

Cheers UNG ...

Unless you live in a valley the RAF , or local light aircraft frequent .
It looks nice .
(was amazed how signals will take the long route across water ,)
( just to suprise you )
If it is a valley is it often mist filled ?

UNG · Aug 24, 2017

static zap said:
Cheers UNG ...

Unless you live in a valley the RAF , or local light aircraft frequent .
It looks nice .
(was amazed how signals will take the long route across water ,)
( just to suprise you )
If it is a valley is it often mist filled ?

That is why the bigger links over water use space diverse antennas. There are many things that affect and attenuate radio waves there is even a difference from day to night. With regard to aircraft they are not normally in the radio path for any significant time although I believe the weapons radar on apache helicopters can affect 5.8GHz radio links
One of the best tales I was told by a radio engineer I worked with was a radio link he installed kept frequently dropping out for months until it stopped working completely he went to investigate and found the line of sight had changed because a new bridge had been built right across the link path

SpecialistEnergy · Aug 24, 2017

Ha - some things you cannot plan for...

RF interference from wind turbine??

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