RF interference from wind turbine??

[SpecialistEnergy]

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

 

[Pete999]

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

Can't help I'm afraid

 

[Leesparkykent]

I've deleted your other duplicate thread...please stick to one as can get confusing. Cheers Lee

 

[Pete999]

I've deleted your other duplicate thread...please stick to one as can get confusing. Cheers Lee

OK couldn't remember posting something similar, sorry Lee.

 

[RWJ]

You need someone with a spectrum analyser.
I was going to suggest a chepo TV dongle SDR but they only go to about 1.5 / 2 ghz

 

[static zap]

Other thought , do they cope with a bit of microphony .
Rubber mount ?
( Mechanical vibration .. not tried beating one with a rubber stick !)
Remember some transmited mechanical noise on a local towerblock .(may have just been reflected sound,from blades - poor windows )

( Moving blades getting in reflected signal paths may get interesting )

 

[SpecialistEnergy]

( Moving blades getting in reflected signal paths may get interesting )

I will mount the receiver below the blade tips, and its in a very rural area so little to interfere with it...

 

[dmxtothemax]

why don't you try it and see ?

 

[SpecialistEnergy]

why don't you try it and see ?

I think I'm getting to the point where I'll have to - but it will cost my client about £750 so it would be nice to have some confidence it will work without telling him there may be another couple of hundred on top for another pole to be put up

 

[seltechpc]

A cheap and cheerful method is to use a broad bandwidth radio and spin the dial and listen for any change in the received signal with the genny running and stopped.

 

[UNG]

A lot will depend on the radio propagation of the antenna you intend to use as to how far below the blade tips you will need to be to avoid fresel zone incursion of the radio path.

 

[SpecialistEnergy]

A lot will depend on the radio propagation of the antenna you intend to use as to how far below the blade tips you will need to be to avoid fresel zone incursion of the radio path.

Could you explain more? And offer any advice on how much lower?

 

[Strima]

We had an intermittent fault on a wind farm microwave link. Every so often there would be a very short but repetitive transmission break that was messing with the backhaul.

When the wind changed direction the head would rotate and the blades were blocking the link as they spun, the link installer got some grief for that one...

 

[SpecialistEnergy]

Luckily the prevailing wind will put the blades on the other side of the mast to the receiver for the vast majority of the time, but I want to avoid the problem entirely because the link will be for general internet use not simply data logging info. I am making a bridge from someone with a Fibre connection to someone else on a very poor broadband connection miles from the exchange.

 

[UNG]

Could you explain more? And offer any advice on how much lower?

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

Have a look at this
Google Image Result for https://upload.wikimedia.org/wikipedia/commons/thumb/7/74/Sidelobes_en.svg/220px-Sidelobes_en.svg.png - https://www.google.co.uk/imgres?imgurl=https://upload.wikimedia.org/wikipedia/commons/thumb/7/74/Sidelobes_en.svg/220px-Sidelobes_en.svg.png&imgrefurl=https://en.wikipedia.org/wiki/Antenna_(radio)&h=220&w=220&tbnid=mgCalFGWAlhSWM:&tbnh=160&tbnw=160&usg=__d-WST1OU6u8EBTAagtDiW1ZK-uc=&vet=10ahUKEwiMgqnd9-rVAhWCZVAKHb6xB4IQ9QEILDAA..i&docid=iTS-STuTTmBDjM&client=firefox-b&sa=X&ved=0ahUKEwiMgqnd9-rVAhWCZVAKHb6xB4IQ9QEILDAA#h=220&imgdii=mgCalFGWAlhSWM:&tbnh=160&tbnw=160&vet=10ahUKEwiMgqnd9-rVAhWCZVAKHb6xB4IQ9QEILDAA..i&w=220

As shown in the pictures the main lobe of the radio wave generally looks like a rugby ball and is surrounded by side lobes ideally for a good radio path you would want to avoid any incursion into the first side lobes