Topband: Low band noise

[Brian Miller]

Hi Bruce

Very happy to answer questions that top band DXers may have about our 
experience at ZL6QH.

Please note that not all wind farm installations are noisy - it depends on 
the type of turbine technology that is deployed.

73, Brian VK3MI ZL1AZE

-----Original Message----- 
From: Bruce
Sent: Saturday, February 22, 2014 12:45 PM
To: Brian Miller ; topband at contesting.com
Subject: Re: Topband: Low band noise


Hi Brian,

Thank you for your input and sorry to find that the windmill farm noise
caused ZL6QH to close down.

It will become evident that each country will need enforce RF noise limits
on windmills, or start  rule making if none exist.

In the USA complaints to the ARRL should bring guidance in this matter.

Some of the low band reflector DXers may wish to ask questions, if that is
all right with you.

Thanks again,
73
Bruce-K1FZ


----- Original Message ----- 
From: "Brian Miller" <brianmiller at xtra.co.nz>
To: <topband at contesting.com>
Sent: Friday, February 21, 2014 5:46 PM
Subject: Re: Topband: Low band noise


> Hi Bruce et al
>
> Radiated noise from a new wind farm eventually forced us to close down and 
> exit the ZL6QH contest station. A detailed report on the noise levels is 
> available at 
> http://www.zl6qh.com/rf-noise-measurements-quartz-hill-2009-v3.pdf .
>
> The ZL6QH wind farm used Siemens 2.3 MW variable speed turbines. We 
> believe the noise was generated by the water cooled electronic power 
> converter technology that was used to convert the variable output of each 
> turbine to the fixed voltage and frequency of the national grid.
>
> Our observations suggested that an HF contest station would have be 
> located at least several km from the wind farm to reduce the interference 
> to an acceptable level on the low frequency bands.
>
> 73
>
> Brian VK3MI ZL1AZE
> ----------------------------------------------------------------------