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@xtra.co.nz>
To: <topband@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
----------------------------------------------------------------------
Message: 1
Date: Thu, 20 Feb 2014 13:09:51 -0500
From: "Bruce" <k1fz@myfairpoint.net>
To: <topband@contesting.com>
Subject: Topband: Low band noise
Message-ID: <A683AF2F3AEA44CE9BF4F857A9034DDC@k1fzPC>
Content-Type: text/plain; charset="iso-8859-1"
Thank you for those who emailed information. They basically thought the
larger windmill arrays did not generate much noise. One test, checking all
bands, was from a mobile K3 with a 9 foot whip antenna. Unless the whip
was loaded to 1.8 Mhz it may not pick up much noise at one mile. The most
probable windmill installation noise source is the inverter.
Smaller home/farm 1 phase type may give off more wideband noise. Some
are using transformer-less inverters.
Noise is ever increasing in many areas. There is a need to monitor noise
sources, and installing more directive receiving antennas.
http://www.solacity.com/connections.htm
Watch the inverter video for more info. Highly informative.
http://www.power-one.com/renewable-energy/products/solar/string-inverters/aurora-uno-single-phase/pvi-30363842-north-america/series
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