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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