Bruce, I can't answer your wind turbine noise question on TB but while
we are on the subject and a bit off topic....in the 70's a 250KW wind
turbine with metal blades was installed on the island of Culebra midway
between Puerto Rico and St. Thomas. As the blades were rotating they
would shock modulate the TV signal reception of WAPA-TV and WKAQ on
channels 2 and 4 causing what appeared to be hum bars rolling across
the screen. I ironically on a calm day the interference would
disappear. It was also determined that aircraft radar from the naval
station Roosevelt Roads using the El Yunque Mtn installation and USN
installation on Crown Mountain in St. often complained of refracted
blips caused by the leading edge of the blades...at least that is what I
was told by hams that worked their. I think today and for that reason
non metallic blades made from composite resins are required for the
larger systems.
Herb Schoenbohm, KV4FZ
On 2/11/2014 4:58 PM, Bruce wrote:
Getting noise from my NW direction. Does not seem to be local. Started
wondering what, at distance, could be causing it. At times it seems to have a
rhythm like a motor.
There are a lot of power generating wind mills showing up. Checking through
Google, they generate DC and convert to 3 phase AC it with an inverter. The
frequency and phase of the inverter is controlled with a sample from the power
grid.
Could their inverters have enough sine wave distortion to have harmonic energy?
So my question is: Does anyone have first hand knowledge of interference on the
low bands from power generator wind mills?
Bruce-K1FZ
www.qsl.net/k1fz/beveragenotes.html
www.qsl.net/k1fz/pennantnotes.html
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