On 7/30/2014 8:15 AM, Kenneth G. Gordon wrote:
Might anyone here know whether or not these things have been tested for
RFI output, and what was the result?
Remember that RF is radiated by current flowing on conductors. We call
them antennas. :) To be a good antenna on the HF bands, a conductor must
be fairly long. Most street lights are on metal poles, and the wiring is
inside those poles, so that wiring isn't going to radiate. That leaves
current within the lighting fixture itself, which is probably short, and
current in wiring to the pole, which is often buried. One of the reasons
linear fluorescent fixtures radiate is that the lamp itself is long
enough to radiate, and is not shielded. We also hear noise from
electronic ballasts (switching power supplies) if wiring to them is not
shielded.
All of this is a way of saying that while there COULD be a problem, we
should not assume that there WILL be a problem. From what I understand
of noisy street lighting, it mostly happens when a lamp fails.
73, Jim K9YC
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