On 11/12/2017 12:07 PM, Mike Kirkland wrote:
Actually the FCC has proved turning the system off is ineffective at
eliminating the interference and the system must be disassembled.
Interesting -- the question is, HOW and WHAT was turned off? There are
(at least) two components/functions of solar power systems that can
generate RFI. One is charge regulation, which prevents batteries from
being overcharged. Another is power inversion from DC to AC. In both
cases, it is failure to suppress the generation and radiation of RF
components of pulsed currents and rectangular waves. It is quite well
known that excessively fast rise times, poor circuit design, and poor
wiring/installation techniques increase the strength of these components
and cause them to be radiated.
If, for example, inverters were turned off but charge regulators were
still functioning, they could still be generating noise.
Another possibility is that improper bonding by the installation company
might be causing noise present on the mains power system to be radiated.
QST published an interesting piece a few years ago detailing the heroic
efforts required to suppress a really bad system.
73, Jim K9YC
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