/'They determined the noise to be one and the same'. /
This is a HUGE win. Now you have them concentrated on fixing the
offending location, instead of spending their time spinning their
wheels, looking for other causes!
I agree, the idea of 'RF absorbing foam' sounds like snake oil. But if
you got them to put large solid chokes on, then let them go on thinking
the RF foam fixed it...
Also, improving the ground system may not help and may actually hurt,
if they increase the coupling of noise into the ground. It is important
that the ground rails do not provide a 'sneak path' around any ferrites
installed on cables with ground, such as at the connection from the roof
to the home run. Specifically, in figure 3 of my article, you must make
sure that the bare ground conductor passing thru the chokes does not
make accidental contact to the rails before it has exited the last choke
in the string (the left hand one in figure 3).
-Tony, K1KP
On 10/6/2018 4:04 PM, Tom Thompson wrote:
It won't. If you put a transmitter inside a screen room with an
external antenna, it will radiate.
Tom W0IVJ
On 10/6/2018 1:59 PM, Tony wrote:
All:
The RF Engineers from Solar Edger came out to my home this week to
assess the noise emanating from my neighbors solar panel system.
They plugged into my antennas to view the spectral noise on my
receiver which they then compared to the spectral noise that appeared
on their portable setup near the solar panels. They determined the
noise to be one and the same.
The next course of action is to improve the ground system and install
RF absorbing foam to each optimizer. I also convinced them to replace
the snap-on ferrites located at each optimizer, with larger ones so
they can loop several turns of cable around each core.
They originally said they would just go with the RF foam which is
puzzling: I don't understand how encasing a noisy device with this
stuff could suppress RFI when the device is attached to long runs of
cable that act like antennas. Can anyone explain how that would work?
Tony -K2MO
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