From what I've understood form Ed Hare, "harmful interference" is
defined on a case-bay-case basis. I don't think we want a hard and fast
limit, to be honest. What works in one case may be a disaster in another.
Kim N5OP
On 12/28/2019 7:49 PM, Tony wrote:
All:
I made the mistake of hitting send without editing so I apologize for
my previous post on radiated emission limits. As Ed Hare mentioned
numerous times, there are no FCC limits on radiated emissions below 30
MHz.
What I meant to say was this:
Ed mentioned that the FCC had taken action based on harmful
interference and I assumed it was based solely on the definition of
interference and not how it was generated i.e, radiated or conducted.
Hence, I asked how the FCC measures harmful interference.
This seems logical because the term harmful interference would be
meaningless if the FCC only deems it as such if it's conducted and not
radiated -- it's either harmful or it's not.
Or am I missing something?
Tony -K2MO
Actually, the?? FCC really hasn't given up on?? HF.?? What I have said
is that there are no radiated emissions limits for unintentional
emitters below 30 MHz. (There are conducted limits onto the AC
mains.)?? But the FCC has sent out many dozens of?? advisory letters to
operators of various devices on the basis of harmful interference.??
Now, they will set a higher threshold for?? harmful interference than
we like, but the?? can and do take some (limited) action.?? ARRL has
worked hard to keep this alive in the FCC, and?? so far, it has held.
The solar?? panels?? are unique. Their conducted emissions limits apply
ONLY the ac mains, not other wires, so many of these systems that can
and do cause interference do actually meet the laws about radiated
and conducted limits. Solar Edge may be a bit slow, but they?? are
responding and?? ARRL maintains regular contact with them. We have a??
few unresolved cases and we are planning a field trip?? to go take a??
look at?? them in person, hopefully with Solar Edge?? and Telsa also
present.
Ed
, just CONDUCTED emissions, and that is only on the side that attaches
to the power lines.
So say the panels, optimizers etc are radiating like mad, but the
side of the inverter that hooks to the mains is clean. They meet part
15.
Hence the problem
--
73 de KG2V
Charlie
On Dec 28, 2019, at 2:56 PM, Tony <dxdx@optonline.net> wrote:
???On 12/22/2019 6:19 PM, Hare, Ed W1RFI wrote:
the FCC has sent out many dozens of advisory letters to operators
of various devices on the basis of harmful interference.
Does anyone know what the FCC limits are on harmful interference
caused by radiated emissions with regard to HF and the amateur radio
service? Is the noise measured at the receiving station or is it??
measured at some specified distance from the offending device?
It would be interesting to know if the same FCC standards apply to
commercial and aviation services.
Tony -K2MO
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--
Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP
SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)
/"In theory there is no difference between theory and practice. But, in
practice, there is." //??? Attributed to many people; it???s so true that it
doesn???t matter who said it./
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