[RFI] FCC Limits on Harmful Interference: Clarification
Kim Elmore
cw_de_n5op at sbcglobal.net
Sat Dec 28 21:38:16 EST 2019
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 at 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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>
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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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