[RFI] FCC Limits on Harmful Interference: Clarification

[Tony]

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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