[RFI] Switching Power Supply test Video

[Cortland Richmond]

Since reception depends on uncontrollable parameters of propagation, 
antenna system and receiver performance, adjacent-channel rejection, 
etc., there are NO quantified definitions of harmful interference -- and 
Part 15 doesn't guarantee there won't BE any harmful interference.

 From Part 15.3:
(m) Harmful interference. Any emission, radiation or induction that 
endangers the functioning of a radio navigation service or of other 
safety services or seriously degrades, obstructs or repeatedly 
interrupts a radiocommunications service operating in accordance with 
this chapter.

And from Part 15.15
(c) Parties responsible for equipment compliance should note that the 
limits specified in this part will not prevent harmful interference 
under all circumstances. Since the operators of part 15 devices are 
required to cease operation should harmful interference occur to 
authorized users of the radio frequency spectrum, the parties 
responsible for equipment compliance are encouraged to employ the 
minimum field strength necessary for communications, to provide greater 
attenuation of unwanted emissions than required by these regulations, 
and to advise the user as to how to resolve harmful interference 
problems (for example, see §15.105(b)).

Check out 
http://www.commlawblog.com/2009/01/articles/broadcast/finding-the-harm-in-harmful-interference/

I've suggested measuring SNR when interference is both present and 
absent, this being the closest we can get to an objective test; the ITU 
has published SNR's requred for grades of service using different modes.

Cortland Richmond
KA5S
EMC since '83.

On 8/7/2016 3:54 PM, Michael Coslo wrote:
> Unfortunately, it is not always possible to get meaningful results with meaningful defined as tightly controlled laboratory conditions. I would love to see the work that has the lab results.  Anyone have the cites or could grant access to their own work in this area? It would be especially helpful to see the tests done on the