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
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