On 1/30/2016 12:35 PM, Michael St. Angelo wrote:
FCC compliance does not eliminate all RFI, it sets maximum limits for
various frequency ranges. Even if it compliant it may interfere in some weak
signal conditions.
Even if a device using or generating RF meets Part 15 limits (its
unlawful to sell otherwise) it can still cause harmful interference --
which makes it illegal for us to turn it on/(see § 15.15 General
technical requirements./, below). States that enforce implied warranty
place the burden on sellers; that's why they like to disavow any implied
warranty of suitability. See for example the Michigan law on THAT at
http://legislature.mi.gov/doc.aspx?mcl-440-2316
Note that I am not an attorney and this isn't legal advice.
And here's where we violate FCC rules by turning it on:
/§ 15.15 General technical requirements./
/(a) An intentional or unintentional radiator shall be constructed in
accordance with good engineering design and manufacturing practice.
Emanations from the device shall be suppressed as much as practicable,
but in no case shall the emanations exceed the levels specified in these
rules. /
/(b) An intentional or unintentional radiator must be constructed such
that the adjustments of any control that is readily accessible by or
intended to be accessible to the user will not cause operation of the
device in violation of the regulations. /
/(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 problem
(for example, see § 15.105(b))./
emphasis added
Cortland Richmond
ka5s
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