From Part 15:
Section 15.103 Exempted devices.
The following devices are subject only to the general conditions of
operation in Sections 15.5 and 15.29 and are exempt from the specific
technical standards and other requirements contained in this Part. The
operator of the exempted device shall be required to stop operating the
device upon a finding by the Commission or its representative that the
device is causing harmful interference. Operation shall not resume
until the condition causing the harmful interference has been
corrected. Although not mandatory, it is strongly recommended that the
manufacturer of an exempted device endeavor to have the device meet the
specific technical standards in this Part.
[SNIPPED]
*(f) Digital devices that have a power consumption not exceeding 6 nW. *
Cortland Richmond
On 1/25/2012 1842, Michael Heckrotte wrote:
Years ago I recall discussions about electronic wristwatches and FCC
compliance; the power drawn from the watch battery was less than the
output power of an emission that would just pass the Class B limit
therefore compliance was inherent and no EMC testing was required. I
don't know if this was ever codified.
Extending this concept to a radio would give new meaning to a
flea-powered transmitter.
Best Regards,
Mike
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