Sounds similar to an electronic watch (not a smart watch), which is
considered EMC-benign in Europe.
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2018-10-19 23:22, MIKE SHERMAN wrote:
Esteemed fellow listers --
I'm looking at a very low power, intermittent NFC card reader/writer.
Alkaline battery operated device. NFC is only energized for 10 seconds
at a time on demand, and range to read/write is less than 1 cm from
the surface of the device.
I'm not an EE, but my simplified thought process is: "I can barely get
this to couple magnetically with a card sitting on its surface. How
could I possibly interfere with broadcast services or other equipment?"
So, oh wise ones, from your experience what actions with respect to
FCC are reasonable to do? For example, radiated emissions testing
seems to me like a total waste of time and money.
More technical details: maximum input power to the NFC chip is 17 mW.
Chip is coupled to a flat 30mm x 40mm "NFC Ferrite Antenna (13.56
MHz)" that my EE describes as "zero gain." We're rating RF output as 0
mW (i.e., rounding off, it's a lot closer to 0 mW than to 1 mW).
Looking forward once again to interesting wisdom from this group.
Mike Sherman
Graco Inc.
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