I was studying the schematics of tag readers and it struck me odd that there is
no measure whatsoever to reduce harmonic radiation in most of them, in some, one
can see a lame attempt at tuning the coil with a capacitor. These devices will
put upwards of 10 Watts into the 'air' without any bandwidth and harmonic
limiting ?! While I know that the frequencies used are reserved for this use
(and so are their harmonics - excepting 125 kHz which will be all over
everything up to a few MHz at least - not that anyone would notice, due to the
amount of smpsu's using similar frequencies), I do not remember seeing any
waiver on harmonic radiation for these devices ? So what gives ? Is their
harmonic radiation tolerated in the interest of better and more inexpensive Big
Brothering ?

a discussion is welcome, thanks,
Peter P.


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