Your comments remind me of how FCC limits began a few decades ago.
As many may recall, in the days before "real" PCs, Playstations and the like,
Coleman and others began marketing ping pong games one could play on
their TV set.
Since TVs had no direct inputs at the time, the small game box fed VHF signals
to the TV antenna inputs, which were demodulated within the TV. The user was
directed to remove the TV antenna leads to do this.
However, it was not uncommon for a consumer to leave both the antenna and
game leads attached to the TV. When the game was tured on and played,
faint images of ping pong balls and paddles were transmitted via the outside
antenna to neighbors' TV sets, prompting compliants.
Due to this and related phenomena the FCC created EMI limits for digitally
clocked systems employing a 10kHz clock or higher. You know the rest of the
story. Oddly, our many electrical appliances not involving digital controls are
not regulated, and create most of the EMI in a typical household.
George
-------------------------------------------
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/
To cancel your subscription, send mail to:
majord...@ieee.org
with the single line:
unsubscribe emc-pstc
For help, send mail to the list administrators:
Ron Pickard: emc-p...@hypercom.com
Dave Heald: davehe...@mediaone.net
For policy questions, send mail to:
Richard Nute: ri...@ieee.org
Jim Bacher: j.bac...@ieee.org
All emc-pstc postings are archived and searchable on the web at:
http://ieeepstc.mindcruiser.com/
Click on "browse" and then "emc-pstc mailing list"
