Of interest, so I forward this to the group:
- Robert -
Robert A. Macy, PE m...@california.com
408 286 3985 fx 408 297 9121
AJM International Electronics Consultants
619 North First St, San Jose, CA 95112
-----Original Message-----
From: John Woodgate <j...@jmwa.demon.co.uk>
Newsgroups: sci.engr.electrical.compliance,sci.electronics.design
List-Post: emc-pstc@listserv.ieee.org
Date: Tuesday, March 14, 2000 11:55 PM
Subject: Dithered clocks and EMC - BEWARE
>About a year ago we had a thread on this subject, concluding that some
>research was needed to see whether dithered clocks were better or worse
>in terms of conforming to EMC requirements.
>
>I learned very recently that some reliable but as-yet unpublished
>research has found that digital TV receivers are some 40 dB (!!) more
>sensitive to dithered clock emissions than to unmodulated carriers. This
>is likely to lead to changes in EMC limits within maybe as little as
>three years, since the authorities certainly don't want to be deluged
>with complaints of interference from people who have just opted for
>digital TV.
>
>So, if you are thinking of using a dithered clock, think again!
>--
>Regards, John Woodgate, OOO - Own Opinions Only. Phone +44 (0)1268 747839
>Fax +44 (0)1268 777124. http://www.jmwa.demon.co.uk
>I wanted to make a fully-automated nuclear-powered trawler,
>but it went into spontaneous fishing.
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