Following the thread on this discussion reminds me of a problem that I had when I first graduated.
I worked in a TV studio equipment R&D lab where dc power was wired around the building. At one point I experienced considerable noise problems at the output of a video amplifier function that I was designing. Trying to locate where this occurred, I thought that the noise looked more like an audio signal than random noise. An ear-phone soon proved this to be the case. After a little investigation I found that the long dc cables were acting as an aerial picking up an AM radio station. This was then being demodulated in my circuit with the resultant noise. Needless to say, the distributed dc line didn't last much longer. Regards, Neil Helsby ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** ------------------------------------------- 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: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] 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"
