Hi, >Ed Price said: "I have heard of active cancellation equipment which can generate a phase shifted image of the offending signal and locally radiate this signal so as to create a limited "null" zone. How big of a null zone, the uniformity of cancellation, the stability and agility of the cancellation and the cost/complexity of the equipment are all unknown to me.
>I wonder if any in our group has every tried active cancellation?" A friend of mine told me a few years ago that the active cancellation technology was successfully applied in Acoustics. IF it is true, I guess the difficulty to transplant it to Electromagnetic is that Acoustic field is scalar, whereas EM fields are vectors. Best Regards, Barry Ma ------------- Original Text From: "Muriel Bittencourt de Liz" <mur...@inep.ufsc.br>, on 9/22/98 1:35 PM: Hello all, I'm doing my measurements of conducted emissions using a Spectrum Analyser, but my site isn't shielded, i.e. some interferences ( radio stations ) appear at the screen of the SA. So, i'm doing this: i record the signal with the product tested at "off" and when i turn the product "on", i subtract the signal of "on" minus the signal of "off". this means that i subtract the "ambient noise" from the noise being generated by the product itself. What i really want to know is: is this procedure correct? am i doing a nonsense thing? Any comments will be welcome. thanks Muriel -- ================================================== Muriel Bittencourt de Liz INEP - Instituto de Eletronica de Potencia Universidade Federal de Santa Catarina Caixa Postal - 5119 88.040-970 - Florianopolis - SC - BRASIL Phone: +55.48.331.9204 - Fax: +55.48.234.5422 e-mail: mur...@inep.ufsc.br Homepage: http://www.inep.ufsc.br ================================================== --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
