HUH ?? 'snugness of fit' ? as long as it stays in position, i dont think it matters... and the inverse square law goes with radiated signals, in the 'ether', notconducted ones, on cables, which act like transmission lines... dan, w5xz
--- On Sun, 4/18/10, Tim Ellison <telli...@itsco.com> wrote: From: Tim Ellison <telli...@itsco.com> Subject: Re: [Flexradio] Common Mode Chokes - Purchasing Ferrite To: "Steven L Hess" <sh...@bak.rr.com>, "FlexRadio@flex-radio.biz" <FlexRadio@flex-radio.biz> Date: Sunday, April 18, 2010, 8:57 PM It is important. The effectiveness of the impedance provided by the ferrite is determined by how close the material is to the electromagnetic field (the common mode currents) that is magnetizing the ferrite material. I suspect that the inverse square law would be applicable in this case, so twice as far away is 4 times less effective. FlexRadio just received reprint permission for the article by Chuck W1HIS, Common-Mode Chokes and it is available from the Knowledge Center http://kc.flex-radio.com/KnowledgebaseArticle50471.aspx -Tim -----Original Message----- From: flexradio-boun...@flex-radio.biz [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Steven L Hess Sent: Sunday, April 18, 2010 4:03 PM To: flexradio@flex-radio.biz Subject: Re: [Flexradio] Commom Mode Chokes - Purchasing Ferrite How important is snugness of fit when applying beads and toroids to wire and cables for RFI suprerssion and common mode problems? -- Regards de KC6KGE Skype flamebait Monitoring at least one of the following Frequencies if the radio is on and I am not on a net or using the digital modes; 3975, 14.329. I am always listening for fellow Flexers. _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/ _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/ _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/
