I would like some advice on the correct Ferrite beads to use in the P/S line to minimize noise from a switching P/S. Though slightly off topic, with the exception you must get power to the Elecraft rig somehow and quite often it is a switching power supply due to their small size this is going to be used for my K2. I have read many recommendations on their use here but can't find the answers to my questions. I have spent several hours on the internet and the only conclusive information is "Don't get one of those split beads from Radio Shack as they are for frequencies above 30 MHZ." There was discussion on using type "75" or "77" "as this has a higher impedance at lower frequency" but that does not help me.
My question is "What Ferrite Bead, Core, etc.? Can someone give me a part number. How big does it need to be so that 10 amps, 25 amps, etc will not hurt it? How many turns through the core? Should the wire (wires) be bi-filar wound or separated and wound on opposite sides? Thanks, Rich, KE0X _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
