Manu Abraham wrote: >> coiling doesn't affect the actual signal at all. Only common mode. > > It sure does. http://www.ham-radio.com/k6sti/balun.htm That's a balun, otherwise known as common mode choke. The are explicitly exploiting the fact that coiling adds inductance to the common mode path bu= t not to the differential path. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .