The link doesn't work for me either. There is a reason the Elecraft manuals clearly show the placement and spacing of turns on the inductors. Unless the text says otherwise (such as optimizing the output filter in the KX1) they should be wound just as shown: spacing and number of turns. But it's not high precision work. If the coils *look* like the pictures with about the right amount of core exposed in the gap, and you have *exactly* the number of turns (counting the number of times the wire passes through the center hole), the coil will work FB.
One mistake many builders make is in thinking the wire must lie tight against the toroid core all the way around in each wrap, or turn. That's not so. A small gap between the wire and core is fine. Indeed, it's preferable to pulling the wire so tightly the enamel gets scrubbed off or the wire breaks! The second mistake is worrying too much about small breaks in the enamel coating. The core is *not* conductive! Bare wire touching it is not a problem. The problem is when two adjacent turns short out, usually where the wire passes through the center hole, because bare copper on adjacent turns touches. Not only can that cause trouble from the start, if it's a poor contact between turns it can cause an intermittent that is very frustrating to locate later. Again, don't be too aggressive about pulling the wire too tight around the cores. Allow a natural, small, gap to form between the wire and the core as you wind with moderate pressure on the wire. Ron AC7AC -----Original Message----- Jack, Sounds interesting but the link in your e-mail (http://g4oep.atspace.com/coil/coil.htm) does not work for me. Tom KG3V _______________________________________________ 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
