N4YM asked: 1) Is it ok if a bare portion of the winding touches the toroid? A fellow K2 buildr says ok. And the pix of the KPA 100 show the wire stripped bare right up on the toroid.
2) I am using pliers to tighten things up. This OK? -------------------------- 1) Yes. The toroid cores are good insulators. You only need to be sure you aren't shorting two turns together because the bare wire extends more than one turn onto the coil. Also you need to be careful of bi-filar windings (see below). 2) Just don't get carried away using those pliers. Cores will break and the wire will break where it bends around the core. My copy of the manual does NOT say the wire is pulled "tight", only that when winding with the heavier wire it can be more difficult to handle and that the "...turns should not be loose..." meaning very loose! The wire NEVER lays exactly flat against the cores when wound normally. There's always some small gaps as it wraps around. Be especially careful of the bifilar windings. The enamel can be scraped off of the wire very easily by rubbing them together too hard. That would produce shorts between the turns. If in doubt, check for an open circuit between the windings BEFORE installing them on the PCB (once installed the PCB circuit provides continuity, so you can't check that way once they are soldered in place). Ron AC7AC _______________________________________________ Elecraft mailing list Post to: [email protected] 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
