Hi; See the article below. Roy does some testing with various materials.
I don't seal anything unless it's going to be exposed to the weather. Pete kn6bi "Toroidal Inductor Measurements" by Roy Lewallen, W7EL December, 1998 http://www.qrp.pops.net/w7el.htm -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of John, KI6WX Sent: Friday, May 18, 2007 2:34 PM To: J F; [EMAIL PROTECTED]; Elecraft Discussion List Subject: Re: [Elecraft] Has anyone epoxied their toroids after they werewound? Applying any material (Q-dope, epoxy, hot glue) to the wound toroid is not a good idea. It increases the interwinding capacitance and can effect the performance of the various toroidal transformers. This is especially true in the transmitter section where the toroids are tuned with a fixed capacitor to increase the power transfer. The value of these capacitors was determined without any coating material on the toroid, and changing the dielectric around the toroid windings may require a change in the capacitor's value. -John KI6WX > Never have epoxied toroids, I can see one major > disadvantage using this method... You'd never be able > to rewind the same core. Epoxy is a real bear to > remove. > > I've used hot glue to keep toroids in place, a little > easier to remove if needed. > > Think you're better off with nail polish or acrylic.. > _______________________________________________ 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 __________ NOD32 2277 (20070518) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com _______________________________________________ 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
