[ARC5] 70+ year old errors found and corrected.

[Roy Morgan]

On Jun 10, 2013, at 8:44 PM, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote: 
> 
> Have any of you 70+ year old folks ever attempted to 1) clean the enamel off of 6 pieces of 
> #60 Litz wire, and then 2) solder them in place with shaky hands? Well, I managed…finally. 

A trick I have heard of working is this:

Put an *uncoated* aspirin tablet under the end of the litz wire and apply solder and the solder pencil.  The aspirin takes off the enamel and acts as flux.  I suggest a good cleaning with water and/or flux remover or the like when done.

My notes file on Litz wire tells that it is made with strand insulation that melts in a solder pot (or with a pencil applied).  I have not tried that.

Note: in a seven strand litz wire, having one strand open reduces the Q of the coil by a measurable amount. Two open is worse, and three open removes the benefit of the litz wire.  (It may well be that the Radiotron Designers Handbook has the details.)

Roy

Roy Morgan
k1lky at earthlink.net
K1LKY Since 1958 - Keep 'em Glowing!