[R-390] Soldering Litz wire

[Roy Morgan]

On Apr 6, 2011, at 1:00 AM, bernie nicholson wrote:

> ... after removing the transformers I found that... some of the  
> strands  of litz wire had
> gone open circuit at the terminations -  after running more solder   
> into the
> Terminations  and burning off the enamel A normal bandpass  
> characteristic
> was achieved  ,

I have not tried this but:

I've heard that heating litz wire with the solder iron tip against an  
UNCOATED aspirin tablet will remove the enamel on the strands as slick  
as you please.  (push back or remove the insulation first, perhaps.)   
Cleaning with a bit of baking soda then isopropyl alcohol would seem  
in order, then solder as you like.

Often we find litz wire of 7 strands.  If one strand is open, the  
effectiveness is reduced a bit, if two, it's reduced more, if three,  
it's reduced a LOT.  (I can't find the measured numbers I remember  
seeing.)

Roy




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