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

[Kenneth G. Gordon]

On 10 Jun 2013 at 21:54, Roy Morgan wrote:

> 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.

Ah, yes. I had forgotten about that. Thank you, Roy.
 
> 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.

I applied, a number of times, pure Acetone via a long "Q" tip, hoping that 
would take off the enamel. I soon saw shiny copper, so it must have done 
something good.

> 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.)

Thanks for that too. I didn't count the wires, but I know there were at least 6. 
It was probably 7. As far as I can tell, I got them all. In any case, the receiver 
now works. Sensitivity is less than 1 microvolt on AM. So, hopefully I didn't 
miss more than one.

I guess I better take notes and keep them in a notebook from now on.

Ken W7EKB