RE: [TCML] Stranded/silver plated wire (was Scientific Method)

["Lau, Gary" <Gary.Lau@xxxxxx>]

In a previous message, I said that I no longer have access to the instrument with which I made the AC resistance vs. frequency measurements.  I miss-spoke; it's still here, though it may take some doing to relearn how to use it.

Point is, it's available if you feel a comparison of your silver-plated stranded wire vs. solid magnet wire of the same gauge is useful.  I do.  I'll construct and test two small, identical secondaries (4"x6-12"?) if you supply the wire.

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of DC Cox
> Sent: Wednesday, July 29, 2009 9:34 AM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Stranded/silver plated wire (was Scientific Method)
> 
> I use the 19 strand silver tinned type wire usually in 14 to 18 AWG on many
> of my high power coils.  The 7 strand is not adequate.
> 
> Dr. Resonance
> 
> 
> 
> 
> On Tue, Jul 28, 2009 at 8:44 PM, jimlux <jimlux@xxxxxxxxxxxxx> wrote:
> 
> > Lau, Gary wrote:
> >
> >> Are you saying that you use silver-plated STRANDED wire for
> >> secondaries?  Granted, AC resistance and Q are far less important on
> >> the secondary side, but the notion of this wire being superior to
> >> common magnet wire is incorrect.  Stranded wire is inherently more
> >> lossy at RF frequencies.  This is because the skin effect causes
> >> current to travel on the outer surface of the bundle.  If a strand on
> >> the outside of the bundle weaves to the interior of the bundle, the
> >> current in that strand will try to find its way back to the surface,
> >> and this means traveling to adjacent conductors, through any
> >> resistive oxide layers between them.  This strand-hopping results in
> >> a much higher AC resistance than if a single conductor were used.
> >> This is the reason that Litz wire insulates the strands from one
> >> another.

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