Danny Richardson wrote in
:

On Wed, 23 May 2007 22:08:31 GMT, Owen Duffy wrote:


I recently saw an article with the following:

"I would like to express my thanks to xxxxxxxx for continuing the
advancement of the transmission line transformer. We have become
somewhat of co-workers, sharing information back and forth about how
these efficient devices work in the HF, MF, and VHF parts of spectrum.
He has done some recent experiments on new ferrite cores and found
that by reducing the number of turns the actual potential difference
on each turn is greater which increased the core loss. This means that
the losses in these transmission line transformers are voltage
dependant and not flux related."

I am trying to understand how it is that losses are "voltage dependant
and not flux related". Aren't flux and voltage related? Is he trying
to say there are core losses that result from a voltage impressed
across the winding, but the losses are caused mainly by electric field
rather than the magnetic field? My understanding was that whilst there
are dielectric losses in ferrite and iron power materials, the
magnetic losses dominate in most applications.

Is there a sound basis for the quote, or is it advertising bunk?

Owen

Sounds like nonsense to me Owen. The only losses of any importance for
baluns that I am aware of are IR losses and flux loss and sometimes
dielectric losses may be significant.

Danny, K6MHE


Hi Danny,

It doesn't seem to make sense.

I guess I am not encouraged to buy his book to find out more!

Owen