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