On 3/27/2017 4:36 PM, Jim Brown wrote:
On Mon,3/27/2017 2:12 PM, Richard (Rick) Karlquist wrote:
What I meant by lossier is that in a common mode
choke, there would be more heat dissipation loss
with the Laird. I did NOT mean that the series
resistance was higher.
Not necessarily. Remember that power is I squared R, and if R is
sufficiently large, I falls to the point that power is small (because
it's falling twice as fast as R increases). OTOH, that R is undesired
when using the core in a real transformer (that is, the core carries all
of the flux for the differential power). I know you know this, Rick, but
this is for others on the reflector who may not.
73, Jim K9YC
The confusion of the Z = R + jX model as you described is why I
measure ferrites using the Y = G + jB model. Some network analyzers
can display directly in this format. In this case, G describes
the losses in a common mode choke, and 1/G is a figure
of merit. The G value I measured on Fair-Rite #43 was smaller than the
G value on competitors versions. Hope this clears up the
confusion.
73
Rick N6RK
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