[Elecraft] my KPA1500 and 160M

[Vic Rosenthal]

Ferrite is a bunch of tiny ferrous particles glued together by a nonconducting substance. It has magnetic properties but currents can’t flow in it (at least not very far). I haven’t tried, but I bet an ohmmeter would say it’s an insulator.

Victor 4X6GP 

> On 3 Sep 2020, at 7:48, Adrian <vk4tux at gmail.com> wrote:
> 
> Please quote your online reference please regarding ferrite cores being a dielectric
> 
> If so then my not just use un-enammeled wire on a course wound core ? A dielectric is an insulator ;
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> Dielectric
> 
> From Wikipedia, the free encyclopedia
> Jump to navigation <https://en.wikipedia.org/wiki/Dielectric#mw-head>Jump to search <https://en.wikipedia.org/wiki/Dielectric#searchInput>
> Not to be confused withDielectric constant <https://en.wikipedia.org/wiki/Dielectric_constant>orDialectic <https://en.wikipedia.org/wiki/Dialectic>.
> 
> 
> A*dielectric*(or*dielectric material*) is anelectrical insulator <https://en.wikipedia.org/wiki/Insulator_(electricity)>
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> I don't see any reference to ferrite cores being a dielectric online.
> 
> The molecular alignment heating method regarding dielectric loss, is not mentioned on any ferrite core RF heating science, that I can find.
> 
> Please read ;
> 
> Predicting Temperature Rise of Ferrite Cored Transformers George Orenchak TSC Ferrite International 39105 North Magnetics Boulevard Wadsworth, IL 60083
> 
> 
> "Core Losses Core losses are a significant contributor to the temperature rise of a transformer. Hysteresis loss, eddy *current* loss and residual loss all contribute to the total core loss. At high flux densities and relatively low frequencies, hysteresis losses are usually dominant. Hysteresis loss is the amount the magnetization of the ferrite material lags the magnetizing force because of molecular friction. The loss of energy due to hysteresis loss is proportional to the area of the static or low frequency B-H loop. At high frequencies, eddy current losses usually dominate. Eddy *current* loss is from a varying induction that produces electromotive forces, which cause a current to circulate within a magnetic material. These eddy *currents* result in energy loss. Understanding the behaviour of the combined total core loss as functions of flux density and of frequency is most important. "
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> Dielectric is not mentioned.
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>> On 3/9/20 2:15 pm, David Gilbert wrote:
>> 
>> If you weren't too stubborn you could find many, many online references to the dielectric characteristics of ferrites.  A ferite core absolutely IS a dielectric.  There is nothing false about what I've been telling you.
>> 
>> Dave  AB7E
>> 
>> 
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