Re: my KPA1500 and 160M

Posted by David Gilbert-2 on Sep 03, 2020; 4:15am
URL: http://elecraft.85.s1.nabble.com/OT-WWV-Time-Transmissions-tp7664561p7664643.html


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



On 9/2/2020 9:02 PM, Adrian wrote:

>
>
>> Now then, whether you want to acknowledge it or not, a ferrite core
>> IS a lossy dielectric and can get hot when you put a high enough RF
>> voltage across it INDEPENDENT OF THE CURRENT FLOWING THROUGH THE
>> WINDING AROUND THE CORE.  You can find innumerable references to the
>> dielectric losses of ferrite materials if you just bother to do some
>> internet searching.  This is NOT an insulation breakdown issue ...
>> not at all.
>>
> A dielectric is defined as an insulator . A ferrite core is not a
> dielectric (insulator),  This is the false fact in your theory.
>
> *Dielectric heating*, also known as*electronic heating*,*radio
> frequency heating*, and*high-frequency heating*, is the process in
> which aradio frequency
> <https://en.wikipedia.org/wiki/Radio_frequency>(RF) alternating
> electric field, orradio wave
> <https://en.wikipedia.org/wiki/Radio_wave>ormicrowave
> <https://en.wikipedia.org/wiki/Microwave>electromagnetic radiation
> <https://en.wikipedia.org/wiki/Electromagnetic_radiation>heats
> adielectric <https://en.wikipedia.org/wiki/Dielectric>material.
>
> It is the dielectric material being heated via molecular rotation.
>
>
> A ferrite core although not a good conductor also is not a dielectric,
> and no mention of dielectric loss is attributed to its heating losses ;
>
>
> https://elnamagnetics.com/wp-content/uploads/library/TSC-Ferrite-International/Predicting_Temperature_Rise_of_Ferrite_Cored_Transformers.pdf 
>
>
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