Hello Chris,

>> I was wondering if the #3 material which is rated for use 
>>from 0.05 to  0.5 MHz, and has several times the permeability would be a 
>>better
>> choice for more power through it? 

>Yes that sounds like a good concept.

Look what the mini ring core calculator is showing (see attachment) and draw 
your conclusions.
The calculations are completely based on amidon data.
I've chosen 600V RMS ,that's the voltage drop across L2 at the 2kW level.
For #3 I had to resort to T200 size because 225 is not available for this 
material.

73
Clemens
DL4RAJ 

 

>-----Original Message-----
>From: [email protected] 
>[mailto:[email protected]] On Behalf Of DK7FC
>Sent: Thursday, May 25, 2017 2:09 PM
>To: [email protected]
>Subject: Re: LF: Iron dust toroids and heating
>
>Hi Chris,
>
>Am 25.05.2017 12:40, schrieb Chris Wilson:
>> I was wondering if the #3 material which is rated for use 
>from 0.05 to
>> 0.5 MHz, and has several times the permeability would be a better
>> choice for more power through it? It probably gives a higher Q with
>> fewer turns, allowing the use of larger wire without having
>> overlapping layers in the winding?
>>    
>
>Yes that sounds like a good concept.
>
>It is interesting to follow your plans. Actuelly i would like 
>to try to 
>build a  2.5 kW or larger PA as well, just for interest of course. I 
>would of course use it together with a dummy load only, 
>because you must 
>not radiate more than 1 W here in DL, and i am a conformist and under 
>the spell of authorities (german: autoritätshörig) :-)
>It would be interesting to deal with the problems that would 
>appear with 
>such PAs. For say 3 kW and the comfortable situation to have a 
>suitable 
>60 V power supply, i would simply build a current mode class D 
>PA, hard 
>keyed with an IXDD614CI and 2x 4x IRFP260N FETs. For the LPF i 
>would use 
>the T225A-2 together with RF litz wire, maybe 250x0.1mm, available at 
>https://www.spulen.com/hf-litze-250-x-0-1-mm-100-g-spule.html and 
>WIMA-FKP-1 capacitors, the 2 kV version...
>
>Good luck and fun with your projects.
>
>73, Stefan
>
>
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T200-3.png
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T225-2.png
Description: PNG image