[AMPS] Shunt regulated high voltage psu

[rich]

>Rich said:
>
>> It is a broadband, ferrite toroidal-core, 
>>transformer that triples the RF driving V for the grid.  Twisting the 
>>bundle of 4 wires prior to winding reportedly improves bandwidth. 
>
>A lot depends on whether you go for a conventional transformer in which energy
>is transferred through the core, or a transmission line transformer where the
>core has a common mode suppression function. Worth getting Sevick's
>'Transmission Line Transformers' book. It used to be published by ARRL, but I
>believe it's now published by someone else. Certainly the techniques in
>transmission line tranformers use twisted wire transmission lines, and they 
are
>capable of very wide bandwidths.
>
//   It's a transmission-line wound on a Mu=40, 61mm ferrite toroid.  
Unlike (lower-Mu) powdered iron, (higher-Mu) ferrite has the tradeoff of 
being subject to saturation above a finite number of Webers/cm^3 and MHz. 
-  The fly in the ointment with Sevick is that he tests his designs with 
low power.  For example, Mu=125 ferrite material has a 10MHz rating, 
however, it works well at 29MHz with low power.  With more power, it 
saturates. 
- This transformer needs to work at >150W.   I am not a QRP-devotee. 

cheers, Peter

-  R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, 
www.vcnet.com/measures.  
end


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