[600MRG] RF Current Transformers

[Marshall Cross]

Use mix 31

Sent from my iPhone

> On Apr 5, 2016, at 6:33 PM, Frank Lotito <k3dz at live.com> wrote:
> 
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> I need help on ferreting out the important characteristics of toroid core materials commonly used to construct LF , MF and HF current transformers for use in RF Ammeters.  Hopefully your assistance will help me to properly choose a core material for toroids, E-cores, binocular beads, etc., for ferrite formulations commonly available from domestic sources, such as Amidon and ByteMark.
> ..........................
> There are many-many Internet articles and "applied technology" hand books, e.g. the RSGB's LF and MF Handbook that present RF ammeter projects using ferrite core materials.  Some of these articles present a discussion of how the RF ammeter works using the "ideal transformer" model.  (Definitely an easy to understand explanation.) I have yet to find articles where the authors discuss the most important characteristics of the ferrite formulation, the importance of winding inductance, core losses, core saturation, and the need to electrostatically shield the one-turn primary from from the multi-turn secondary. A common omission of these articles is the authors' choice of ferrite formulation for the example(s) presented.
> ........................
> Thank you in advance for your assistance.
> ....................
> Frank Lotito  K3DZ / WH2XHA
> 
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