[RFI] Is a Micrometals T44-52 a useful Ham toroid?

kd4e kd4e at verizon.net
Sat Jul 7 19:21:10 EDT 2007

Great info, thanks!


> Technical information can be found at 
> <http://www.micrometals.com/materials_index.html>. In general, #52 is a 
> "power conversion" material: mu = 75, but poor Q at RF. The low 
> permeability allows it to handle considerable DC current without 
> saturating. That makes it useful for differential-mode power line filters 
> and the like. Mix #52 is often used for output filters of switch-mode power 
> supplies.
> However, like all iron powder cores #52 won't perform as well as ferrite 
> for common-mode suppression because it has much lower permeability. It 
> won't easily replace beads and snap-on cores when you need to suppress 
> common-mode currents, because it takes many turns to equal the impedance of 
> one turn in a ferrite core.
> The low Q of #52 mix makes it undesirable for transmitter output filters, 
> tuned circuits, and other applications where RF loss would be a problem. 
> For high Q circuits, choose a low-loss mix that's made for RF (such as #2, 
> #6, or #17).
> I hope this helps!
> 73
> --Tim (KR0U)


Thanks! & 73, doc, KD4E
Personal: http://bibleseven.com/kd4e.html

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