[Amps] 160M PI network Toroidal Coil

[Manfred Mornhinweg]

Carl,

> The T-225/225B (there is no T225-2A) size buys you absolutely nothing
> over the 200 size except a few more turns of wire of the same
> diameter.

Wrong. While the inductance per turns of the T-225 and the T-200 is the 
same, the larger core will run at lower flux density when used in the 
same amp, wound for the same inductance. So its volumetric loss will be 
much lower. It has more volume though, so that the total loss decreases 
only somewhat. But it has much more dissipation surface, so that it ends 
up being able to handle significantly more power, or run cooler at a 
given power level.

And the 225B size is of course much larger and very different from the 
non-B size.

And at least there _was_ a 225A. It shows up in older catalogs. The 
T-225A-2, as listed in an Amidon catalog from 1995, was very similar to 
the current B size, only that the inner diameter was a little bit smaller.

Manfred







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