Larry Green wrote:

Ferrite Rings
These can come in a range of sizes up to several inches in dia. They can
also be 'salvaged' from the back of old speakers or TV tubes


The ferrite used in permanent magnets has a different composition than
the linear ferrites used in attenuator cores and is already in
saturation. In addition to adding a little inductance, the material in
an attenuator core is "lossy" at RF frequencies, turning the RF energy
into heat.

Kevin Gallimore




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