>
>Some ferrite materials are design to change permeability with DC bias,
>sometimes by as much as a factor of ten. I'm not sure if all mixes will do
>this or only those specifically designed to do so.
>
>I've been trying to come up with a useful application of this property for
>Beverage matching, etc., but so far I can't think of how it could be used
>to advantage.
>
>73,
>
>Charles - K5ZK
Charles:
I'm not sure that this has an application for Beverage matching, but
I have made use of the variable permeabilty property in remotely
tuning a loop antenna. This is done by controlling dc in a coil wound
on a ferrite toroid. In case you might find this idea useful, take a
look at my article: "Remote tuning of a low-frequency loop antenna"
in QEX for May/June 2003.
Bob
VE3OSZ
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