On Sat, 06 Dec 2003 13:09:02 -0800, Bill Turner
wrote:

On Sat, 06 Dec 2003 18:39:18 +0000, Paul Burridge
wrote:

As you may know, the inductance of a coil is not a fixed value, but
varies dramatically with frequency.

Er, you mean *reactance* of a coil varies dramatically with frequency,
don't you?

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Er, no I don't. They both vary with frequency.

If the inductance did NOT vary with frequency, the X sub L vs F plot
would be linear. In reality, it is anything but linear.

I'm still none the wiser. Unless you're taking into account stray
inductance from the leads, of course. But the *body* of the inductor
by itself must surely be of a fixed inductance. One does not come
across coils rated at "3uH @ 150Mhz.", for example!
Are you talking about the impact of stray L from the lead-lengths?

--

"I expect history will be kind to me, since I intend to write it."
- Winston Churchill