Re: Compressing or expanding turns on a toroid.
The late W4ZCB described a simple L & C oscillator to which
you added the un-known component and then measure the frequency
and by using a simple bit of maths or a spreadsheet calculate the
un-known parameter. You needed a good reference capacitor to do
the initial calibration, I was lucky to be able to borrow a 0.1%
tolerance to make my own standard. Not perhaps as good as a lab
standard but I am aware of the limitations.
On 12/09/2020 23:53, wb8yyy via groups.io wrote:
Yes nice explanation that physical arrangement of the coil adjusts inductance.