[time-nuts] Frequency of LC Tank.

Didier Juges shalimr9 at gmail.com
Sat Apr 12 13:12:28 UTC 2014

Keep in mind that anything you connect across your tank circuit will affect its resonant frequency and Q (signal source and measuring device). You need to make sure your equipment is very loosely coupled to the UUT through small value capacitors for instance.

 Didier KO4BB

On April 11, 2014 3:15:37 PM CDT, Dan Kemppainen <dan at irtelemetrics.com> wrote:
>Hi all,
>I'm thinking about an upcoming project, if this is off topic please
>disregard or contact me off list. :)
>I have a large LC tank, with a very lossy inductor. Being driven by a
>pulse width push pull driver, that is digitally controlled. The driver
>circuit will couple through a N:1 transformer. I need to be able to
>adjust the push/pull driver frequency to match the frequency of the
>circuit. (See frequency/time is involved :) ) The tank components can
>vary and are not adjustable, so the drive frequency needs to vary.
>I'm thinking some sort of a phase detector may be the way to go. I'm
>just not sure were to sample the V and I signals to look for phase
>differences, or where to get a good clean reference from.
>So the question is, when actively driving a tank circuit, how do you
>know you are driving it with the same frequency ad the same phase it
>naturally oscillates at.
>Any thoughts, suggestions, or readily available papers you guy could
>point me to?
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