Richard Clark wrote:
On Mon, 10 Dec 2007 21:04:06 GMT, Owen Duffy wrote:


I can't quickly think of a sampling technique that truly takes a
point sample.


Slotted line.

Doesn't take current sample

Probe is of finite size (albeit small fraction of lambda in most cases)

The difficulty of making accurate RF current measurements at a point is
why things like slotted lines were invented. You can measure voltage at
a series of points and calculate what the current *must* be.