On Sep 3, 7:12*pm, Cecil Moore wrote:
wrote:
Nope. The CM choke works precisely because the common mode currents
are mirror images, 180 degrees out of phase.

You are 100% wrong. From "The IEEE Dictionary":
"common-mode (1)(general) The instantaneous algebraic
average of two signals applied to a balanced circuit,
both signals referred to a common reference."

The "instantaneous algebraic average of two signals"
180 degrees out of phase is ZERO.
--
73, Cecil *http://www.w5dxp.com

You reference line 1 to line 2. You put your RF voltmeter acroos the
two conductors. When doing so you measure two times the voltage that
line 1 or line 2 reads with respect to an imaginary isolated grounbd
at the centertap the line 1 or 2 measures separately with respect to
centertap. OF COURSE the summation of all points on the common
reference is zero at all locations at all times, that is why it is
called an isolated "ground"! That is why I said earlier you could
connect the centertap of the isolated CM side to real ground with no
effect on the circuit in an earlier post.