The centre conductor of the coax and the inside surface of the braid
flow currents that are balanced - equal in amplitude but with a phase
difference of 180 degrees; they wouldn't produce any net flux in a
ferrite core that the coax was wrapped around, so the presence of the
core doesn't affect them. The core only affects the CM signal.
On 21/04/2012 17:43, Frank wrote:
> Joe Subich, W4TV wrote:
> I have a basic question regarding CM chokes. My understanding is that
> you make a choke by windng the feedline around a form to create an
> inductance. If the inductance is sufficient it bucks the CM current
> trying to sneak back into the shack. All the conductors in the feedline
> are coiled. Even the center conductor is coiled and probably has
> inductance as well. Won't that buck the signal to the antenna? On
> receive as well as transmit.
> Could it be that preceived noise reduction is nothing more than a signal
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