On Tue,8/9/2016 1:56 PM, MaverickNH wrote:
Just wondering - short of +/- RF Burns and Audible Noice, can one readily
detect/measure Common Mode Current on a coax antenna feedline?
Yes. A calibrated RF current probe coupled to the outside of the coax
can easily measure common mode current. Here are a couple of easy ways
to do it.
http://www.ifwtech.co.uk/g3sek/clamp-on/clamp-on.htm
Note that because the coax is acting as part of an antenna for common
mode current, the current will vary along the line just as it would for
any other antenna. For example, the coax a simple wire dipole in an
earth-based station acts as a wire connected between the shield side of
the dipole and ground, with the length of the wire equal to the physical
length of the coax, and oriented in space as the actual coax is routed.
73, Jim K9YC
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