[RFI] Balanced-line antennas and couplers

[Rob Atkinson]

>IF -- this is not always *necessary* -- we want to see if currents in a 2-wire feedline are unbalanced, I think a symmetrically placed ferrite core of appropriate diameter around >BOTH conductors, with a "secondary" winding feeding a sensitive meter or 'scope (etc) is the way to go.

>Also, we need to be aware that surplus thermocouple ammeter calibration may not be as good as our other and modern instruments; OT's know this -- and when to put up with >it.


Excellent points.  identical toroidal coils as pickups, one on each
side and at the same location is an excellent way to go.  they can
feed a dual trace scope and you can see both phase and amplitude.
Mike WZ5Q has integrated this approach in a home brew link tuner of
his.

73

Rob
K5UJ