Mike Coslo wrote in
:

But that brings up something interesting. You're reading 50 Ohms on
the input connector? Isn't that going to make *all* readings somewhere
near 1:1?

If you look at the circuit, there is a DC path from the centre pin, via the
50 ohm resistor that forms part of the measurement bridge, and an RFC to
ground. That would look like 50 ohms at DC, but it will not prevent the
measurement bridge working in the way you suggest.

Owen