[R-390] Re: Looking for a C adaptor

[glwebb at gundluth.org]

Tom,

I like your twin-ax to BNC adaptor.  Here is a description of one I
inherited.

My R390A came with an adaptor that was made by the previous owner and
it keeps the balanced input ungrounded.  It consists of a 1 inch cube of
double
sided circuit board pieces soldered together. One side of the cube is open
with a cover of thin metal like is used for magnetic shielding. One side of
the box has a female panel mount BNC connector. Inside the box is a two
hole ferrite balun core with windings;  a primary and a secondary.  I
haven't checked the ratio of the windings but I presume them to be 1:1.
Secondary is connected to two insulated  pins from the box spaced  to fit
the
input to the radio.  It works very well and doesn't require any difficult
to find parts.

Gary L Webb NI9V