In article ,
"John W" wrote:

I am trying to put a co-ax line through the wall of my shack. I purchased
two chassis mount N-type connectors a while ago, one for inside and one for
outside the shack. As you will know these connectors have a solderable
centre pin for the co-ax inner conductor and seem to rely on the chassis for
the outer connection.

John-

The chassis mount N connectors should come with a "back shell" that
allows the center pin of Co-ax to be soldered, and the shield to be
soldered to the shell. If transmitting, you need to maintain the shield
to prevent your signal from being leaked from the unshielded wire. The
unshielded wire will act as both a loop antenna and an inductive
reactance in series with the center conductor.

As others suggested, feeding the Co-Ax through the wall may be the best
approach. There is a plastic tube available for doing that. It used to
be sold by Radio Shack as their model 15-1200A "Wall Feed-Through Tube",
but I can't find it at their web site.

Another approach is an MFJ-4602 "Window Antenna feedthru panel". It has
three Co-ax plus balanced, single wire and ground feedthroughs. The
panel is meant to be mounted on a window sill with the window closed
over it.

Fred
K4DII