Chris,
I wouldn't do it.  You would have to retain the coaxial part of coax 
and that would be very difficult.  Also, whatever insulation you 
placed around the center conductor would probably have different 
dielectric properties than what the cable has and that would screw 
things up as well.  You could place connectors on the ends of the 
pieces and use a barrel connector to connect them.  That would work fine.
Sorry to rain on your parade.
Pat, K9JAU At 03:27 PM 3/7/2011, you wrote:
>Hello,
>Is it a good idea to splice coax?  I wouldn't consider it for an outdoor
>run but what about indoors?
>
>Chris