On Mon, 30 Aug 2010 16:12:40 GMT, Manlio wrote:

Suddenly my Navtex receiver NX300 failed on NMEA input, shorting the
signal input. I proved that as the NMEA sentences was restored as soon
as I open the NX300 input.
Anyone had the same problem and may suggest a solution ?

I'm not familiar with the NX300 but why does a NAVTEX receiver need a
NMEA input ? I've had good luck with Furuno tech support on some of
my other stuff.