Yes, it's "surprising" how much surprise there seems to be that the KX3 (and almost any other ham rig) DC power connector's negative terminal connects ultimately to the case.
Let me "flog a dead horse". This whole affair amounts simply to this: 1. The KX3 case and the power supply's negative output were tied together through an owner-established conduction path that was independent of the KX3 power cable. 2. The KX3 power cable was carelessly installed such that power supply positive output was on the KX3 power connector's negative terminal. 3. When the KX3 power connector was applied to the KX3, the power supply's positive terminal was shorted to its negative side through the power cable and KX3 case and whatever external conduction path the owner had established between the KX3 case and power supply negative. The KX3's D6 polarity protection diode did not come into play in any manner. It is common good practice for DC power cables to have fuses in BOTH the positive AND the negative leads. That would have prevented power cable damage here. Mike / KK5F -----Original Message----- >From: David Woolley <for...@david-woolley.me.uk> >Sent: Sep 6, 2020 7:14 AM > >See page 3 of ><https://ftp.elecraft.com/KX3/Manuals%20Downloads/KX3SchematicDiagramDec2012.pdf> > >for confirmation that the KX3 chassis is connected to the the same >network as the negative supply to the internal components. > >On 05/09/2020 19:32, Alan - G4GNX wrote: >> I'd be very surprised if Elecraft had connected the negative supply to >> chassis ground inside the KX3 either. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
