I tx you a "thank you" ! :-)
2013/4/16 Bruce Beford <[email protected]> > Rich, AC7MA explained this quite well on the KX3 Yahoo group just last > week: > > > > The batteries and external supply are connected at the '+' end. The > external > supply '-' is connected to KX3 ground, but not battery '-'. > > With an external supply connected that's higher than the battery voltage, > the battery '-' will be a positive voltage with respect to ground, so > battery voltage is the difference between the measurements of the two > terminals. If no batteries are installed, the battery '-' > > terminal is at ground potential, so the display for PS and BT will be the > same. When the KX3 is running from batteries, the reverse isolation diode > for the batteries puts the battery '-' slightly below ground, which will be > read as 0V, so PS and BT readout will also be the same in that case. > > > > 73, > > Rich AC7MA > > > > > Now just the question arises why the BAT display shortly raises to the > > input voltage if you connect the power? ... > > > Holger, DH3HS > > > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
