Phil,
That is correct. The battery '+' and external supply '+' are connected
together. The voltage at the battery's negative terminal is measured
and subtracted from the voltage at the '+' side. So with no batteries
installed, 0V would be read at the batt '-' side. And when no external
supply is connected, BT and PS will also read the same. This is all
related to how the battery and external supply are isolated from each
other through the diode 'OR-ing' circuit that allows the higher voltage
of the two to power the radio.
73,
Rich AC7MA
On 07/15/2013 09:33 PM, Phil Hystad wrote:
On the KX3 VFO B Alternate Display you read Time, Power Supply Voltage, Battery
Voltage, and so forth.
So, my question is regarding the BT (Battery Voltage) display. I assume that
this reads the same as the external power supply voltage level (PS) if there
are NO batteries in the battery holder.
I never paid too much attention to this before and I have had batteries
installed almost from the time I put the KX3 together so I have not noticed
this before.
So, can someone confirm that if no batteries are used that BT shows the same
reading as PS? I can understand how this might make some sense but I think I
would prefer that BT show zero volts (or, N/A) or something if no batteries are
installed.
Thanks
73, phil, K7PEH
______________________________________________________________
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
______________________________________________________________
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
