[Elecraft] Diode voltage drop [Was: Re: Elecraft digest, Vol 4 #206 - 27 msgs]

[Neill Taylor]

Dave GW0LUA wrote:
>Since the rig was designed with the diode voltage drop in mind, why
>doesn't the firmware simply add the voltage drop to the figure for the
>displayed voltage?  This would be less confusing for folks who notice the
>disparity.  You'd expect the drop to be between 0.6 and 0.7 volts, so
>adding (say) 0.65 to the displayed voltage would be much closer to
>reality.  After all, the rig is supposed to be displaying the *supply*
>voltage, not the internal voltage after the diode drop.

Another issue that no-one has mentioned yet is that the diode in question, 
D10, was changed to un ultra low-drop type in the progression from K2 Rev.A 
to Rev.B.  It's now only 0.1 - 0.2V.  So for older, un-modified Rev.A rigs 
the correction to the displayed voltage is different to that for Rev.B or 
upgraded rigs.

Neill
G4HLX
K2/100 #2425