[Elecraft] K3 Voltage on TX

[Bob McGraw - K4TAX]

Seems to me the display on VFO B is accurate enough for this purpose.  
Now to make sure of the accuracy along with voltage drop, measure the 
voltage at the power supply terminals.  I would expect the voltage at 
the power supply terminals and the VFO B display in receive mode to be 
identical, +/- meter accuracy.

As Don said, diodes or no diodes, the objective is voltage drop at the 
radio between RX and TX full power.  I would perceive anything greater 
than 0.5 volts as shown on the VFO B display is reason for one to  
investigate the station DC power distribution.

73
Bob, K4TAX
K3S s/n 10163

On 10/26/2015 8:02 PM, Don Wilhelm wrote:
> Dick,
>
> If the main interest is the drop in voltage, the 12V jack will work 
> fine, no matter how many diodes are in series with it.
> So you get 10 volts during RX and 9 volts during TX, that is a 1 volt 
> drop (OK, that is extreme, but hopefully makes the point).
> If you are instead looking for the absolute voltage delivered to the 
> K3, use the VFO B voltage display.
>
> 73,
> Don W3FPR