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
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