[Elecraft] How accurate is Supply Voltage display (PS)

[Walter Underwood]

Yes, the KX3 has a diode to protect against reverse polarity. That has a voltage drop of about 0.3V.

wunder
K6WRU

On Jun 28, 2014, at 10:50 AM, ok4rm <radio.miskovice at gmail.com> wrote:

> Hello, I would like to know how accurate is the display of PS value. I
> suspect it always shows lower value by about 0.2 to 0.3 V. For instance,
> when I use Li-Po accupack 3S1P 3300 mAh that normally gives 35C, i.e. some
> 100 A (therefore I think it has no problem with internal resistance at low
> currents up to 5 A). 
> 
> When KX3 takes 168 mA and I measure 12.26 V on the battery, KX3 shows 12.0
> V. Then I turn on speaker and preamp and increase consumption to 250 - 300
> mA (i.e. almost double), but I still measure the same voltages, i.e. the
> difference is not caused by power supply cable.
> 
> Is some calibration possible? Or did I miss something (a schottky diode in
> KX3 prehaps)?
> 
> 73 Jindra
> 
> 
> 
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--
Walter Underwood
wunder at wunderwood.org