[Elecraft] K2 Voltage Display

Fri Feb 14 19:07:01 2003

Gordon:
  If you are reading the p/s voltage at the supply, it will be higher than 
the display by about .7v because of the polarity-check diode in the K2. 
Actually, it would typically have greater disparity under tx, because any R 
in the power cable to the K2 would cause further voltage drop.  You won't 
notice this too much under rx when the current draw is low, but you will 
under tx when the current draw is high.

best wishes,

dave belsley, w1euy

--On Friday, February 14, 2003 10:52 PM +0000 Gordon Gibson 
<[email protected]> wrote:

> Hi All
>
> How accurate should the voltage display be ?
>
> The display on my K2 #2746 appears to read .7v low,  since my K2 was
> completed last August I have only operated it from the shack, and never
> gave the voltage display much thought, however I intend to go /p this
> Spring and Summer so have been getting ready for that, and charged up my
> Hitachi 12v 6.5A battery, it was when I connected to the battery I
> realised the Battery Volts were different to the K2 Display, so I checked
> the voltage of my Drae Power Supply and it too is reading .7v higher than
> the K2 Display!
>
> okay .7v is not a lot but I would like to use the display to keep an eye
> on my battery when out /p at the moment my Battery reads 12.3v and the K2
> display 11.6v.
>
> So is the Display only relative ? or do I need to change the values of the
> Potential Divider on the control board, i.e. R9, R10 ? in order to get the
> display to read my true battery voltage ?
>
> 73 de Gordon G3ZFZ
>
> [email protected]
>
>
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----------------------------------
David A. Belsley
Professor of Economics