[Elecraft] Power Supply Voltae Question - K2

[Don Wilhelm]

Tom,

If your goal is to keep the internal battery fully charged, bump the PS
output up a bit more (to 14.4) - you apparently still have the older
protective SB530 diode in your K2 SN1103, for those with post SN3000 or
upgraded K2s the proper voltage will be 14.2 to 14.3 volts because diode D10
was changed to a lower forward drop 95SQ015 type.
If you want to be really correct, increase the voltage until the voltage at
the battery terminals is 13.8 volts at room temperature and with a fully
charged battery.  You may want ot set it to 14.4 volts and then check the
battery terminal voltage in a few days and refine the adjustment as
required.

The K2 is speced for up to a 15 volt supply voltage, so you will not hurt
anything with the increased voltage.

73,
Don W3FPR

> -----Original Message-----
>
>
> Hi all,
>   I was inside my power supply ( a Radio Shack 25 amp job)  today and
> decided to increase the output voltage to 14.0 volts.  I thought
> this would
> give me a bit of a boost in charging the internal battery of my K2 (low
> power version with a few optional add-ons).
>
>   I don't see anything wrong with operating at 14.0 volts (I only use the
> battery in the field and operate from the PS from home), but I
> thought I'd
> ask the list to be sure.  The display is showing 13.4 volts, which sounds
> about right for 14.0 from the PS.
>
> Thanks
> Tom WB2QDG
> K2 1103
>
>