[Elecraft] KBT2 charging question

[Mike Markowski]

Thanks, Don & Tom, for your help.  Now I'll scout around the web for the Astron
schematic and try to find that pot.

I'm still debating whether to build a K1 to bring along to places with me or to
build a fully kitted K2 QRP cover (ant. tuner and battery).  The K2 cover is
cheaper, the K1 building is more fun.

73,
Mike  ab3ap

Don Wilhelm wrote:
> Mike,
> 
> The 'float voltage' that must be applied to an SLA battery terminals should
> be 13.8 volts to maintain a full charge on the battery.  The K2 has a series
> diode in the power supply line for reverse polarity protection - that diode
> drops about .2 volts.
> 
> What that means is: to obtain 13.8 volts at the battery terminals, one must
> connect a supply of 14.0 volts to the K2 to maintain full charge on the
> battery.
> 
> There is an intenal pot in the Astron to adjust the output voltage, so it
> may be a simple matter to increase the Astron voltage - locating the correct
> pot may be more of a challenge, be certain you adjust the proper pot.
> 
> 73,
> Don W3FPR