[Elecraft] accurate time

[hb9brj]

Lyle Johnson wrote:
> 
>> While on the subject of time, where is the oscillator that is used by  
>> the built-in clock on the K3?
> 
> Front panel board.
>> Is it adjustable?
> No. Sorry...
> 

U16 is the RTC (real-time clock) chip: 
http://www.nxp.com/acrobat_download/datasheets/PCF8563_6.pdf PCF8563 
In theory, frequency pulling is possible via C60 while monitoring CLKOUT
(32768Hz) on pin7. The datasheet recommends a 5...25pF trimmer capacitor.
In reality this might be difficult since U16 must be powered up during the
alignment...

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