Hi to all
The accuracy of the KXBC3 clock is at best marginal ...
But ... Looking at the schematic of the KXBC3, the real time clock seems
to be a part of chip PIC24F16KA10. And a reference to that chip says this:
29.3.9 Calibration
The real-time crystal input can be calibrated using the periodic
auto-adjust feature. When
properly calibrated, the RTCC can provide an error of less than 3 seconds
per month. This is
accomplished by finding the number of error clock pulses and storing the
value into the lower half
of the RCFGCAL register. The 8-bit signed value loaded into the lower half
of RCFGCAL is
multiplied by four and will be either added or subtracted from the RTCC
timer, once every minute.
Refer to the steps below for RTCC calibration
(Reference: http://ww1.microchip.com/downloads/en/DeviceDoc/39696b.pdf )
So I wonder if some calibration could be done via a software mod. My KXBC3
clock gain about 15 seconds per week ... far away from 3 seconds per month
... ??
73 de Pierre VE2PID
--
Utilisant le logiciel de courrier d'Opera : http://www.opera.com/mail/
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