[Elecraft] Re: K3 Firmware Update

wayne burdick n6kr at elecraft.com
Tue Jan 29 15:14:52 EST 2008


David wrote:

> I still think my RTC runs slow by about 8 seconds over 48hrs, but the 
> jury
> is still out on that one and if it does, I doubt there is much you can 
> do.

The spec is +/- 2 seconds per day, so you're a little high. This means 
that the real-time-clock chip's 32 kHz oscillator is running slowly. 
You could slightly reduce the size of the associated capacitor(s) until 
the frequency is exactly 32768 Hz (2^15). If you try this, use very 
light coupling to the crystal, because even 1 pF will shift the 
frequency significantly.

I have a long-term project on the wish list that would allow you to 
enter an RTC clock correction in a menu entry. A few other things to do 
first  ;)

73,
Wayne

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