[time-nuts] How to get 32.768KHz from 10MHz.

John Franke jmfranke at cox.net
Wed Jul 23 11:11:39 EDT 2008


The only thing that comes to mind is to divide the 10 MHz by 2500000 
(5x5x100000) and then use a phase locked loop to multiply by 8192.  Of 
course the PLL would best control a varactor with a clock crystal vice 
controlling an RC oscillator.  Other divisor multiplier pairs are: 
1250000/4096, 625000/2048, 312500/1024, 156250/512, and 78125/256.

John  WA4WDL

----- Original Message ----- 
From: "Max Skop" <mskop at bigpond.net.au>
To: <time-nuts at febo.com>
Sent: Wednesday, July 23, 2008 10:09 AM
Subject: [time-nuts] How to get 32.768KHz from 10MHz.


> How does one get a 32.768KHz signal from our 10MHz reference.
> There does not appear to be a nice divide ratio to do this.
> With a locked 32.768KHz signal one could lock the oscillator of  any of 
> the cheap (low cost) LCD clocks that are available with nice big digits, 
> temperature sensors and calendars, etc.
> Any suggestions on how to do it??
>
> Regards
> Max
>
> ps. I got sucked in good. Six months ago all I had was an HP 10811 and now 
> I have another crystal oscillator, two rubidiums and a Trimble GPS.
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