[time-nuts] Electronically Disciplined Mechanical Pendulum

Tom Van Baak tvb at LeapSecond.com
Mon Jun 8 17:46:50 EDT 2015

Hi Bert,

Thanks for posting that project. What a wonderful combination of electronic and mechanical timing, of design and measurement, of hardware and software, of PICs and Python.

One side experiment that would be interesting is to collect a couple of days of data using a fixed drive and then compare that with the same number of days using your adaptive FLL drive. The resulting phase or rate or ADEV plots would be amazing.


----- Original Message ----- 
From: "Bert, VE2ZAZ" <ve2zaz at yahoo.ca>
To: <time-nuts at febo.com>
Sent: Monday, June 08, 2015 10:11 AM
Subject: [time-nuts] Electronically Disciplined Mechanical Pendulum

> Greetings,
> I just want to let those who are curious about disciplining a mechanical pendulum that I have pretty much wrapped up playing with a 1m-long pendulum, which I control with PIC micro firmware and try to mainain at a constant temperature. Accuracy for 20-second averaging is typically better than 1 ppm. I have documented my work here:
> On my website ( http://ve2zaz.net/Pendulum_Ctl/Pendulum_Ctl.htm ),
> On Youtube ( https://www.youtube.com/watch?v=7NdGX4A8W88 )
> Thanks,
> Bert, VE2ZAZ

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