Hi Tom, Thanks a lot for your feedback and for having been an inspiration for this project.
With a temperature-stabilized setup, it is now concievable to run the system at a constant impulse duration. This would not have been possible without temperature control, as the pendulum arm length varied too much to maintain an oscillation using a constant impulse width. I tried this overnight at a couple of occasions with an aluminium arm, only to find the pendulum dead in the morning... :-o So in order to achieve this, I will add a serial command to keep the last impulse duration. That command would be sent once the system is fully stabilized. Thanks, Bert, VE2ZAZ Message: 8 Date: Mon, 8 Jun 2015 14:46:50 -0700 From: "Tom Van Baak" <[email protected]> To: "Discussion of precise time and frequency measurement" <[email protected]> Subject: Re: [time-nuts] Electronically Disciplined Mechanical Pendulum Message-ID: <ED4D31631FC440A19A71631386F46143@pc52> Content-Type: text/plain; charset="utf-8" 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. /tvb ----- Original Message ----- From: "Bert, VE2ZAZ" <[email protected]> To: <[email protected]> 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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
