Hi Bert
at the Neu Tecknicumbuchs, /Buchs/, Switzerland somebody made a "diplom
work" a quite-few years ego very similar clock, the pendulum was
synchronized to the 75kHz accurate time transmitter, you may could find
out more about it at the Neu Tecknicumbuchs, /Buchs/, Switzerland
73
KJ6UHN
Alex
On 6/9/2015 7:26 AM, Bert, VE2ZAZ wrote:
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
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