I have been looking antennas. Prices seem to range less than 30 dollars to
more than 500 dollars. Some are 20db gain and some are 40 db gain. Some are
specified as marine use only. Some are specified as timing use. Some doesn't
say anything at all. Power supplies are different.
Other than
You are not the first to try this. The usual method for timing mechanical
clocks is either acoustic (a microphone picks up the sound of the escapement)
or optical (a sensor is blocked from light by the pendulum). The optical method
is more accurate but more cumbersome to setup.
Matthew
Sent
Whenever Dollar Tree those solar cell powered "nodding" figurines on sale (for
$1) I pick one up (btw, they haven't had any for several months).
A friend of mine loaned me his 16 channel 10 ns FPGA based time stamping
counter. So, I picked out 16 different nodders (out of 100 or so unique
Somewhere, a few years ago, I saw a video in which a fairly large number of
metronomes
were mounted on a common base and exhibited some interesting injection
locking
behavior.
Personally I keep thinking of phase locking a G'father clock to a Rb
standard. The trick
will be to do so in a manner
On Wed 2019-11-20T16:51:00-0900 Bill Beam hath writ:
> Most people interested in this problem have been dead for about 200 years.
Au contraire. The BIH started operations early in the 1920s and those
volumes of BIH Bulletin Horaire are scanned online. The first 20
years relied largely on
On 11/20/19 5:51 PM, Bill Beam wrote:
On Tue, 19 Nov 2019 20:10:14 -0500, Philip Gladstone wrote:
I've started to monitor the individual ticks on a grandfather clock from
the 1790s. Essentially I timestamp whenever the pendulum breaks/restores a
light beam.
The data that I get is surprising
On Thu, Nov 21, 2019 at 2:01 AM Bill Beam wrote:
> Most people interested in this problem have been dead for about 200 years.
>
> I knew there was a reason why I didn't feel so well lately ..
I have an electric pendulum clock by Bulle. A coil swings in a short arc,
following a curved magnetic
On Tue, 19 Nov 2019 20:10:14 -0500, Philip Gladstone wrote:
>I've started to monitor the individual ticks on a grandfather clock from
>the 1790s. Essentially I timestamp whenever the pendulum breaks/restores a
>light beam.
>The data that I get is surprising in that the pendulum swing varies
Hi Philip,
For low rate measurements like a pendulum clock the timestamping method
works well. A number of us do it that way. The same method works for
GPS/1PPS-like signals and also mains (raw 50/60, or divided down to 1) Hz.
Correct, if your measurements are precise enough, you should see
On Wed 2019-11-20T11:35:51+ Peter Vince hath writ:
> As I mentioned in a previous message about observed anomalies with the DST
> change on DCF77, Pieter-Tjerk in the Netherlands noted that the time
> encoded on the phase-modulated carrier of the BBC's 198KHz signal in the UK
> was about 900
I've started to monitor the individual ticks on a grandfather clock from
the 1790s. Essentially I timestamp whenever the pendulum breaks/restores a
light beam.
The data that I get is surprising in that the pendulum swing varies
according to the position of the hands on the clock. It appears that
As I mentioned in a previous message about observed anomalies with the DST
change on DCF77, Pieter-Tjerk in the Netherlands noted that the time
encoded on the phase-modulated carrier of the BBC's 198KHz signal in the UK
was about 900 milliseconds early. Having queried that with a contact in
the
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