My feeling was that a fairly small battery could run the weight adjuster
for a year or two. It has to power some type of RF receiver to pick up a
locally broadcast time signal (probably on 2.4GHz). Given that it can
characterize the local crystal, the actual 'on time' of the receiver would
be
Like you all, I have always thought it would be fun to mess with a
pendulum clock. Since I have one already what stands in the way? Well my
Wife might think very differently about a few screws and wires in that
clock. At the other end of the spectrum is Bill S. beautiful clocks he has
built. Not
jfitzger...@alum.wpi.edu said:
> You guys have me thinking about another "non cheating" technique.I am now
> imagining a small gear motor/screw arrangement that raises or lowers a mass
> on the pendulum to trim out small variations in swing frequency.
How are you planning to get power
I had a design for something like that which I could hang on the back of a
pendulum and screw a weight up and down (actually I was going to move the
whole device up and down). The problem was that it would impose significant
air resistance and actually prevent the clock from running. I believe
Hi,
On 2021-03-11 00:38, Bob kb8tq wrote:
> Hi
>
>> On Mar 10, 2021, at 4:57 PM, Magnus Danielson wrote:
>>
>> Hi,
>>
>> On 2021-03-10 17:04, Bob kb8tq wrote:
>>> Hi
>>>
On Mar 10, 2021, at 9:39 AM, Charlie wrote:
Bob-
As a rank amateur e astronomer, I am a lurker. I
Hi
> On Mar 10, 2021, at 4:57 PM, Magnus Danielson wrote:
>
> Hi,
>
> On 2021-03-10 17:04, Bob kb8tq wrote:
>> Hi
>>
>>> On Mar 10, 2021, at 9:39 AM, Charlie wrote:
>>>
>>> Bob-
>>>
>>> As a rank amateur e astronomer, I am a lurker. I am amazed at what I have
>>> learned here. I know that
On Wed, Mar 10, 2021 at 2:21 PM Bruce Griffiths
wrote:
>
> Unless something akin to VLBI or pulsar timing is involved millisecond
> accuracy will usually suffice for amateur astronomy.
I think some of the most demanding requirements for optical astronomy
by amateur/semi-pros are set by
Hi,
On 2021-03-10 17:04, Bob kb8tq wrote:
> Hi
>
>> On Mar 10, 2021, at 9:39 AM, Charlie wrote:
>>
>> Bob-
>>
>> As a rank amateur e astronomer, I am a lurker. I am amazed at what I have
>> learned here. I know that there are differences between the meaning of
>> precision and accuracy, but
Unless something akin to VLBI or pulsar timing is involved millisecond accuracy
will usually suffice for amateur astronomy.
Bruce
> On 11 March 2021 at 06:31 Bob kb8tq wrote:
>
>
> Hi
>
> > On Mar 10, 2021, at 12:17 PM, Attila Kinali wrote:
> >
> > On Wed, 10 Mar 2021 06:39:46 -0800
> >
Hi Philip,
I have read about the approach you described with a magnet on the
pendulum and a stepper adjusting a steel plate up and down. The one I saw
(on Hackaday) seemed to work very well.
I don't really see what the difference is between that method and the
method I used. My
You guys have me thinking about another "non cheating" technique.I am now
imagining a small gear motor/screw arrangement that raises or lowers a mass on
the pendulum to trim out small variations in swing frequency.
-Joe Fitzgerald
___
Hi
> On Mar 10, 2021, at 12:17 PM, Attila Kinali wrote:
>
> On Wed, 10 Mar 2021 06:39:46 -0800
> "Charlie" wrote:
>
>> My question is thus: It seems that procuring a more precise PPS/time output
>> unit is quite a bit more costly than what I have; even more costly is a unit
>> that has both
On Wed, 10 Mar 2021 06:39:46 -0800
"Charlie" wrote:
> My question is thus: It seems that procuring a more precise PPS/time output
> unit is quite a bit more costly than what I have; even more costly is a unit
> that has both more precise PPS/time output,
The question is more whether it is good
I solved the rewind problem by putting an alarm on my phone for noon on
Sundays. During the pandemic, I'm always home, so that works out too!
On Wed, Mar 10, 2021 at 11:52 AM Dana Whitlow wrote:
> Philip,
>
> You and I are definitely "in sync" regarding cheating to alter the pendulum
>
Philip,
You and I are definitely "in sync" regarding cheating to alter the pendulum
motions!
I had a very similar thought for effectively making the pendulum based
system into sort
of a VCO, except that instead of a metal plate, use a small Nd magnet
polarized
vertically, stealthily-attached to
Hi
> On Mar 10, 2021, at 9:39 AM, Charlie wrote:
>
> Bob-
>
> As a rank amateur e astronomer, I am a lurker. I am amazed at what I have
> learned here. I know that there are differences between the meaning of
> precision and accuracy, but please correct my understanding if I am
> imprecise.
>
I was thinking about the discussion on synchronizing a grandfather clock
using a magnet and coil. Most methods for doing this use an external
power supply or a battery.
What about powering the synchronizing circuit from energy harvested
from the pendulum. Consider that you can get a quartz
I've been wanting to do this as well, but I feel that it is "cheating" to
actively drive the pendulum. I want to have a passive approach to
disciplining the clock so that the clock itself is keeping time.
One approach that I have seen was to put a magnet at the bottom of the
pendulum and then
Bob-
As a rank amateur e astronomer, I am a lurker. I am amazed at what I have
learned here. I know that there are differences between the meaning of
precision and accuracy, but please correct my understanding if I am
imprecise.
I have a need for precise time, as all sorts of
Hal,
The older (and probably the newer models, too) Trimble Thunderbolt GPSDOs
have
a user-adjustable time constant accessible via the serial port using a
program like
"Tboltmon.exe" (from Trimble). I suspect that "Lady Heather" may also do
this. I
am fortunate in owning a still functioning
Hi,
On 2021-03-10 14:23, Bob kb8tq wrote:
> Hi
>
>> On Mar 10, 2021, at 6:04 AM, Hal Murray wrote:
>>
>>
>> kb...@n1k.org said:
>>> The gotcha here is that if you want accurate *time*, you are better off
>>> using
>>> the sawtooth corrected output from a (good) GPS module rather than a GPSDO.
Hi
> On Mar 10, 2021, at 6:04 AM, Hal Murray wrote:
>
>
> kb...@n1k.org said:
>> The gotcha here is that if you want accurate *time*, you are better off using
>> the sawtooth corrected output from a (good) GPS module rather than a GPSDO.
>
> Why is that?
The controller gets in the way. If
kb...@n1k.org said:
> The gotcha here is that if you want accurate *time*, you are better off using
> the sawtooth corrected output from a (good) GPS module rather than a GPSDO.
Why is that?
I would have guessed that a GPSDO would average over many GPS pulses thus
reducing the noise.
Is it
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