[time-nuts] Re: Domestic time pulse transmission

[Magnus Danielson]

John,

Depending on the details, there is a few different options.

One is naturally to steer something that measures and which returns 
measures as time-stamps over say WiFi.

A more direct approach can work in some cases, where you beam an RF 
frequence (which naturally needs to be a frequency allowable for the 
purpose in your country) onto the pendulum and then measure on a 
receiver either reflection or transmission. This is directly comparable 
to using a laserbeam in similar fashion, and that is an option too. 
Probably this approach will not be possible, because of how other things 
like doors, humans and house anminals will disturb things, so you need 
to revert back to the first approach, steer something so you can use 
that to measure.

You end up having to put some logic inside that. Be it an ESP32, 
Beaglebone or RPi. I would probably go with the RPi due to my higher 
familiarity with it. If you can put a GPS receiver in there, you can use 
it's PPS as timing reference and it will be far better and fairly 
straight-forward than anything you do. You will probably not have to go 
all the way to TICC for time-stamping, but if you feel extra time-nutty, 
that is where you will be heading.

I have considered doing something simliar.

Cheers,
Magnus

On 2023-08-04 11:47, john.haine--- via time-nuts wrote:
> I'm wondering if the group wisdom could help me work out a good way to send
> a ~1pps pulse from a mechanical clock to a time monitoring system?  This is
> for a pendulum clock project where the clock is electronically controlled
> and I want to measure its timekeeping remotely to avoid having to build the
> time reference and logging R-Pi into the case.  I do not want to have to run
> a cable from the room where the clock will be to the place where the logging
> is done, so the options are radio or using the mains wiring (the clock will
> be mains powered with battery backup).  Obviousy there are options such as
> the cheap 433MHz transceivers that are available which I am investigating,
> but does anyone here have any experience of techniques that work (or, just
> as importantly, don't work!) please?
>
>   
>
> John.
>
>   
>
>   
>
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