Electronics > Beginners
Antenna in atomic clock
windsmurf:
The antenna's could be very tiny, like the ones found in Casio Waveceptor watches.
mikerj:
--- Quote from: fixit7 on May 03, 2019, 03:13:06 am ---The clock uses about 10 mA, but the converter uses about .2 Volt per day.
--- End quote ---
10mA is a ridiculous amount of current for a basic quartz controlled LCD clock, it should be down in the low microamps.
imisaac:
--- Quote ---I am wondering whether I bought a true atomic clock.
I took apart my clock and it does not have anything like this antenna.
https://www.dropbox.com/s/lsae0sulcd1r9zr/Antenna.png?dl=0
Is it supposed to have an antenna?
I assume it needs one to get updated on the time from the time server.
--- End quote ---
Just to clarify.
A true rubidium or caesium based atomic clocks would also have an antenna attached in order to sync with the UTC time broadcasted by the satellites.
A "clock" without antenna would represent some local oscillator for the convenience of timekeeping. It will have accuracy problem over time due to the relative drifts between your oscillator and the standards.
For easy identification in the future, you could look for some glass tubes and ovens on your board if the clock is based on the atomic standards.
For a serious identification, you should measure its long term frequency stability and time stability somehow and make sure that they are below 10-11.
BravoV:
--- Quote from: imisaac on May 03, 2019, 08:48:12 am ---
--- Quote ---I am wondering whether I bought a true atomic clock.
I took apart my clock and it does not have anything like this antenna.
https://www.dropbox.com/s/lsae0sulcd1r9zr/Antenna.png?dl=0
Is it supposed to have an antenna?
I assume it needs one to get updated on the time from the time server.
--- End quote ---
Just to clarify.
A true rubidium or caesium based atomic clocks would also have an antenna attached in order to sync with the UTC time broadcasted by the satellites.
A "clock" without antenna would represent some local oscillator for the convenience of timekeeping. It will have accuracy problem over time due to the relative drifts between your oscillator and the standards.
For easy identification in the future, you could look for some glass tubes and ovens on your board if the clock is based on the atomic standards.
For a serious identification, you should measure its long term frequency stability and time stability somehow and make sure that they are below 10-11.
--- End quote ---
Looking at the OP's photo of the clock and it's size, don't think that a true atomic clock can be powered just by simple common small batteries.
I'm pretty sure its just another common cheap LCD clock, maybe cost 5 or 10 bucks.
NivagSwerdna:
Atomic clock is a very generic term... It may have a Rubidium Standard, Caesium Standard or Hydrogen Maser inside but it is difficult to tell without pictures of the insides.
Looking forward to seeing some internal PCB shots.
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