Electronics > Beginners

Antenna in atomic clock

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Richard Crowley:
There are many posts and discussions about "atomic" (rubidium) oscillators that are used by every cell phone tower. Many are available on Ebay, etc. which have been replaced for whatever reason.  And the laboratory-grade equipment (like the HP, etc.) is widely discussed and available to hobby-level volt-nuts. There are many videos on YouTube about these things.

There will be latency no matter what standard, source, distance etc.  But that is a different factor than accuracy, stability, etc.

soldar:

--- Quote from: BravoV on May 03, 2019, 09:03:10 am --- I'm pretty sure its just another common cheap LCD clock, maybe cost 5 or 10 bucks.
--- End quote ---

I have bought them for a dollar at the dollar store.

Makes me think about how a throw-away dollar clock of today can keep time better than extremely expensive mechanical chronometers of just fifty years ago.

For celestial navigation purposes I have checked the rate of many cheap quartz clocks over several years and they can be incredibly stable. What is important is that the rate at which they run fast or slow is stable. Later you just correct for this when taking readings.

fixit7:

--- Quote from: NivagSwerdna on May 03, 2019, 01:40:05 pm ---
--- Quote from: fixit7 on May 02, 2019, 07:47:22 pm ---I am wondering whether I bought a true atomic clock.

--- End quote ---
Wonder no more... you didn't.

PS
Someone else seems to have also given this model more attention than it deserves... https://mysku.me/blog/china-stores/48540.html

--- End quote ---

You are right.

LaCross came up with the design while others copied it. (Minus the radio controlled part.)

fixit7:

--- Quote from: PA0PBZ on May 03, 2019, 01:45:30 pm ---
--- Quote from: fixit7 on May 03, 2019, 01:37:14 pm ---I have to manually set time when changing batteries. How could a radio controlled clock maintain the time if it has no power?

--- End quote ---

It doesn't, it gets the time over the radio, that is why it is called radio controlled.

--- End quote ---

So there are radios that do not need power? A little hard to believe.

ruffy91:

--- Quote from: fixit7 on May 03, 2019, 06:13:58 pm ---
--- Quote from: PA0PBZ on May 03, 2019, 01:45:30 pm ---
--- Quote from: fixit7 on May 03, 2019, 01:37:14 pm ---I have to manually set time when changing batteries. How could a radio controlled clock maintain the time if it has no power?

--- End quote ---

It doesn't, it gets the time over the radio, that is why it is called radio controlled.

--- End quote ---

So there are radios that do not need power? A little hard to believe.

--- End quote ---
It does not maintain time without power. It does receive the time via radio after power is supplied via the battery..
This typically takes a few minutes.

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