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Old 10-06-2013, 05:08 AM   #1
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GPS to Radio-Controlled Atomic Clock


The purpose of this simple DIY project is to build an electronic circuit that received the GPS time signal, convert it to the radio-controlled clock format, and transmit that signal to the clock. Once built, there is no need for setup and maintenance, all you need is put this unit close to the window to receive GPS signal, and it will transmit the time signal to your radio-controlled clock.




Last edited by kwikfishron; 10-06-2013 at 05:33 AM. Reason: Removed Link
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Old 10-06-2013, 12:40 PM   #2
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GPS to Radio-Controlled Atomic Clock


It is illegal to transmit on the WWVB frequencies.

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Old 10-06-2013, 02:24 PM   #3
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GPS to Radio-Controlled Atomic Clock


Why would this be useful? WWV and WWVB receivers work pretty reliably anywhere in the US, and many places beyond the US. I you're close enough to a window to get a GPS fix and send the data tot he clock via a low power RF link, then the clock should receive the standar time signal just fine. And as Oso said, there is no circumstance where it's legal to transmit on the NIST clock frequencies - although at 60kHz with a small antenna and low power, you'd have a hard time transmitting more than a few feet.
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Old 10-06-2013, 07:21 PM   #4
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GPS to Radio-Controlled Atomic Clock


Where is the link to try and sell us stuff?
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Answers based on the 2008 & 2011 NEC.
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Old 10-06-2013, 07:35 PM   #5
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GPS to Radio-Controlled Atomic Clock


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Where is the link to try and sell us stuff?
I liked the diagram so I left that half of the spam.
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Old 10-06-2013, 08:37 PM   #6
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GPS to Radio-Controlled Atomic Clock


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It is illegal to transmit on the WWVB frequencies.
This is why I deliberately make the output very low power. The wire loop "antenna" has a Q of less than one. It is actually coupling magnetic field to the clock instead, so it is more like a transformer than an antenna. The tested range is only three feet. Therefore, to use this design, it is recommended to put the wire loop close to the clock.
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Old 10-06-2013, 08:42 PM   #7
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GPS to Radio-Controlled Atomic Clock


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Where is the link to try and sell us stuff?
I am not trying to sell you anything. It is free for you to download. It is just a project that I think might be useful for someone who has difficulties in getting the clock signal. There are similar products on the market, such as this one for large facility such as schools or hospitals:

XR Series Transmitters
www.primexwireless.com/our_products/synchronized_time_solutions/gps_clock_synchronization/xr-series-transmitters

But I cannot find similar products for family homes. In Europe, I think there is such a legal product that trnasmit the time signal, but unfortunately, has no GPS interface:

Time Signal Generator Shop Floor Booster:
www.c-max-time.com/products/showProduct.php?id=36
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Old 10-06-2013, 08:46 PM   #8
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GPS to Radio-Controlled Atomic Clock


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Originally Posted by mpoulton View Post
Why would this be useful? WWV and WWVB receivers work pretty reliably anywhere in the US, and many places beyond the US. I you're close enough to a window to get a GPS fix and send the data tot he clock via a low power RF link, then the clock should receive the standar time signal just fine. And as Oso said, there is no circumstance where it's legal to transmit on the NIST clock frequencies - although at 60kHz with a small antenna and low power, you'd have a hard time transmitting more than a few feet.
Just go to sourcefprge and search for "GPS to Radio-controlled Clock". As you see that sourceforge is for free source code, so this is not a spam. It is good that administrator always look out for spam. But I think someone can benefit from this design, and so this is why I posted it.
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Old 10-06-2013, 09:12 PM   #9
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GPS to Radio-Controlled Atomic Clock


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I you're close enough to a window to get a GPS fix and send the data tot he clock via a low power RF link, then the clock should receive the standar time signal just fine.
Not true if the wall of your house is made of concrete. The 60kHz cannot penetrate concrete walls, but you can still hide this unit in a place close to the window (maybe put it behind a window decoration, for example) and bring a wire to close to your clock.
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Old 10-06-2013, 11:39 PM   #10
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GPS to Radio-Controlled Atomic Clock


Your device is really a poor solution, in search of a problem.

A lot of people I know don't even use clocks and watches. Just their smart phone.

PS: no matter how low your power, it is still illegal.
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Old 10-07-2013, 01:33 AM   #11
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GPS to Radio-Controlled Atomic Clock


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Your device is really a poor solution, in search of a problem.

A lot of people I know don't even use clocks and watches. Just their smart phone.

PS: no matter how low your power, it is still illegal.
Maybe you should suggest a solution instead. If you don't have a solution, then how poor is this one? Or actually you don't even understand the problem. A lot of people I know don't like to wear watches and use smart phone. Wall clocks are used for time telling as well as for decoration. Actually, almost anything DIY is illegal since it does not pass FCC and EMI tests and UL safety standard. Try build you own 10W switching power supply and the radiated power output will be much higher.


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