Seattle atomic clock

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Before it does so, it applies a time zone correction, based on the time zone setting that you supplied. While a few users like their clocks to display UTC ham radio operators, for example , most prefer to display local time. This means that the time in your area is corrected by the number of hours shown in the table. Once your radio controlled clock has synchronized, it won't decode the signal from WWVB again for a while. Most clocks only decode the signal once per day, but some do it more often for example, every 6 hours.

Those that decode the signal just once per day usually do it at midnight or in the very early hours of the morning, because the signal is easiest to receive when it is dark at both WWVB and at the site where the clock is located. In between synchronizations, the clocks keep time using their quartz crystal oscillators.

A typical quartz crystal found in a radio controlled clock can probably keep time to within 1 second for a few days or longer. Therefore, you shouldn't notice any error when you look at your clock display, since it will appear to be on the right second, even though it has probably gained or lost a fraction of a second since the last synchronization. The red areas on the coverage maps below show where a WWVB radio controlled clock should be able to synchronize.

Note that the red area is largest at night, and smallest in the daytime click on the map to see a larger image. These maps are based on a field strength of microvolts per meter, which in theory should be a large enough signal for most receivers to work with.

In fact, some receivers have much better sensitivity 20 or 30 microvolts per meter. However, simply having a large signal doesn't mean that the receiver will work. What really matters is the signal-to-noise ratio, or the size of the signal compared to the size of the electrical noise near the same frequency. Raising the noise level is just as harmful as reducing the signal level. For example, if the radio controlled clock is near a source of interference like a computer monitor the noise level will increase, and the clock might not be able to synchronize.

If the radio controlled clock is in a building with a metal roof, much of the signal will be blocked. Therefore, the signal level will be reduced, and the clock might not be able to synchronize. Therefore, use the coverage maps as a rough indicator only. We have heard from many owners of radio controlled clocks whose clocks do not work inside the coverage area shown on the maps.

This is probably due to a local source of interference. We have also heard several reports from Alaska that the clocks work fine, even though Alaska is outside the coverage area shown on the maps. This is probably due to the low amount of radio "background" noise found in a sparsely populated area. NIST provides the signal received by your radio controlled clock, but we cannot provide technical support for the clocks themselves. We didn't manufacture them, and we are not familiar with all the models or all of their features.

We recommend that you save the instruction sheet that came with your clock, so you can refer to in the future if necessary. Having said that, we can offer a few general tips about what to do if your radio controlled clock isn't displaying the correct time. Most WWVB radio controlled clocks work great, as evidenced by the hundreds of thousands of units that have been sold throughout the United States.

However, if your radio clock or receiver isn't working, we suggest:. Remember, minutes and seconds are the same in all time zones within the WWVB coverage area; only hours are different.