| The following explanation covers the |
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| For other functions, go to the download page for Module 2578, |
| which is the export model that has the same functions, except for |
How a | Reception Range |
This watch is designed to receive the standard time calibration signal of Japan (JJY) or of the United States (WWVB). The signal that is | |
| received depends on the current Home City setting. |
What is a radio-controlled watch?
Your
Calibration Signal
• The Japanese calibration signal (Call Sign: JJY) is maintained by |
the independent Japan Ministry of Posts and Telecommunications |
Communication Research Laboratory (CRL). It is a long wave |
signal transmitted 24 hours a day from the Mt. Otakadoya |
| When this Home City is selected: | You can receive this signal |
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| Either the Mt. Otakadoya signal (40kHz) or the Mt. Hagane signal (60kHz) |
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| Fort Collins, Colorado signal |
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| Signal received using | |
Transmitter | |||
| calibration signal | Watch decodes | |
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| received data | |
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| and converts it | |
| Signal data | to time data. | |
| Decoding | ||
| Time data | Time is | |
Cesium | adjusted | ||
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Watch Inside the watch | according to | ||
atomic clock | |||
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| time data. | |
After the watch receives the Standard Time signal, it performs internal calculations to determine the current time. Because of this, there may be an error of up to one second in the displayed time.
transmitter (40kHz) located in |
and from the Mt. Hagane transmitter (60kHz) located on the |
border between Saga Prefecture and Fukuoka Prefecture. |
• The U.S. calibration signal (Call Sign: WWVB) is transmitted by |
the National Institute of Standards and technology from Fort |
Collins, Colorado. |
Though the calibration signal is normally transmitted 24 hours a day, transmission may be interrupted occasionally due to maintenance, lightening, etc.
| Transmitter Locations | 1000km | |
500km |
| Mt. Otakadoya |
500km | (40kHz) | |
Mt. Hagane |
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(60kHz)
1000km
•Under optimum conditions, the calibration signal should be receivable up to 1,000 kilometers from the transmitter. Note that the wave is relatively weak at distances greater than 500km, so reception may be poor at long distances.
| Transmitter Location | 3000km |
1000km
Fort Collins
•Under optimum conditions, the calibration signal should be receivable up to 3,000 kilometers from the transmitter. Note that the wave is relatively weak at distances greater than 1,000km, so reception may be poor at long distances.
•Geographic contours, nearby buildings, the season, and the time of day can make reception impossible even when you are within range of the transmitter.
•Best reception is possible late at night.
Location
Reception is difficult and may even be impossible in the locations described below. Avoid such locations when performing signal reception.
•You should think of your watch operating like a radio or TV when it is receiving the calibration signal.
Among or near buildings | Near |
Inside a vehicle | Next to a household |
(automobile, train, plane, etc.) | appliance or office equipment |
| (TV, speaker, fax, PC, etc.) |
Receiving the Calibration Signal
There are two methods you can use to receive the time calibration signal.
•Auto reception (Reception is performed automatically at 2:00, 4:00, and 6:00 each morning.)
•Manual reception (You initiate reception using a button operation.)
•The watch is set up for auto reception at the factory, so all you need to do is to place it in a location that allows good reception each night.
Setting Up to Make Reception Easier
Remove the watch from your wrist and place it somewhere so its top (12 o’clock side, where the antenna is located) is facing approximately in the direction of the signal transmitter. Keep the watch away from metal objects.
Resin band
Time Required for Reception
Signal reception takes anywhere from about two to six minutes.
•Note that when “A/T” (auto) is specified as the transmitter selection mode, signal reception can take up to 12 minutes.
*See “Specifying the Transmitter Selection Mode in Japan” for more information.Triggering Reception Manually
In the Timekeeping Mode:
Hold down the B button for about two seconds.• The watch beeps and reception starts. Ongoing reception is indicated by the 
icon and the receive indicator. See “Receive Icon and Indicator” for more information.
To interrupt reception
Press the B button.All other buttons besides B are disabled during signal reception.
When reception is successful
The watch adjusts its current time setting, and then beeps and displays the time and date of the adjustment.
Receive Icon and Indicator
While reception is in progress, the | Receive indicator | |||
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| icon and the receive indicator |
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| cycle from “Unstable” through |
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“Stable” as shown below. How far |
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they cycle depends on the signal |
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strength. Keep the watch in a |
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location where reception is stable |
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while reception is in progress. |
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Unstable
Receive icon
Stable
In a location where there is | Near mountains |
radio interference |
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(construction site, airport, etc.) |
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If you are experiencing problems with reception, move away from the types of locations described above to a location with better reception, and try again.
Metal band
•Orienting the watch so it is sideways to the transmitter makes it more difficult to receive the signal.
•Do not move the watch while it is receiving the calibration signal.
•The 
icon and the receive indicator remain on the display to indicate that reception was successful.
When reception fails
The watch does not adjust its current time setting, and displays “ERR” instead.
•The display also return to the normal timekeeping screen automatically if you do not perform any operation for about one or two minutes.
•Even under optimum reception conditions, it takes at least 10 seconds before reception starts.
•Use the receive icon and receive indicator to check reception status and to determine the best location for signal reception.
•Note that weather, the time of day, surroundings, and other factors can all affect reception.
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