Casio 0811-EA User Manual

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There are two methods you can use to receive the time calibration 
signal. 

Up to six times per day
(Midnight, 1:00, 2:00, 3:00, 4:00, and 5:00 a.m.) 
•  As soon as one auto receive is complete, all subsequent auto 

receives for that day are cancelled. 

You initiate signal reception by pressing a button.

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B

•  The day hand will indicate the 

result of the reception, and then 
move to “READY” (“R” for some 
models).

■ To cancel a manual receive operation 

•  The day hand will move to “READY” (“R” for some models).

•  The hour and minute hands will remain at their normal positions. 

•  The second hand will stop at “60”. 

•  The day hand will move to “WORK” (“W” for some models).

•  The hour and minute hands will remain at their normal positions. 

•  Do not move the watch while signal reception is in progress (second 

hand at “WORK”). 

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•  When the receive operation is successful, the day hand will move 

to “Y”, and then after about fi ve seconds the watch will adjust its 
time and normal timekeeping will resume. 

•  When the receive operation is unsuccessful, the day hand 

will move to “N”, and then after about fi ve seconds the normal 
timekeeping will resume. 

A radio-controlled watch is designed to receive a time calibration 
signal that contains standard time data and adjust its current time 
setting accordingly. 

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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. 

•  The Japanese calibration signal (Call Sign: JJY) is maintained 

by the National Institute of Information and Communications 
Technology (NICT). It is transmitted 24 hours a day from the Mt. 
Otakadoya transmitter (40 kHz) located in Tamura-gun, Fukushima 
Prefecture, and from the Mt. Hagane transmitter (60 kHz) 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. 

•  Time calibration signal frequencies and transmitter locations 

are subject to change. The time data of the Japanese 
calibration signal (Call Sign: JJY) is maintained by the 
Japan Standard Time Group of the National Institute of 
Information and Communications Technology (NICT). Note 
that transmission of the calibration signal may be interrupted 
occasionally due to maintenance, lightning, etc. For more 
information, visit the website of the Japan Standard 
Time Group of the National Institute of Information and 
Communications Technology (NICT) at the following URL.

•  Note that the above URL is subject to change. 

■ To check the result of the last receive 

B button.

• Press the B button once to return to normal timekeeping. 

•  The watch also will return to the Timekeeping Mode automatically 

if you do not perform any operation for about fi ve seconds. 

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The last receive status changes each time a new time 
calibration signal reception operation is performed. 

■ To position the watch for optimum 

Remove the watch from your wrist and place it somewhere so 
its top (12 o’clock side, where the antenna is located) is pointing 
approximately in the direction of the signal transmitter. Keep the 
watch away from metal objects. 
•  Orienting the watch so it is sideways to the transmitter makes it 

more diffi cult for it to receive the signal. 

•  Do not move the watch while it is receiving the calibration signal. 

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Signal reception normally takes anywhere from about two to seven 
minutes. 
Under certain signal conditions however, the receive operation can 
take as long at 14 minutes. 

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Certain conditions can make reception impossible even when the 
watch is within one of the reception ranges shown above. 
Signals become weaker outside of the smaller circles indicated by 
dashed lines in the nearby maps, so the reception environment has 
a greater effect on signal reception. 
•  The following also can affect signal reception: geographic contours, 

structures, weather, climate, time of day (afternoon, evening), 
noise.

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. 
•  For information about selecting a Home City and city codes, see “To 

confi gure Home City settings”.

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•  Signal reception also is possible in Hong Kong (HKG) when 

reception conditions are good.