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Operation Guide 5002 (GMS)
2
How a Radio-controlled Watch Works
Receiving a Calibration Signal
There are two methods you can use to receive the time calibration
signal.
Auto receive
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.
Manual Receive
You initiate signal reception by pressing a button.
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In the Timekeeping Mode, hold
down the
B
button for about
two seconds.
•
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
Press any button.
At the start of the 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”.
While reception is in progress
•
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 reception is complete...
•
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.
What is a radio-controlled watch?
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.
Calibration Signal
•
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.
http://jjy.nict.go.jp
•
Note that the above URL is subject to change.
■
To check the result of the last receive
operation
In the Timekeeping Mode, press the
B
button.
This will enter the last signal receive mode. The day hand
will move to “Y” (if the last reception was successful) or “N”
(if the last reception was unsuccessful).
•
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
reception
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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Time Required for Reception
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.
Reception Ranges
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.