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How a Radio-controlled Watch Works
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.
Signal is received by
built-in antenna.
Transmitter
Long-wave time
calibration signal
Watch decodes
received data and
Signal data
converts it to time
data.
Decode
Time data
Time is adjusted
Cesium
according to time
atomic clock
Watch
Internally
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.
To check the result of the last receive
operation
In the Timekeeping Mode, press the A
A
A button to renter the
A
A
Receive Result Mode, which displays the last receive result.
• The indicator hand will move to "Y" (if the last reception was
successful) or "N" (if the last reception was unsuccessful).
• Press the A button to return to the Timekeeping Mode.
• The watch also will return to the Timekeeping Mode automatically
if you do not perform any operation for about five seconds.
Y: Successful
N: Unsuccessful
The last receive status changes each time a new time
calibration signal receive operation is performed.
Operation Guide 4343
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 standard
wave 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 position the watch for optimum
reception
Remove the watch from your wrist and place it somewhere so its top
(12 o'clock, where the antenna is located) is facing approximately in
the direction of the signal transmitter. Keep it away from metal
objects.
Resin Band
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.
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.
Receiving the Calibration Signal
There are two methods you can use in order 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.
Hold down the A
A
A
A
A button for
about two seconds.
• The indicator hand will indicate
the result of the reception, the
watch will beep, and the indicator
hand will move to "READY".
READY
To interrupt a receive operation
Press any button.
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, see "Changing the Home City Setting". See the "World Time City Code List" for
information about city codes.
Home City (Supports signal reception)
TYO, HKG
Either the Mt. Otakadoya signal (40 kHz) or the Mt. Hagane signal (60 kHz)
HNL, ANC, LAX, DEN, CHI, NYC
Ft.Collins
• Signal reception is possible in Hong Kong (HKG), Honolulu (HNL), and Anchorage (ANC) when reception conditions are good.
1000km
Transmitter Location
Mt. Otakadoya
500km
(40 kHz)
500km
Mt. Hagane
(60 kHz)
1000km
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, 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.
At the start of the receive
operation
• The indicator hand will move to "READY".
• The hour and minute hands will remain at their normal positions.
• The second hand will stop at "0".
While reception is in progress
• The indicator hand will move to "WORK".
• The hour and minute hands will remain at their normal positions.
• Do not perform any watch operations while signal reception is in
progress.
Y: Successful
N: Unsuccessful
WORK
WORK
When reception is complete (Signaled when the watch beeps.)
• When the receive operation is successful, the indicator hand
moves to "Y", the watch adjusts its time, and then the indicator
hand returns to its second hand operation after about one or two
minutes.
• When the receive operation fails, the indicator hand moves to "N"
and then the watch returns to the unadjusted time after about one
or two minutes.
Receivable Transmitter
Transmitter Location
1000km
3000km
Ft.Collins
3
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