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Operation Guide 4782 (OC)
3
The Power Saving feature of the watch is turned on at the factory.
• Power Saving causes the watch to enter a sleep state
automatically in order to save power whenever it is left in the dark.
• Note that the watch also may enter the sleep state if the watch is
blocked from light by your sleeve.
How power saving works
Display sleep state
The display sleep state is triggered whenever the watch is left in the
dark for three or four days.
• In the display sleep state, the display is blank, but alarms, the
hourly time signal, digital-analog time coordination, and auto
signal receive all continue to operate normally.
Power Saving How a Radio-controlled Watch Works
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.
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.
Cesium
atomic clock
Transmitter
Long-wave time
calibration signal
Watch
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.
1000km
Mt. Hagane
(60 kHz)
Mt. Otakadoya
(40 kHz)
500km
1000km
500km
Transmitter Location
Japan (JJY)
United States (WWVB)
3000km
1000km
Fort Collins
• 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.
• 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.
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
“Configuring Home City Settings”. See the “World Time City
Code List” for more information about city codes.
Home City
Fort Collins, Colorado signal
Receivable Transmitter
HNL, ANC, LAX, DEN,
CHI, NYC
HKG, TYO, SEL
Either the Mt. Otakadoya signal
(40 kHz) or the Mt. Hagane signal
(60 kHz)
• Geographic contours, nearby buildings, the season, the time of
day, can even make reception impossible even when you are
within range of the transmitter.
• Signal reception also is possible in Hong Kong (HKG), Honolulu
(HNL), and Anchorage (ANC) when reception conditions are
good.
• Best reception is possible late at night.
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.)
Manual receive(You initiate reception using a button operation.)
• Any time a signal receive operation is successful, no more auto
receive operations are performed that day.
• The watch is set up for auto receive at the factory, so all you need to
do is to place it in a location that allows good reception each night.
❚
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.
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 as operating like a radio or TV
when it is receiving the calibration signal.
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.
Near high-voltage linesAmong or near buildings
Next to a household
appliance or office
equipment (TV, speaker, fax,
computer, cell phone, etc.)
Near mountains
Inside a vehicle
(automobile, train, plane, etc.)
In a location where there is
radio interference (construction
site, airport, etc.)
Function sleep state
The function sleep state is triggered whenever the watch is left in the
dark for four days.
• In the function sleep state, alarms, the hourly time signal, analog
timekeeping, and auto signal receive are disabled.
• Digital timekeeping functions continue to operate normally.
Display Sleep State
❚
To recover from the sleep state
Move the watch to a brightly lit location or press any button.
• It can take up to two seconds before display figures re-appear
after you place the watch in a well-lit area.
❚
To turn Power Saving on and off
See the procedure under “To configure Home City settings” for
information about turning off Power Saving.
Leaving the watch in a drawer or anywhere else it is dark can
cause Power Saving to trigger in order to conserve battery
power.