G-Shock GW-002BJ-1 - Manual (Page 3)

Operation Guide 2914
3
❚ To specify the illumination duration
1.
In the Timekeeping Mode,
hold down A
A A A A for about
two seconds.
• This will cause your Home
City code to flash on the
display.
2.
Press the C C C C C button three
times to display the
flashing seconds count.
3.
Press the B B B B B button to
toggle the illumination
duration between about
1.5 seconds ( indicator)
and 2.5 seconds
(
indicator).
4.
After the setting is the way you want, press the A A A A A
button to exit the setting screen.
• The watch will also exit the setting screen automatically if you
do not perform any operation for about two or three minutes.
Home City Code
(3 times) Seconds
What is a radio-controlled watch?
Your radio-controlled watch is designed to receive a time
calibration signal that contains standard time data, and adjust its
current time setting accordingly.
Signal data
Cesium
atomic
clock
Transmitter
Internally
Decode
Watch
Time data
Signal is received
using built-in antenna.
Watch decodes
received data
and converts it
to time data.
Time is adjusted
according to time
data.
Long-
wave time
calibration
signal
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.
How a Radio-controlled Watch Works
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.
• For information about selecting a Home City, see “Configuring Home Time Settings”. For information about city codes, see the “World Time
City Code List”.
Home City
TYO, SEL
LAX, DEN, CHI, NYC
Transmitter
Either the Mt. Otakadoya signal (40kHz) or the Mt. Hagane signal (60kHz)
Fort Collins, Colorado signal
1000km
Mt. Hagane
(60kHz)
Mt. Otakadoya
(40kHz) 500km
1000km
500km
Japan Transmitter
Locations
• 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.
U.S. 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, seasonal conditions, the time of day, can even 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.
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.
Calibration Signal
• The Japanese calibration signal (Call Sign: JJY) is maintained by
the National Institute of Information and Communications
Technology (NICT). It is a long wave signal transmitted 24 hours a
day from the Mt. Otakadoya transmitter (40kHz) located in
Tamura-gun, Fukushima Prefecture, 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.
Note that transmission of the time calibration signal may be
interrupted occasionally due to maintenance, lightning, etc.
Near high-voltage lines Among or near buildings
Near mountains
Inside a vehicle
(automobile, train, plane, etc.)
In a location where there is
radio interference
(construction site, airport, etc.)
Next to a household appliance
or office equipment (TV, speaker,
fax, computer, cell phone, etc.)
Receiving the Calibration Signal
There are two methods you can use to receive the time calibration
signal.
Auto Receive (3 times per day)
When the Home City setting is TYO or SEL , the time calibration
signal is received automatically at 1:00, 2:00, and 3:00 each
morning.
• If both the 2:00 and 3:00 receive operations are unsuccessful, a
receive operation is performed at 4:00. If receive is still
unsuccessful, it is performed again at 5:00.
• If all five of the above receive operations are unsuccessful, a
receive operation is performed again at midnight the following
day.
When the Home City is NYC , CHI , DEN , or LAX , auto receive is
performed at midnight, and at 1:00 and 2:00 in the morning.
• If both the 1:00 and 2:00 receive operations are unsuccessful, a
receive operation is performed at 3:00. If receive is still
unsuccessful, it is performed again at 4:00.
• If all five of the above receive operations are unsuccessful, a
receive operation is performed again at 5:00.
Manual receive (You initiate reception using a button operation.)
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.