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Operation Guide 2628
2
• Signal reception normally is better at night than during the day.
• Time calibration signal reception takes from two to six minutes. Take care that you
do not perform any button operations or move the watch during this time.
Reception Range
2,000 miles
Fort Collins
600 miles
• At distances further than about 600 miles (1,000 kilometers) from the transmitter,
signal reception may not be possible during certain times of year or times of day.
Radio interferance may also cause problems with reception.
• Even when the watch is within the reception range of the transmitter, signal
reception is impossible if the signal is blocked by mountains or other geological
formations between the watch and signal source.
• Signal reception is affected by weather, atmospheric conditions, and seasonal changes.
• See the information under “Signal Receive Troubleshooting” if you experience
problems with time calibration signal reception.
About Auto Receive
When auto receive is turned on, the watch starts to receive the time calibration signal
automatically when the time in the Timekeeping Mode reaches midnight, 1:00 a.m.,
2:00 a.m., 3:00 a.m., and 4:00 a.m. each day (calibration times). The watch will also
perform an additional auto receive at 5:00 a.m. if none of the regularly scheduled auto
receives are successful.
Note
• The auto receive operation is performed only if the watch is in the Timekeeping
Mode or World Time Mode when one of the calibration times is reached. It is not
performed if a calibration time is reached while an alarm is sounding, or while you
are configuring settings (while settings are flashing on the display).
• Auto receive of the calibration signal is designed to be performed early in the
morning, while you sleep (provided that the Timekeeping Mode time is set correctly).
Before going to bed for the night, remove the watch from your wrist, and put it in a
location where it can receive the signal easily.
• When auto receive is turned on, the watch receives the calibration signal for two to
six minutes everyday when the Timekeeping Mode time reaches each of the
calibration times. Avoid performing any button operation within six minutes before or
after any one of the calibration times. Doing so can interfere with correct calibration.
• Remember that reception of the calibration signal depends on the time kept in the
Timekeeping Mode. The receive operation will be performed whenever the display
shows any one of the calibration times, regardless of whether or not the
Timekeeping Mode time actually is the correct time.
• When two, three, or four receptions are successful, the watch uses the data of the
last reception for calibration. When only one reception is successful, the watch uses
the data of the successful reception.
About the Receiving Indicator
The receiving indicator shows the strength of the calibration signal being received. For
best reception, be sure to keep the watch in a location where signal strength is
strongest.
Receiving indicator
Weak
Strong
(Level 1)
(Level 4)
• Use the receiving indicator as a guide for checking signal strength and for finding the
best location for the watch during signal receive operations.
• Even in an area where signal strength is strong, it takes about 10 seconds for signal
reception to stabilize enough for the receiving indicator to indicate signal strength.
• Following reception of the time calibration signal and calibration of the watch’s time
setting, the Level 4 receiving indicator will remain on the display in all modes. The
Level 4 receiving indicator will not be displayed if signal reception was unsuccessful
or after you adjust the current time setting manually.
• The Level 4 receiving indicator is displayed only when the watch is able to receive
both time and date data successfully. It does not appear when only time data is
received.
• The Level 4 receiving indicator indicates that at least one of the auto calibration
signal receive operations was successful. Note, however, that the Level 4 receiving
indicator is cleared from the display at 3:00 a.m. each day.
To perform manual receive
1.Place the watch on a stable surface so its top (12
o’clock side) is facing towards a window.
2.In the Timekeeping Mode, hold down D for about two
seconds until the watch beeps.
• Release D and the message
RC! appears to indicate
that signal reception has started.
• Time calibration signal reception takes from two to six
minutes. Take care that you do not perform any button
operations or move the watch during this time.
• After signal reception is complete, the display of the
watch changes to the Last Signal screen.
Note
• To interrupt a receive operation and return to the Timekeeping Mode, press D.
• If the receive operation is unsuccessful, the message
ERR appears on the display
for about one or two minutes. After that, the watch returns to the Timekeeping Mode.
• You can also change from the Last Signal or
ERR screen to the normal
timekeeping screen by pressing D.
Receiving indicator
To turn auto receive on and off
1.In the Timekeeping Mode, hold down A until the city
code starts to flash, which indicates the setting screen.
2.Press C twice to move the flashing to the auto receive
on/off setting.
3.Press D to toggle auto receive on (ON) and off (OFF).
• If the current Home City setting is a city code that
does not support signal receive, “xx” appears in
place of the on/off indicator. This means you cannot
turn auto receive on or off.
4.Press A twice to exit the setting screen.
• For information about city codes that support signal
receive, see “To set your Home City”.
On/off status
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To display the Last Signal screen
In the Timekeeping Mode, press D to display the Last Signal screen (indicated by
GET). The Last Signal screen shows the date and time of the last successful time
calibration signal reception.
• If you do not press D to return from the last signal screen to the timekeeping
screen, the watch will return automatically after about two or three minutes.
Last Signal Screen
▲
Press D.
Day of week
Receive time
Month – DayHour : Minutes Seconds
PM
indicator
▲
Receive date
Timekeeping Screen
Signal Receive Troubleshooting
Check the following points whenever you experience problems with calibration signal
reception.
Problem
Cannot perform
manual receive.
Auto receive is
turned on, but
the Level 4
receiving
indicator does
not appear on
the display.
Time setting is
incorrect
following signal
reception.
Probable Cause
•
The watch is not in the Timekeeping Mode.
• Your current Home City is not one of the
following city codes:
LAX, DEN, CHI, or NYC.
• You changed the time setting manually.
• The watch was not in the Timekeeping
or World Time Mode, or you performed
some button operation during the auto
receive operation.
•
Even if receive is successful, the Level 4
receiving indicator disappears every day
at 3 am.
• Time data (hour, minutes, seconds) only
was received during the last receive
operation. The Level 4 receiving
indicator appears only when time data
and date data (year, month, day) are
both received.
• If the time is one hour off, the DST
setting may be incorrect.
• The Home City code setting is not
correct for the area where you are using
the watch.
What you should do
• Enter the Timekeeping Mode
and try again.
• Select LAX, DEN, CHI, or
NYC as your Home City.
• Perform manual signal receive
or wait until the next auto
signal receive operation is
performed.
• Check to make sure the
watch is in a location where it
can receive the signal.
• Change the DST setting to
Auto DST.
• Select the correct Home City
code.
• For further information, see “Important!” under “Time Calibration Signal Reception”
and “Radio-controlled Atomic Timekeeping Precautions”.
Sunrise/Sunset Mode
You can use the Sunrise/Sunset Mode to display the
sunrise and sunset times for a particular date (year,
month, day) specified by you.
• Before trying to use the Sunrise/Sunset Mode, you need
to configure settings for the city code, longitude, latitude,
and GMT differential for the location whose sunrise and
sunset times you want to view.
• The factory default configuration of the location is:
Latitude: North 35 degrees; Longitude: East 140
degrees; GMT Differential: +9 hours.
• You can find latitude, longitude, and GMT differential for
various cities around the globe in the “Site Data List”.
• The sunrise and sunset information that initially appears
when you enter the Sunrise/Sunset Mode is that for the
current date as kept in the Timekeeping Mode.
Sunset time
Sunrise/
Sunset graph
Sunrise time
• All of the operations in this section are performed in the Sunrise/Sunset Mode,
which you enter by pressing C.
To specify a city code to check its sunrise and sunset times
1. Enter the Timekeeping Mode.
2. Hold down A until the current city code setting starts to flash. This is the setting
screen.
3. Use D (Eastward) and B (Westward) to select the city code whose sunrise and
sunset times you want to view.
• For details about city codes, see the “City Code Table”.
4. Press A twice to exit the setting screen.
To configure longitude, latitude and GMT differential settings
1.Enter the Sunrise/Sunset Mode.
2.Hold down A to cycle through the screens until the
longitude/latitude setting screen appears.
3.Use B to set the longitude and D to set the latitude.
• Pressing the buttons will change the longitude and
latitude values as shown below.
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Longitude/Latitude
Setting Screen
▲
▲
Longitude
Latitude
Press this button:
B
D
To cycle the value in this sequence:
179°W to 1°W, 0°E to 180°E
65°S to 1°S, 0°N to 65°N
Press C.
4.Press C to display the GMT differential setting screen.
5.Use D (+) and B (–) to change the GMT differential in
0.5 hour increments.
6.Press A to exit the setting screen.
• This will cause the display to show the date (year,
month, and day), followed by the sunrise and sunset
time for that date.
GMT Differential
Setting Screen