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Operation Guide 3311 5052
Time Calibration Signal Reception
There are two different methods you can use to receive the time calibration signal:
auto receive and manual receive.
• Auto Receive
With auto receive, the watch automatically picks up the time calibration signal five
times a day at 0:00 a.m., 1:00 a.m., 2:00 a.m., 3:00 a.m., and 4:00 a.m. For more
information, see "About Auto Receive".
• Manual Receive
Manual receive lets you start time calibration signal reception with the press of a
button. For more information, see "To perform manual receive".
Important!
• When getting ready to receive the time calibration signal, position the watch as
shown in the nearby illustration, with its 12 o'clock side facing towards a window.
This watch is designed to receive a time calibration signal late at night. Because of
this, you should place the watch near a window as shown in the illustration when you
take it off at night. Make sure there are no metal objects nearby.
Resin Band
Metal Band
• Make sure the watch is facing the right way.
• Proper signal reception can be difficult or even impossible under the conditions listed
below.
Inside or
Inside a
Near
among
vehicle
household
buildings
appliances,
office
equipment,
or a mobile
phone
• Signal reception is normally better at night than during the day.
• Time calibration signal reception takes from two to seven minutes. Take care that
you do not perform any button operations or move the watch during this time.
• When within range of the applicable transmitter, this watch can receive either the
U.S. (Fort Collins, Colorado) or Japanese (Fukushima or Fukuoka/Saga) time
calibration signal. The signal the watch will attempt to pick up depends on its current
Home City code setting as shown below.
Home City Code
*
*
HNL
,
ANC
,
LAX
,
DEN
,
Fort Collins, Colorado
,
CHI
NYC
**
*
*
TYO
,
SEL
,
HKG
The areas covered by the
SEL
,
HKG
*
are quite far from the time calibration signal transmitters, and so
certain conditions may cause problems with signal reception.
With
, you can specify either 40kHz or 60kHz.
**
TYO
500
2,000 miles
600 miles
kilometers
Fukuoka/Saga
1,000
kilometers
Fort Collins
• Under good reception conditions, signal reception is possible within a radius of
about 2,000 miles (3,000 kilometers) from the Fort Collins transmitter.
• At distances further than about 600 miles (1,000 kilometers) from the Fort Collins
transmitter, signal reception may not be possible during certain times of year or
times of day. Radio interferance may also cause problems with reception.
• At distances further than about 500 kilometers from the Fukushima and Fukuoka/
Saga 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 will be 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 Reception Troubleshooting" if you experience
problems with time calibration signal reception.
About Auto Receive
When auto receive is turned on, the watch automatically starts to receive the time
calibration signal when the time in the Timekeeping Mode reaches 0:00 a.m., 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 receive are successful.
Note
• Auto receive 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).
• When a reception starts, the second hand will move at high speed to the 12 o'clock
position where it will stop until the reception is complete.
• Auto receipt 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 easily receive the signal.
Near a
Near high-
Among or
construction
tension
behind
site, airport, or
power lines
mountains
other sources
of electrical
noise
Transmitter
Frequency
60kHz
Fukushima
40kHz
Fukuoka/Saga
60kHz
,
HNL
, and
ANC
city codes
500
kilometers
Fukushima
1,000
kilometers
• When auto receive is turned on, the watch receives the calibration signal for two to
seven minutes everyday when the time in the Timekeeping Mode reaches each of
the five calibration times. Do not perform any button operation within seven minutes
before or after any of the five calibration times. Doing so can interfere with correct
calibration.
• Remember that reception of the calibration signal depends on the time kept in the
digital display. The reception will be performed whenever the display shows one of
the five calibration times, regardless of whether or not the displayed time is actually
the correct time.
• When two, three, four, or five 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
(Level 1)
• 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.
• Use the receiving indicator as a guide for checking signal strength and for finding the
best location for the watch during signal reception.
• The Level 4 receiving indicator appears on the Timekeeping Mode's Receiving
Indicator and Seconds Count screen only.
The Level 4 receiving indicator is not displayed if signal reception was unsuccessful
or after manual adjustment of the current time setting.
• The Level 4 receiving indicator indicates that at least one of the five calibration
signal reception 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.
Receiving indicator
2. In the Timekeeping Mode, hold down D for about two
seconds until the watch beeps.
3. Release D and RC flashes to indicate that signal
reception has started.
• When a reception starts, the second hand will move at
high speed to the 12 o'clock position where it will stop
until the reception is complete.
• Time calibration signal reception normally takes from two to seven minutes. In
Japan, however, reception can take up to 14 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 reception and return to the Timekeeping Mode, press D.
• If the reception is unsuccessful, the message
one or two minutes. After that, the watch returns to the Timekeeping Mode.
• You can also change from the last signal or
screen by pressing D.
To turn auto receive on and off
1. In the Timekeeping Mode, hold down A until the
transmitter indicator starts to flash, which indicates the
setting screen.
On/off status
• The second hand will move at high speed to the 12
o'clock position, where it will stop.
2. Press C three times to move the flashing to the auto
receive on/off setting.
3. Press D to toggle auto receive on (
• If the current Home City setting is a city code that
does not support auto receive, " -- " 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.
• The second hand will advance at high speed to the correct position in accordance
with the digital time seconds count, and resume normal movement from there.
• For information about city codes that support signal reception, see "To set your
Home City".
Signal Reception Troubleshooting
Check the following points whenever you experience problems with signal reception.
Problem
Probable Cause
• The watch is not in the Timekeeping
Cannot perform
manual receive.
Mode.
• Your current Home City is not one of the
following city codes:
HNL
,
LAX
,
DEN
,
CHI
,
NYC
SEL
, or
TYO.
• You changed the time setting manually.
Auto receive is
• The watch was not in the Timekeeping
turned on, but
the Level 4
or World Time Mode, or you were
receiving
performing some button operation
indicator does
during the auto receive.
• Even if reception is successful, the
not appear on
the Timekeeping
Level 4 receiving indicator disappears
Mode display.
every day at 3 a.m.
• Time data (hour, minutes, seconds) only
was received during the last reception.
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
Time setting is
incorrect
setting may be incorrect.
• The Home City code setting is not
following signal
reception.
correct for the area where you are using
the watch.
• For further information, see "Important!" under "Time Calibration Signal Reception"
and "Radio-controlled Atomic Timekeeping Precautions".
Strong
(Level 4)
ERR
appears on the display for about
ERR
screen to the normal timekeeping
) and off (
).
ON
OF
What you should do
• Enter the Timekeeping Mode
and try again.
• Select
HNL
,
ANC
,
LAX
,
ANC
,
DEN
,
CHI
,
NYC
,
HKG
,
,
HKG
,
SEL
, or
TYO
as your Home
City.
• Perform manual receive or
wait until the next auto
receive 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.
2
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