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Operation Guide 4766
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 receives the time calibration signal automatically up to six
times a day. When any auto receive is successful, the remaining auto receive
operations are not performed. For more information, see "About Auto Receive".
• Manual Receive
Manual receive lets you start a time calibration receive operation 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.
Make sure there are no metal objects nearby.
• 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 normally is better at night than during the day.
• Time calibration signal reception takes from two to seven minutes, but in some
cases it can take as long as 14 minutes. Take care that you do not perform any
button operations or move the watch during this time.
• The time calibration signal the watch will attempt to pick up depends on its current
Home City code setting as shown below. If you use the watch in Japan or Europe
(each of which has two different transmitter locations), it will try to receive the time
calibration signal from one of the transmitters in your current location. If it cannot
receive the signal, it will then try to receive the time calibration signal from the other
transmitter.
Home City Codes and Transmitters
Home City Code
Transmitter
Rugby (England)
LON, PAR, ATH
Mainflingen (Germany)
Fukushima (Japan)
HKG*, TYO
Fukuoka/Saga (Japan)
HNL*, ANC*, LAX,
Fort Collins, Colorado
DEN, CHI, NYC
(the United States)
*
The areas covered by the HKG, HNL, and ANC city codes are quite far from the
time calibration signal transmitters, and so certain conditions may cause problems
with signal reception.
Reception Ranges
U.K. and German Signals
1,500 kilometers
Mainflingen
Rugby
500 kilometers
500 kilometers
Fukuoka/Saga
1,000 kilometers
Japan Signal
• Signal reception may not be possible at the distances noted below during certain
times of the year or day. Radio interference may also cause problems with reception.
Mainflingen (Germany) or Rugby (England) transmitters: 500 kilometers (310
miles)
Fort Collins (United States) transmitter: 600 miles (1,000 kilometers)
Fukushima or Fukuoka/Saga (Japan) transmitters: 500 kilometers (310 miles)
• 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.
About Auto Receive
The watch receives the time calibration signal automatically up to six times a day.
When any auto receive is successful, the remaining auto receive operations are not
performed. The reception schedule (calibration times) depends on your currently
selected Home City, and whether standard time or Daylight Saving Time is selected
for your Home City.
12 o'clock
or
Near a
Near high-
Among or
construction
tension
behind
mountains
site, airport, or
power lines
other sources
of electrical
noise
Frequency
60.0 kHz
77.5 kHz
40.0 kHz
60.0 kHz
60.0 kHz
U.S. Signal
2,000 miles
(3,000 kilometers)
600 miles
(1,000 kilometers)
Fort Collins
500 kilometers
Fukushima
1,000 kilometers
Your Home City
Auto Receive Start Times
1
LON
Standard Time
1:00 am
Daylight
2:00 am
Saving Time
PAR
Standard Time
2:00 am
Daylight
3:00 am
Saving Time
ATH
Standard Time
3:00 am
Daylight
4:00 am
Saving Time
HKG, TYO
Standard Time
Midnight
HNL, ANC, LAX,
Standard Time
DEN, CHI, NYC
Midnight
Daylight
Saving Time
Note
• Auto receive is supported in all modes except while a stopwatch elapsed time
operation is in progress.
• 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 receive the signal easily.
• The watch receives the calibration signal for two to 14 minutes everyday when the
time in the Timekeeping Mode reaches each of the calibration times. Do not perform
any button operation within 14 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 current time in the
Timekeeping Mode.
To perform manual receive
1. Place the watch on a stable surface so its 12 o'clock
side is facing towards a window.
2. In the Timekeeping Mode, hold down A for about two
seconds.
3. The stopwatch second hand will move to R (READY) to
indicate that the watch is setting up for time calibration
reception.
• The stopwatch second hand will move to W (WORK)
and stay there while actual reception is in progress.
R(READY)
• The hour, minute, and 24-hour hands all continue to
W(WORK)
keep time normally.
Y(YES)
• The second hand will stop at "0".
*
Some models show "60" instead of "0".
• Time calibration signal reception takes from two to
seven minutes, but in some cases it can take up to 14
minutes. Take care that you do not perform any button
operations or move the watch during this time.
N(NO)
• After signal reception is successful, the watch adjusts its hour, minute, 24-hour
hand, and second hand settings, and then returns to the Timekeeping Mode. Next,
the stopwatch second hand moves to Y (YES) momentarily to indicate that signal
reception was successful. After about five seconds, the stopwatch second hand
moves to 12 o'clock.
Note
• To interrupt a receive operation and return to the Timekeeping Mode, press any
button.
• If signal reception fails for some reason, the watch returns to normal timekeeping
without making any adjustments. Next, the stopwatch second hand moves to N (NO)
momentarily to indicate that signal reception failed. After about five seconds, the
stopwatch second hand moves to 12 o'clock.
• If the stopwatch second hand is pointing to Y (YES) or N (NO), you can return to the
Timekeeping Mode by pressing any button.
Viewing the Latest Signal Reception Results
You can use the procedure below to check whether or not the last signal receive
operation was successful.
To check the latest signal reception results
In the Timekeeping Mode, press A.
• If the watch was able to perform a successful signal
receive operation during the last receive period, the
stopwatch second hand will move to Y (YES).
If the watch has been unable to receive any signal
successfully, the stopwatch second hand will move to
N (NO).
• The watch will return to the Timekeeping Mode after five
seconds or when you press A.
• The current receive result is cleared when the first auto receive operation is
performed on the following day. This means Y (YES) indicates successful signal
reception since the start of the current day.
• If you adjust the time or date setting manually, the stopwatch second hand will move
to N (NO).
Signal Reception Troubleshooting
Check the following points whenever you experience problems with signal reception.
Problem
Probable Cause
• You changed the time setting
The
stopwatch
manually.
• You performed some button operation
second hand
is pointing at
during the auto receive operation.
• The stopwatch is performing an
N (NO).
elapsed time measurement operation.
• Signal reception results are reset at
the first time of the next receive
period.
• The Home City setting is not correct
Time setting
is incorrect
for the area where you are using
following
the watch.
• The home position of the hands is off.
signal
reception.
• For further information, see "Important!" under "Time Calibration Signal Reception"
and "Radio-controlled Atomic Timekeeping Precautions".
2
3
4
5
6
2:00 am
3:00 am
4:00 am
5:00 am
Midnight
next day
3:00 am
4:00 am
5:00 am
Midnight
1:00 am
next day
next day
3:00 am
4:00 am
5:00 am
Midnight
1:00 am
next day
next day
4:00 am
5:00 am
Midnight
1:00 am
2:00 am
next day
next day
next day
4:00 am
5:00 am
Midnight
1:00 am
2:00 am
next day
next day
next day
5:00 am
Midnight
1:00 am
2:00 am
3:00 am
next day
next day
next day
next day
1:00 am
2:00 am
3:00 am
4:00 am
5:00 am
1:00 am
2:00 am
3:00 am
4:00 am
5:00 am
*
What you should do
• Perform manual signal
receive or wait until the next
auto signal receive operation
is performed.
• Stop the stopwatch operation.
• Check to make sure the watch
is in a location where it can
receive the signal.
• Select the correct Home City.
• Enter the Home Position
Adjustment Mode and adjust
the home position.
2
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