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Operation Guide 5640
E-29
x If the current reception fails but a previous
reception (within the last 24 hours) was
successful, RCVD and ERR will be displayed. If
only ERR is displayed (without RCVD), it means
that all of the receive operations over the past
24 hours have failed. The watch will return to the
Timekeeping Mode without changing the time
setting if you press D or if you do not perform
any button operation for more than two minutes.
Note
x To interrupt a receive operation and return to the Timekeeping Mode, press any
button.
If there was a previously
successful reception
Receive failed
E-28
x If the receive operation is successful, the
reception date and time will appear. The watch
will return to the Timekeeping Mode if you press
D or if you do not perform any button operation
for more than two minutes.
RCVD indicator
Receive successful
E-27
x You can use the procedure under “To enable or disable auto receive” (page E-32)
to enable or disable auto receive.
To perform manual receive
In the Timekeeping Mode, hold down D for at least
two seconds.
x A signal level indicator (page E-30) appears after
reception starts. Do not move the watch or perform
any button operation until GET or ERR appears.
Signal level indicator
Receiving
E-26
3. What you should do next depends on whether you are using Auto Receive or
Manual Receive.
x Auto Receive: Leave the watch over night in the location you selected in step 2.
See “Auto Receive” below for details.
x Manual Receive: Perform the operation under “To perform manual receive” on
page E-27.
Auto Receive
x With Auto Receive, the watch performs the receive operation each day
automatically up to six times (up to five times for the Chinese calibration signal)
between the hours of midnight and 5 a.m. (according to the Timekeeping Mode
time). When any receive operation is successful, none of the other receive
operations for that day are performed.
x When a calibration time is reached, the watch will perform the receive operation
only if it is in the Timekeeping Mode or World Time Mode. The receive operation
is not performed if a calibration time is reached while you are configuring settings,
while a countdown timer operation is in progress, or while the hands have been
moved for easier viewing of digital information (page E-73).
E-25
x Signal reception may be difficult or even impossible under the conditions
described below.
Inside or
among
buildings
Inside a
vehicle
Near
household
appliances,
office
equipment,
or a mobile
phone
Near a
construction
site, airport,
or other
sources of
electrical
noise
Near
high-tension
power lines
Among
or behind
mountains
E-24
To get ready for a receive operation
1. Confirm that the watch is in the Timekeeping Mode. If it isn’t, use C to enter the
Timekeeping Mode (page E-36).
2. The antenna of this watch is located on its 12 o’clock side. Position the watch with
12 o’clock facing towards a window as shown in the nearby illustration. Make sure
there are no metal objects nearby.
12 o’clock
or
x Signal reception normally is better
at night.
x The receive operation takes from three
to eight minutes, but in some cases
it can take as long as 16 minutes.
Take care that you do not perform any
button operation or move the watch
during this time.
E-23
x Even when the watch is within range of a transmitter, signal reception may be
impossible due to the effects of geographic contours, structures, weather, the time
of year, the time of day, radio interference, etc. The signal becomes weaker at
distances of approximately 500 kilometers, which means that the influence of the
conditions listed above becomes even greater.
x 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 Anthorn (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)
− Shangqiu (China) transmitter: 500 kilometers (310 miles)
x As of January 2020, China does not use Daylight Saving Time (DST). If China does
go to the Daylight Saving Time system in the future, some functions of this watch
may no longer operate correctly.
E-22
Japanese Signals Chinese Signal
Fukushima
500 kilometers
1,000 kilometers
Fukuoka/Saga
Signals are receivable in the Taiwan area
when reception conditions are good.
1,500 kilometers
Changchun500 kilometers
Beijing
Shangqiu
Shanghai
Chengdu
Hong Kong
E-21
Approximate Reception Ranges
UK and German Signals North American Signal
Anthorn
500 kilometers
1,500 kilometers
Mainflingen
The Anthorn signal is receivable
within this area.
2,000 miles
(3,000 kilometers)
600 miles
(1,000 kilometers)
Fort Collins
E-20
If your Home City Code setting is this:
The watch can receive the signal from the
transmitter located here:
LIS, LON, MAD, PAR, ROM, BER, STO,
ATH, MOW
Anthorn (England), Mainflingen (Germany)
HKG, BJS Shangqiu City (China)
TPE, SEL, TYO Fukushima (Japan), Fukuoka/Saga (Japan)
HNL, ANC, YVR, LAX, YEA, DEN, MEX,
CHI, NYC, YHZ, YYT
Fort Collins, Colorado (United States)
Important!
x The areas covered by MOW, HNL and ANC are quite far from the calibration
signal transmitters, so certain conditions may cause reception problems.
x When HKG or BJS is selected as the Home City, only the time and date are
adjusted according to the time calibration signal. You need to switch manually
between standard time and daylight saving time (DST) if required. See “To
configure Home City settings” (page E-40) for information about how to do this.
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