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Operation Guide 3311/3356
3
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 “Selecting Your Home City”. For information about city codes, see the “World Time City
Code List”.
Home City
TYO
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.
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
Transmitter
Internally
Decode
Watch
Time data
Long-wave time
calibration signal
Signal is received
using built-in antenna.
Cesium
atomic clock
Watch decodes
received data and
converts it to time
data.
Time is adjusted
according to time
data.
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.
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 standard wave may be
interrupted occasionally due to maintenance, lightening, etc.
How a Radio-controlled Watch Works
❚
Time Required for Reception
A calibration signal receive operation takes anywhere from about
two to six minutes.
• Note that when “AT” (Auto Select) is specified as the transmitter
selection mode, signal reception can take up to 12 minutes.
• See “Configuring Transmitter Selection Mode Settings” for more
information.
❚
To perform manual receive
In the Timekeeping Mode, hold
down the
DD
DD
D button for about
two seconds.
• The watch will beep and
reception will start. An indicator
flashes on the display and the
receive icon changes to while
signal reception is in progress.
❚
To interrupt reception
Press the
DD
DD
D button.
• All other buttons besides D are disabled during signal reception.
When reception is successful
The watch terminates reception and adjusts the current time. Next it beeps
and then displays the date and time that the adjustment was performed.
•
At this time, the second hand will adjust automatically to the digital time.
• After the date and time of the adjustment appear on the display,
press the D button to return to the Timekeeping Mode. The
watch will also return to the Timekeeping Mode automatically if
you do not perform any operation for about one or two minutes.
Reception Error (ERR Indicator)
The watch does not adjust its current time setting, and displays
“ERR” when signal reception is unsuccessful for some reason.
• The watch will return to the Timekeeping Mode automatically if
you do not perform any operation for about one or two minutes.
❚
Receive Icon
The receive icon cycles from “Unstable”
through “Stable” as shown below while
reception is in progress. How far it cycles
depends on the signal strength. Keep
the watch in a location where reception
is stable while reception is in progress.
Unstable Stable
• Even under optimum reception conditions, it can take about 10
seconds for reception to stabilize.
• Use the receive icon to check reception status and to
determine the best location for signal reception.
• Note that weather, the time of day, surroundings, and other
factors can all affect reception.
❚
Analog Hands and Signal Reception
Second Hand
The second hand moves to the 12 o’clock position when signal
reception starts.
• It resumes normal movement after reception is complete.
• Pressing a button to stop reception causes the second hand to
move to the seconds count as kept by digital timekeeping, and
resume normal operation.
Hour and Minute Hands
These hands continue to operate normally.
Note that the second hand does not move while signal
reception is in progress.
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.
Near high-voltage lines
Among or near buildings
Receiving the Calibration Signal
There are two methods you can use to receive the time calibration
signal.
• Auto receive (Reception is performed automatically at
midnight, 1:00, 2:00, 3:00 and 4:00 each morning.)
•
Manual receive (You initiate reception using a button operation.)
• If reception is not successful for any of the normal auto receive
operations shown above, auto receive is performed one more
time at 5:00 a.m.
• 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.
❚
To position the watch for optimum reception
Remove the watch from your wrist and place it somewhere so its
top (12 o’clock side, where the antenna is located) is facing
approximately in the direction of the signal transmitter. Keep the
watch away from metal objects.
Resin band
Metal band
• Orienting the watch so it is sideways to the transmitter makes it
more difficult to receive the signal.
• Do not move the watch while it is receiving the calibration signal.
Next to a household
appliance or office equipment
(TV, speaker, fax, computer,
cell phone, etc.)
Near mountains
Inside a vehicle
(automobile, train, plane, etc.)
In a location where there is
radio interference
(construction site, airport, etc.)
Receive Icon