— 4 —
T
o
specify the illumination duration
1.
In the T
imekeeping Mode,
hold down the
AAAAA
button
for about two seconds.
•
This will cause your city code
to flash on the display
.
2.
Press the
CCCCC
button three
times to display the
flashing seconds count.
3.
Press the
BBBBB
button to
toggle the illumination
duration between about
1.5 seconds (
indicator)
and 3 seconds
(
indicator).
4.
After the setting is the way you want, press the
AAAAA
button to exit the setting screen.
•
The watch will also exit the setting screen automatically if you
do not perform any operation for about two or three minutes.
City Code
(3 times)
Seconds
What is a radio-controlled watch?
Y
our 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
Cesium
atomic
clock
Tr
ansmitter
Internally
Decode
W
atch
T
ime data
Signal is received
using built-in antenna.
W
a
tch decodes
received data
and converts it
to time data.
T
ime is adjusted
according to time
data.
Long-
wave time
calibration
signal
After the watch receives the Standard
T
ime 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
T
echnology (NICT). It is a long wave signal transmitted 24 hours a
day from the Mt. Otakadoya transmitter (40kHz) located in
T
a
mura-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
Location
Reception is dif
ficult and may even be impossible in the locations
described below
.
A
v
oid such locations when performing signal
reception.
•
Y
ou 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 (Y
ou 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.
■
T
o
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 dif
ficult to receive the signal.
•
Do not move the watch while it is receiving the calibration signal.
Near mountains
Inside a vehicle
(automobile, train, plane, etc.)
In a location where there is
radio interference
(c
onstruction site, airport, etc.)
Next to a household appliance or
of
fice equipment (TV
, speaker
,
fax, computer
, cell phone, etc.)
Reception Range
This watch is designed to receive the standard time calibration signal of Japan (JJY) or of the United States (WWVB).
The signa
l that is
received depends on the current Home City setting.
•
For information about selecting a Home City
, see
“Configuring Home
T
ime Settings
”. For information about city codes, see the
“W
orld T
ime
City Code List
”.
Home City
TYO
LAX, DEN, CHI, NYC
T
ransmitter
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 T
ransmitter
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. T
ransmitter
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 a
re within
range of the transmitter
.
•
Best reception is possible late at night.