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Mode Reference Guide; Signal Level Indicator - Casio 3445 Operation Manual

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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
infl uence of the conditions listed above becomes even greater.
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.
Mainfl ingen (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)
As of January 2016, 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.
To get ready for a receive operation
1. Confi rm that the watch is in the Timekeeping Mode or World Time Mode. If it isn't, use C to enter the
Timekeeping Mode or World Time Mode (page E-26).
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
You can use the procedure under "To turn auto receive on or off" (page E-21) to enable or disable auto
To perform manual receive
1. Use C to select the Receive Mode (R/C) as shown on page E-26.
One second after R/C appears on the display, the text RECEIVED
Receive indicator
will scroll across the upper display.
2. Hold down D until RC Hold appears on the display and then
A signal level indicator (L1, L2, or L3, see page E-20) will appear
on the display after reception starts. Do not allow the watch to
move and do not perform any button operation until GET or ERR
appears on the display.
If the receive operation is successful, the reception date and time
appear on the display, along with the GET indicator.
The watch will return to the Timekeeping Mode if you press any
button or if you do not perform any button operation for about two
Receive successful
or three minutes.

Signal Level Indicator

During manual receive, the signal level indicator displays the signal level
as shown below.
Weak (Unstable)
The level indication will change in accordance with reception conditions
while reception is being performed.
As you watch the signal level indicator, keep the watch in a location that
best maintains stable reception.
Even under optimum reception conditions, it can take about 10
seconds for reception to stabilize.
Note that weather, the time of day, surroundings, and other factors all
can affect reception.
Radio-controlled Atomic Timekeeping Precautions
Strong electrostatic charge can result in the wrong time setting.
Even if a receive operation is successful, certain conditions can cause the time setting to be off by up
to one second.
The watch is designed to update the date and day of the week automatically for the period January 1,
2000 to December 31, 2099. Updating of the date by signal reception will no longer be performed
starting from January 1, 2100.
If you are in an area where signal reception is not possible, the watch keeps time with the precision
noted in "Specifi cations".
The receive operation is disabled under any of the following conditions.
– While the charge level is low (3 or lower) (page E-10), or while the watch is in the power recovery mode
(page E-11)
– When the watch is in the function sleep state ("Power Saving", page E-13)
– While the watch is in the Diving Mode
– While a water depth measurement, direction, or temperature reading operation is in progress
– While a countdown timer operation is in progress (page E-84)
A receive operation is cancelled if an alarm sounds while it is being performed.
The Home City setting reverts to the initial default of TYO (Tokyo) whenever the battery power level
drops to Level 5 or when you have the rechargeable battery replaced. If this happens, change the
Home City to the setting you want (page E-30) .
Operation Guide 3445
Signal reception normally is better at night.
The receive operation takes from two to ten minutes, but
in some cases it can take as long as 20 minutes. Take
care that you do not perform any button operation or
move the watch during this time.
Strong (Stable)
Signal reception may be diffi cult or even impossible under the conditions described below.
Inside or
Inside a
offi ce
or a mobile
3. What you should do next depends on whether you are using auto receive or manual receive.
Auto receive: Leave the watch over night in the location you selected in step 2. See "Auto Receive"
below for details.
Manual receive: Perform the operation under "To perform manual receive" on page E-18.
Auto Receive
With auto receive, the watch performs the receive operation each day automatically up to six times (up
to fi ve 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.
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 confi guring settings.
If the current reception fails but a previous reception (within the
Receive failed
last 24 hours) was successful, the display shows the receive
indicator and the ERR indicator. If the ERR indicator only is
displayed (without the receive indicator), 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 any button or if you do not perform any
button operation for about two or three minutes.
You can interrupt a time calibration signal reception operation by
pressing any button.
To check the latest signal reception results
Enter the Receive Mode (page E-26).
When receive is successful, the display shows the time and date that
receive was successful. - : - -, - - - - indicates that none of the
reception operations were successful.
To return to the Timekeeping Mode, press C.
To turn auto receive on or off
1. Enter the Receive Mode (page E-26).
2. Hold down A for at least two seconds. First, SET Hold will appear on
display. After that, AUTO will appear in the upper display and the
current auto receive setting (On or OFF) will appear in the lower
display. Keep A depressed until the AUTO screen appears. This is
the setting screen.
Note that the setting screen will not appear if the currently selected
Home City is one that does not support time calibration reception.
3. Press D to toggle auto receive between on (On) and off (OFF).
On/Off status
4. Press A to exit the setting screen.
A successful receive operation is indicated by a G in the center
of the graphic dial. Even if a receive operation fails, a G will be
displayed in the center of the graphic dial if a previous receive
operation within the past 24 hours was successful.

Mode Reference Guide

Your watch has 12 "modes". The mode you should select depends on what you want to do.
To do this:
View the current date in the Home City
Confi gure Home City and daylight saving time (DST) settings
Confi gure time and date settings manually
Take dive time, water depth, compass, or water temperature readings
Determine your current bearing or the direction from your current
location to a destination
Recall dive start time, dive time, maximum depth, low water temperature
Recall time stamp records created in the Timekeeping Mode or in the
measurement modes
Use the stopwatch to measure elapsed time
Use the countdown timer
Set an alarm time
View the current time in one of 48 cities (31 time zones) +UTC around
the globe
Display the temperature at your current location
Measure temperature
View tide levels (Tide Graph), the Moon shape (Moon phase) and Moon
age for a specifi ed date
Near a
Among or
site, airport
power lines
Enter this mode:
Timekeeping Mode
Diving Mode
Digital Compass Mode
Diving Log Mode
Time Recall Mode
Stopwatch Mode
Countdown Timer Mode
Alarm Mode
World Time Mode
Thermometer Mode
Tide/Moon Mode


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