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H874 Instruction manual
Note on the time signal
This watch receives time signals from the five signal stations located in four regions
in the world to adjust time, calendar and moon phase indication automatically.
Signal stations
Kind of the
time signal
Receivable distance
A
Fukushima station (Japan)
JJY
Approx. 1500km
B
Kyushu station (Japan) Approx. 2000km
C
Fort Collins station (Denver, United States) WWVB Approx. 3000km
D
Mainflingen station (Germany) DCF77 Approx. 1500km
E
Shangqiu station (Henan, China) BPC Approx. 1500km
• The distance of receivable range is only used as an approximate value. The
receivable range is often affected by the following conditions: receiving
environment, time, weather, (lightning), and so on.
A
B
C
D E
About signal reception
Types of signal reception
There are three ways to receive the time signal.
Type Use
Automatic reception The watch receives time signals once a day automatically.
Manual reception (On
demand reception)
You can perform signal reception manually when
required.
Recovery automatic
reception
The watch automatically receives time signals when it
is charged enough after it stopped due to insufficient
charge.
• Even when this watch receives the signal successfully, the accuracy of the displayed
time will be dependent on the reception environment and internal processing.
• This watch keeps ±15-second monthly accuracy even if no time signal is received.
When receiving the time signal
Take off the watch with pushing the crown in to position
0
and place it on a stable
surface where it can receive the signal better, such as next to a window.
• When wire glass is used for the window, open it or
change the reception place.
• The reception antenna is located at the 9:00 position
of the watch. Place the watch with the 9:00 position
facing toward the station.
• Do not move the watch during time signal reception.
• When the second hand is moving once every two
seconds (during insufficient charge warning), time
signal reception is not executed. Charge the watch
before trying reception.
Poor reception areas
It may be difficult to receive the time signal properly under certain environmental
conditions or in areas susceptible to radio noise.
• Extremely hot or cold locations
• Inside vehicles
• Electrical appliances and OA equipment
• Near high-voltage electric cables, railway overhead cables, airports (transmission
facilities)
• Inside reinforced concrete buildings, between tall buildings, mountains, or
underground
• Near mobile phones or smartphones that are in use
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