Mechanism Of Radio Signal Reception; Automatic Reception And Manual Reception; About Reception Conditions; Radio Signal Reception Range - Seiko 3B51 Instructions Manual

Setting the Time and Date by Receiving a Radio Signal
■ Mechanism of radio signal reception
The radio-controlled watch displays the precise time by automatically receiving and
synchronizing itself with the radio signal of an offi cial standard frequency.
3
Transmitting
Station
Offi cial standard
frequency
Cesium
Atomic Clock
Time signal transmitted by a standard frequency is based on a super accurate "Cesium
Atomic Clock" that may have a 1 second loss or gain per one hundred thousand years.
90
About Reception Conditions
■ Radio Signal Reception Range: In Japan (JJY)
The reception range from each transmitting station is approximately
1,000 km （1,000 km radius of each station） .
3
Ohtakadoya-
yama transmitting
station （40 kHz）
Hagane-yama
transmitting
station （60 kHz）
1,000km
92
Radio-controlled watch
Receive radio signals
through the antenna
inside the watch
↓
Analyze time
information
↓
Display the current
time,
JJY is operated by the National
I n s t i t u t e o f I n f o r m a t i o n a n d
Communications Technology （NICT） .
JJY is transmitted from two stations
in Japan. Each station transmits JJY
in a diff erent frequency.
F u k u s h i m a （ O h t a k a d o y a - y a m a
transmitting station: 40 KHz）
Kyushu （ Hagane-yama transmitting
station: 60 KHz）
1,000km
※ NICT ：National Institute of Information
and Communications Technology
※ W hether the watch succeeds in receiving radio
signals or not depends on the receiving conditions.
Refer to "About reception environment" on page 94.
■ Automatic Reception and Manual Reception
・ Automatic Reception
T his watch sets the time by automatically receiving a radio signal at a fi xed
time. It automatically receives a radio signal at 2:00 AM and 4:00 AM.
※ Once the watch successfully receives a radio signal, automatic reception is terminated.
・Place the watch in a place where it can easily receive a radio signal such as near a window.
・While the watch is receiving radio signals, do not move it.
→ To Improve Radio Signal Reception page 93
・ Manual Reception
In addition to the automatic reception, radio signal reception can be manually conducted as necessary at any time.
→ How to Conduct Manual Reception page 126
※ I f the time zone is set to a region other than Tokyo (Japan), the signal reception function will not work. Make sure that the time zone is set
to Tokyo (Japan). → How to Set the Time Zone page 104
※ R adio signal reception results depend on a receiving condition. → Environments in which it is Diffi cult to Receive a Radio Signal page 94
※ T his watch is unable to receive radio signals outside the reception range → Radio Signal Reception Range Indication page 92
※ W hen the watch is not displaying the precise time even after successfully receiving a radio signal → Troubleshooting: Display of incorrect
time or misalignment of the hands page 138.
■ To Improve Radio Signal Reception
・Place the watch in a place where it can easily receive a radio signal such as near a window.
The antenna is embedded at the 8 o clock position of the watch. Turning the antenna toward the
outside of a window or the direction facing transmitting stations helps improve radio signal reception.
※ Locations of transmitting stations → Radio Signal Reception Range Indication page 92
・Do not move the watch while it is receiving radio signals.
To enhance the reception of radio signals, do not move the watch or do not change
the orientation of the watch while it is receiving radio signals.
※ The reception of the radio signals cannot be conducted unless the watch is still.
Antenna
3
91
3
93