Seiko C-21 - Radio Signal Reception Range: Japan (JJY); Radio Signal Reception Range: China (BPC); Radio Signal Reception Range: U.S.A. (WWVB); Radio Signal Reception Range: Germany

■ Radio signal reception range: Japan (JJY)
The reception range from the transmitting station is approximately 1,000 km (1,000 km radius of the
transmitting station).
Hagane-yama
transmitting
station (60 kHz)
Ohtakadoya-
yama
transmitting
station (40 kHz)
1,000 km
1,000 km
JJY is operated by the National Institute of
Information and Communications Technology
(NICT).
JJY is transmitted from two stations in Japan. Each
station transmits JJY in a different frequency.
Fukushima : Ohtakadoya-yama transmitting
station
Frequency: 40 KHz
Kyushu : Hagane-yama transmitting station
Frequency: 60 KHz
* NICT: National Institute of Information and
Communications Technology
* Even within the reception range, weather conditions,
terrain, buildings, and orientation may mean that
reception is not possible.
“Environments in which it is difficult to receive a radio
signal” → P.25
EN
20
3
HOW TO SET THE TIME (RADIO SIGNAL RECEPTION)
■ Radio signal reception range: China (BPC)
The reception range from the transmitting station is approximately 1,500 km (1,500 km radius of the
transmitting station).
Shangqiu
National Time
Service Center
(68.5 kHz)
1,500 km
BPC is operated by NTSC.
Shangqiu National Time Service Center
Frequency: 68.5 kHz
* NTSC: National Time Service Center
* The watch may be able to receive radio signals outside
a reception range if the receiving conditions are
favorable.
* Even within the reception range, weather conditions,
terrain, buildings, and orientation may mean that
reception is not possible.
“Environments in which it is difficult to receive a radio
signal” → P.25
EN
21
3
HOW TO SET THE TIME (RADIO SIGNAL RECEPTION)
■ Radio signal reception range: U.S.A. (WWVB)
The reception range from the transmitting station is approximately 1,500 km (1,500 km radius of the
transmitting station).
There are four time zones within the reception range.
Fort Collins
transmitting station
Frequency (60 KHz)
1,500 km
WWVB is operated by NIST.
Fort Collins transmitting station
Frequency: 60 kHz
* NIST: National Institute of Standards and Technology
* The watch may be able to receive radio signals outside
a reception range if the receiving conditions are
favorable.
* Even within the reception range, weather conditions,
terrain, buildings, and orientation may mean that
reception is not possible.
“Environments in which it is difficult to receive a radio
signal” → P.25
* Use of automatic reception is recommended, as this
time frame is optimal for automatic reception.
EN
22
3
HOW TO SET THE TIME (RADIO SIGNAL RECEPTION)
■ Radio signal reception range: Germany (DCF77), UK (MSF)
Each reception range from the transmitting station of DCF77 and MSF is approximately 1,000 km and 500 km
(1,000 km and 500 km radius of the each transmitting station). There are four time zones within the reception
range.
Mainflingen
transmitting station
(77.5 kHz)
Anthorn transmitting station
(60.0 kHz)
1,000 km
Approx. 500 km
DCF77 is operated by PTB.
Southeastern Frankfurt
Mainflingen transmitting station (77.5 kHz)
* PTB: Physikalisch-Technische Bundesanstalt
MSF is operated by NPL.
Northern England
Anthorn transmitting station
Frequency: 60.0 kHz
* NPL: National Physical Laboratory
* Even within the reception range, weather conditions,
terrain, buildings, and orientation may mean that
reception is not possible.
“Environments in which it is difficult to receive a radio
signal” → P.25
* Use of automatic reception is recommended, as this
time frame is optimal for automatic reception.
EN
23
3
HOW TO SET THE TIME (RADIO SIGNAL RECEPTION)