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Table of contents

1. Facts about JJY
2. The Time Code

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Facts about JJY  
     
 
 
Station:
JJY
Ohtakadoya-yama
JJY
Hagane-yama
Frequency:
40 kHz
60 kHz
Transmitting power:
50 kW
50 kW
Location:
Miyakoji Vil.,
Fukushima Pref.,
Japan
Fuji Vil.
Saga Pref.,
Japan
Receiving area:
1000 km
1000 km
Geographical coordinates:
37° 22' N,
140° 51' E
33° 28' N,
130° 11' E
Time of transmission:
permanent
permanent
Modulation:
100%
100%
 
 
The Time-Code  
     



Modulation
The carrier amplitude is 100% at the beginning of each second and is switched to 10% after 500 ms (binary one) or after 800 ms (binary zero) or after 200 ms for Position-identifier marker (P0...P5) and frame reference marker.

Time-Code Format
The time-code format consists of 1-minute time frames. A time frame contains BCD-coded information of minutes, hours, days, weeks and year. In addition, there are 6 position-identifier markers (P0 thru P5) with reduced carrier amplitude of 800 ms duration.

Please verify this information before commercial use !
http://www.nict.go.jp/overview/index.html