One of two radio transmission stations for radio clocks is stopping, the clock adjustment function by radio waves stops mainly in Tohoku and Hokkaido

Automatically correct error by receiving standard time signalRadio clockHowever, among the two radio transmission stations transmitting the standard radio wave, it became clear that the Otakadaya mountain standard radio transmission station (40 kHz) is stopping.

As a result, the clock adjustment function is effectively stopped in the area where time correction is done only with the radio wave of Otakadaya mountain standard radio wave transmission station, mainly in Tohoku and Hokkaido.

Details are as below.
Japan Standard Time (JST) Project
http://jjy.nict.go.jp/


Announcements are as follows.

Otakadaya mountain standard radio transmission station (40 kHz) is stopping
According to the evacuation order accompanying Fukushima nuclear power plant at 19:46 on March 12, the otakadaya transmission station got a stop wave action.
The likelihood of recovery is undecided.
We apologize to everyone for your inconvenience, but thank you for your understanding.

Transmission station aerial


Antenna Landscape


Transmission station building


Time signal management room


Transmitter


※ All the above photos are provided by the National Institute of Information and Communications Technology

In addition, the detailed data of the Otakadaya mountain standard radio transmission site is posted below.

Longwave Standard Radio Facility Otakadoya Standard Radio Transmission Station
http://jjy.nict.go.jp/LFstation/otakado/index.html


It is like this as to how much influence it has.


In addition, the following materials are helpful.

Electric field intensity prediction map


Winter electric field intensity prediction map


In addition, this is not the first time to stop, actually it is stopped due to maintenance etc. from time to time, you can see that the temporary stoppage even in this earthquake looks at the following information page.

JJY TX Log

At the Odakadoyama standard radio transmission station, earthquakes and
To avoid earthquake damage stops at the following date (Japan time)
Did.

Friday, March 11, 2011 14: 48: 31 ~ 14: 48: 32
Friday, March 11, 2011 14: 48: 35 to 16: 40: 12

Uses standard radio waves as radio wave clock and frequency reference source
I apologize for any inconvenience to everyone.

As the restoration schedule of this time is unknown at the moment, anyone who is using the radio clock and who is in the area where the radio wave that Saga Prefecture's "Hagane Mt standard radio transmission station" is not reaching and who goes Attention is necessary.

· Continued
Time correction by radio waves revived for about the first time in about 40 days, Ootakadayama standard radio transmission station temporarily resumes radio transmission