Radio Japan 1 is a NHK based radio which is the parent broadcaster of the radio. Like its other cousin radios Radio Japan 1 is targeted to deliver the people of Japan with high class news based radio programs. Radio Japan 1 also provides various intuitive talk shows for their listeners.
Radio Japan 1 official website address is www3.nhk.or.jp
If the Radio is extremely choppy and stops every 5 seconds, try listen to this Radio at different time.
Not all Radio Stations function for 24 hours everyday. If you can't listen to any Radio, try to listen at different time, as the Radio Station may stop during midnight according to its own country time zone.