BPL is the call sign of the official long-wave

time signal A time signal is a visible, audible, mechanical, or electronic signal used as a reference to determine the time of day. Church bells or voices announcing hours of prayer gave way to automatically operated chimes on public clocks; however, audi ...

service of the

People's Republic of China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...

, operated by the

Chinese Academy of Sciences The Chinese Academy of Sciences (CAS); ), known by Academia Sinica in English until the 1980s, is the national academy of the People's Republic of China for natural sciences. It has historical origins in the Academia Sinica during the Republ ...

, broadcasting on 100 kHz from CAS's

National Time Service Center The National Time Service Center (NTSC; ) has the task of generating, maintaining and broadcasting standard time in China. It is located in Xi'an, Shaanxi, China. Its predecessor was the Shaanxi Astronomy Observatory of the Chinese Academy of Scien ...

Pucheng County, Shaanxi Pucheng County () is a county in the east of Shaanxi province, China. It is under the administration of the prefecture-level city of Weinan Weinan () is a prefecture-level city in the east central Shaanxi province, China. The city lies on the lo ...

at , roughly 70 km northeast of

Lintong Lintong District (), formerly Lintong County, is one of 11 urban districts of the prefecture-level city of Xi'an, the capital of Shaanxi Province, Northwest China. The district was approved to establish from the former ''Lintong County'' () by th ...

, along with NTSC's short-wave time signal BPM on 2.5, 5.0, 10.0, and 15.0

MHz The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose expression in terms of SI base units is s−1, meaning that one he ...

. BPL broadcasts

LORAN-C Loran-C is a hyperbolic radio navigation system that allows a receiver to determine its position by listening to low frequency radio signals that are transmitted by fixed land-based radio beacons. Loran-C combined two different techniques to p ...

compatible format signal from 5:30 to 13:30 UTC, using an 800 kW transmitter covering a radius up to 3000 km.

References

External links

长波授时 (Longwave time signal)
from the National Time Service Center, Chinese Academy of Sciences {{China-stub Time signal radio stations