en.wikipedia.org/wiki/BPC_(time_signal)
2 corrections found
Operating since April 1, 2002
The Shangqiu BPC station was not operating from April 2002. NTSC says the Shangqiu station was founded in 2006, trial-broadcast in 2007, and formally began external broadcasting on January 1, 2008.
Full reasoning
This date conflicts with official NTSC sources about the Shangqiu BPC station.
- NTSC's current station page for Shangqiu says the station "began construction in 2006" and "formally began external broadcasting of the low-frequency time-code signal on 2008-01-01."
- An earlier Chinese Academy of Sciences report says the BPC Shangqiu station was completed and began trial broadcasting in 2007.
So the Shangqiu Time-Code Radio Station was not already operating from April 1, 2002.
2 sources
- 商丘低频时码发播台----中国科学院国家授时中心
商丘低频时码授时台…始建于2006年，2008年1月1日正式对外发播低频时码信号，发播频率68.5kHz（呼号BPC）。
- 国家授时中心BPC商丘低频时码发播台建成并试验发播（070717）
由中科院国家授时中心与西安高华科技有限公司合作建设的…BPC商丘低频时码发播台…在河南省商丘市建成并进行试验发播。
with a 4-hour break from 05:00–08:00
05:00 to 08:00 is a 3-hour window, not 4 hours. NTSC material also describes 05:00–08:00 as the station's maintenance shutdown period and separately says BPC broadcasts 21 hours per day.
Full reasoning
The stated break length is wrong on its face: 05:00 to 08:00 is 3 hours, not 4.
That arithmetic matches NTSC material about BPC's operating schedule:
- An NTSC paper states that 05:00–08:00 is BPC's shutdown/maintenance time (停机检修时间).
- An NTSC facilities page says the BPC station can broadcast 21 hours every day, which is exactly what you get from a 24-hour day minus a 3-hour maintenance window.
So the article's wording "4-hour break from 05:00–08:00" is incorrect.
2 sources
- 时间频率学报 2021 PDF (NTSC)
05:00—08:00 为BPC 发播台停机检修时间。
- Facilities — National Time Service Center
BPC low frequency time code time service station is located in Shangqiu, Henan Province. With an operating frequency of 68.5 kHz, it can broadcast time code information regularly for 21 hours every day.