BPM

From Signal Identification Wiki
Jump to: navigation, search
BPM
BPM.jpg
Frequencies 2.5 MHzMegaHertz (MHz) 10^6 Hz2,500,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
2,500 kHzKiloHertz (kHz) 10^3 Hz
,5 MHzMegaHertz (MHz) 10^6 Hz5,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
5,000 kHzKiloHertz (kHz) 10^3 Hz
,10 MHzMegaHertz (MHz) 10^6 Hz10,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
10,000 kHzKiloHertz (kHz) 10^3 Hz
,15 MHzMegaHertz (MHz) 10^6 Hz15,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
15,000 kHzKiloHertz (kHz) 10^3 Hz
2,500 kHzKiloHertz (kHz) 10^3 Hz
2.5 MHzMegaHertz (MHz) 10^6 Hz
15,000 kHzKiloHertz (kHz) 10^3 Hz
15 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range 2.5 MHzMegaHertz (MHz) 10^6 Hz2,500,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
2,500 kHzKiloHertz (kHz) 10^3 Hz
- 15 MHzMegaHertz (MHz) 10^6 Hz15,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
15,000 kHzKiloHertz (kHz) 10^3 Hz
Mode AMAmplitude Modulation
Modulation AMAmplitude Modulation
ACF
Bandwidth 3.5 kHzKiloHertz (kHz) 10^3 Hz3,500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.0035 MHzMegaHertz (MHz) 10^6 Hz
3.5 kHzKiloHertz (kHz) 10^3 Hz
0.0035 MHzMegaHertz (MHz) 10^6 Hz
3.5 kHzKiloHertz (kHz) 10^3 Hz
0.0035 MHzMegaHertz (MHz) 10^6 Hz
Location China
Short Description BPM is a time signal transmitted by the Chinese Academy of Sciences, broadcasting from CAS's National Time Service Center in Pucheng County, China.
I/Q Raw Recording
Audio Sample
BPM is a time signal transmitted by the Chinese Academy of Sciences, broadcasting from CAS's National Time Service Center in Pucheng County, China.


Characteristics[edit]

Signals emitted in advance on UTC by 20 msmilliseconds (.001 of a second). Second pulses of 10 msmilliseconds (.001 of a second) duration with 1 kHzKiloHertz (kHz) 10^3 Hz tones. Minute pulses of 300 msmilliseconds (.001 of a second) duration with 1 kHzKiloHertz (kHz) 10^3 Hz tones. UTC time signals are emitted from minute 0 to 10, 15 to 25, 30 to 40, 45 to 55. UT1 time signals are emitted from minute 25 to 29, 55 to 59.

BPM Transmission Format
Minute Duration Transmission
00 30 10 UTC: 10 msmilliseconds (.001 of a second) second ticks, 300 msmilliseconds (.001 of a second) minute ticks.
10 40 5 Carrier (no time code)
15 45 10 UTC: 10 msmilliseconds (.001 of a second) second ticks, 300 msmilliseconds (.001 of a second) minute ticks.
25 55 4 UT1: 100 msmilliseconds (.001 of a second) second ticks, 300 msmilliseconds (.001 of a second) minute ticks.
29 59 1 Station identification: Morse call sign for 40 seconds, then voice announcement "BPM 标准时间标准频率发播台" ("BPM standard time, standard frequency transmission station") twice for 20 seconds.

Samples[edit]

BPM Morse code identifier to voice to 10ms UTC beeps

100 msmilliseconds (.001 of a second) UT1 beeps

Another example of 100ms beeps going into Morse code, then voice, then 10ms.

Frequencies[edit]

BPM is transmitted by the Chinese Academy of Sciences National Time Service Center in Lintong, Pucheng County, Shaanxi Province, China. Location on Google Maps

Certain frequencies are broadcasted on at certain times of day.

MHzMegaHertz (MHz) 10^6 Hz UTC China Standard Time
2.5 7:30-1:00 15:30-9:00
5 0:00-24:00 0:00-24:00
10 0:00-24:00 0:00-24:00
15 1:00-9:00 9:00-17:00

Video Examples[edit]

Additional Links[edit]

Additional Images[edit]