OK0EPB

(Exact Pendulum Beacon)

ok0epb@ok0epb.cz

Transmiting schedule(Edit)

Beacon transmiting dots every seconds, without transmiting call, foF2 index and time number. In full minute transmit dash after three dots.

foF2 source

Realization(Edit)

Pendulum is enclosed in a vacuum chamber (by www.vakuum.cz) to avoid the impact of changes in atmospheric pressure. Infra red sensor detected position of pendulum. Software measured and evaluated gearing a la Froment electrics system

System status(Edit)

Phase (deviation pendulum running within one second).

Link detailed status

Earthquake 14. Aug 2012(Edit)

in sea of Okhotsk (49.784°N, 145.126°E) with [magnitude 7,7 http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usc000bz29.php]

Seismogram from Prague

Pendulum deviation

Dependence frequency error on air pressure(Edit)

between 15 and 21 Dec 2011

Results of G3PLX measurement at 12/13 Dec 2011(Edit)

Here attached is a good record from last night. The channel was clear of the Sura ionospheric radar which has been there for a week or so. This shows two shift pulse events, with the pendulum running about +3ppm between them. The 60mS point on my graph is the same point as the 0 mS point on your Phase graph. The 60mS difference is made from (1) 50mS because you measure the start of the dot and I measure the centre, (2) 4mS because I am 1200km from Prague, and (3) 6mS which we think may be the key-click filter in your transmitter.

Squadron of pendulum(Edit)

  • Frantisek OK1DF - Founder and the mastermind
  • Petr ex OK1IRG - Software developer
  • Jan OK2ZAW - Beacon hardware
  • Peter G3PLX - Invaluable assistance
  • Dan OK1HRA - It & webmaster