21. Both pendulums were seconds pendulums, about 1 meter ( 39 Hz timing signal . 22. The format of the service is similar to that of radio time signal services. 23. The Russian time signal RWM transmits an additional correction dUT1 in 0.02 s increments. 24. The above method is primitive real-time signal optimization at best. 25. The Ottawa, Ontario, Canada broadcasts an exclusive digital time signal encoded using AFSK modulation. 26. BBC radio stations broadcast the " six pips " of the Greenwich Time Signal . 27. It provides increased accuracy thanks to its use of time signals from Galileo satellites. 28. This procedure combines encryption algorithms already in use with time signals delivered by Galileo. 29. One sort of public time signal is a striking clock. 30. A relatively low-powered transmitter can overwhelm the weak timing signals broadcast by orbiting satellites.
