1050 Hertz ripple injection motor generator set to control heating and streetlight systems remotely.
30 kW motor driving 21st harmonic tuned circuit generator superimposing the 1050 Hz into the 11,000 Volts network.
System Zellweger (Switzerland)
A receiver at the end user picks (customers) up the signal and runs in synch with this motor for 3 minutes. When the clicks happen at 0:44 - 0:54 in the video ON or OFF signals are decoded and equipment like hotwaters and streetlights and controlled loads can be switched ON or OFF.
The superimposed ripple voltage is around 3 to 4 Volts across the mains voltage sinewave.
A great audio fix for electrically minded people.
The freewheeling at the end takes nearly 10 minutes from 3000 RPM to standstil.
