I have digged in my files and found some interesting information compiled by Tom, DL8AAM a while ago, that he posted on the packet radio network. It should even be possible to decode the signal. Many European dxers have logged DCF49 on 129.1 kHz . The station is still listed by some publishers as 'BMPT, Bonn', but that is not correct. My sincere thanks to Klaus Betke for his research and to EFR Berlin for their help and information.
Long wave Teleswitching Long wave teleswitching is a new way in load management technology.
It replaces the well adapted ripple-control technology, which is widely used in the utility industry worldwide. First a few words about ripple control. It is used for tariff-switching applications and load management as well as for the control of street lighting for example. Basically, ripple control systems are used to spread information to lots of receivers installed in the supply region of a utility. Today, ripple control is not considered to be a very economical method but, for that, a relatively safe method.