[ceptimus]

I built a radio clock transmitter that transmits a weak signal on the longwave band (60kHz or 77.5kHz) so I can set all the radio clocks and watches in my house to whatever time I want.

I did it because in some rooms the real signal, which comes from Cumbria in the north of England, is too weak and one of my clocks sometimes sets itself wrongly or doesn't adjust to the correct time and instead runs using its internal, less accurate, quartz movement.

By turning up the power of my transmitter, I could also set any radio clocks in nearby houses to the wrong time, but that would be unethical and illegal, so I won't do that.