Yeah Paul,
A lot our traditional Ripple supply signals,
are now sent by UHF and are injected at various points around our local Grid system,
saves having Pilot systems.
Another development over here, is the use of UHF (Almost like Packet Radio), to energise and de-energise certain parts of the HV and EHV systems, around here.
But good old Radio Telephones are still used to make sure that the Disconnection has actually happened, this will never be made obselete.
Don't trust this packet stuff, for this type of work though, what about Interference, but I am sure that they have got this figured into the equation.
Here's hoping!.
