I am new to this. I have a Westclox SG-7 that says Greenwich on the back, and "to reset signal tilt backwards." I'm guessing it expects a radio signal to sync to. Do these signals still exist? Where can I learn about them? The clock acts peculiarly, and I suspect that might have to do with expecting the signal, but a circuit schematic or any other data would help me figure it out. Please point me to where I can get some info on how this sort of clock should work. Thank you.