Paul what 3D M has said is more or less correct. The LC of a crystal receiver is just a tuned circuit to the same frequency as you want to receive, in other words, you match it, if there is no signal to pick up there is no power in the crystal set to make it resonate, the child is sitting on the swing and not moving! The point was how to tune a receiver to 7.83HZ or how do we create 7.83Hz without using a direct LCR oscillator. The thing is the global electric circuit is a type of waveguide/capacitor where the fundamental frequency is 7.83Hz, so we have to tune to that frequency so we are in phase with it. Ah but the problem is it is a type of capacitive waveguide!!!!!!! so how do you create a waveguide which has a 7.83Hz oscillation inside it, how do you create the 7.83Hz in the first place. Regards Mike
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