I'm trying to create two circuits that will eventually be added to a larger circuit in a custom PCB. A basic radio transmitter needs to hook into my computer via USB, and transmit data to a rudimentary radio receiver, which connects to the UART of a micro-controller. (As far as I understand, I should be able to send, receive, and translate serial data this way.)
I've done quite a bit of research, and even discovered a post on this site asking a similar question here...
I would LIKE to know exactly how RF propagation works, but I'll settle for at least knowing how to build the circuit.
I found a site here that was the most helpful...
But, it leaves some things to be desired. As far as I understand, a capacitor is charged, and used to store and release energy into an inductor. The inductor then builds up its electromagnetic field gradually until all the current is out of the capacitor, then releases the energy stored in the field back to the capacitor in the opposite polarity, forming one wave. Unfortunately, the capacitor and the inductor MUST have a resistance value, so the current will gradually diminish with each wave.
Is amplitude of the waves modulated by the amount of current? Frequency is modulated by the frequency of the capacitor release of energy, correct? That would mean that using a capacitor with a lower farad rating should produce a higher frequency?
How would one go about keeping a sustained current to the inductor since it's constantly losing current without messing up the cycle?