RF newbie here.
Lately I've been experimenting with RF. I built some simple oscillators, managing to get a tank circuit working as well as buffering the 1 megahertz output of a tin can oscillator. Great.
Then I attached a spool of wire and a listened to a nearby AM radio tuned to 1000 kilohertz. Upon connection of the wire antenna, it silenced (due to the lack of amplitude modulation from my little circuit). Wonderful.
But one thing is nagging me...how do I increase the power of the transmission? Now everything online says something about power, blah blah, watts, blah blah. But nothing really explains how it works. How do you increase the power?
I could make the antenna the right length. That would help.
More voltage or amplitude of the carrier frequency? Right now it's running on 5 volts. It'll probably have an effect to some degree, but I don't really think this is the right way to do it...
More current? This doesn't make sense. It's just a wire connected to an oscillator! Nothing is flowing into the wire. How would you increase the current to the antenna? This just does not make sense at all.
So how do you inject more power into the antenna? More current doens't make sense, so I guess the voltage must be increased. But...that doesn't make sense either. Those commercial stations broadcasting on kilowatts must use a extremely dangerous amount of volts!
Could someone explain this to me?
More specifically, how does radio power work? How would one amplify signal going into an antenna?