Generating EM wave

[MrJammin]

How do I get a circuit to generate a EM wave, like a radiowave. Does anyone have links to a circuit that accomplishes this task?

 

[justDIY]

you're already generating EM waves all sorts of them in fact, just by being alive. thermal IR is the most prevelant, followed up by neuro-electrical impulses, brain waves and lastly long microwaves from all the hydrogen in your body (water)... the microwaves aren't easily detectable given the amount of background radiation our environment produces.

 

[MrJammin]

I'm aware of the fact that nearly every object radiates EM waves. I want to know how to generate a radiowave in a circuit that can be picked up by a receiver circuit a few 100 meters away.

 

[HarveyH42]

MrJammin, this isn't for some sort of Jammin device project, like for cell phones?
That's a banned topic, we don't even get to have fun debating the ethics or legality of it anymore.

 

[justDIY]

google spark gap transmitter, one of the earliest and easiest rf transmitters to build, you can transmit morse code a long ways.

 

[things]

MrJammin, this isn't for some sort of Jammin device project, like for cell phones?
That's a banned topic, we don't even get to have fun debating the ethics or legality of it anymore.

isn't the name a bit of a coincidence?

 

[HarveyH42]

Exactly what I first thought. Didn't seem to concerned about the signal or frequency...

 

[MrJammin]

I assure you I am not trying to use it for unethical purposes. I am simply a novice in the field and wanted more information on it. Specifically, I am just trying to get a circuit to respond to a signal by another circuit through a radiowave, just like how bluetooth or wireless works. Even though the distance I would be operating on is small I would be sure to avoid using frequencies reserved for the radio, etc..