so, here's how it works.... you build a huge tesla coil in your back yard, and fire it up when your neighbor is listening to his stereo. he then calls the police and if he's feeling up to it "uncle charlie" (the FCC). you then get a knock at the door, and get arrested for building an "Infernal Machine" (or one of a hundred other legal terms that describe a scary high voltage contraption), and spend a few days in the greybar motel. you then come home and find a nice letter from uncle charlie asking you for a donation of $10,000.00, or you can take a nice vacation at uncle charlie's greybar hotel. or you build a power oscillator with the signal purity of an open sewer pipe. your neighbor's stereo goes silent. unfortunately you are also jamming an air traffic controller talking down a 15yr old boy who has just taken over the controls of his grandpa's (who has had a heart attack while flying) Cessna. the boy can no longer hear the air traffic controller and barely escapes alive as he ditches the plane on the interstate causing a 10 car pileup. the FAA investigates, and finds the triangulation data points to your house as the source of the signal. the FAA calls the FCC and says we have a problem, wanna help? so the nice people from the FAA, FCC, NTSB, FBI, and even the local and state police come over to your house for a nice talk over dinner. again, you get a nice vacation and asked for a few donations.....
do you really want to go to so much trouble for a few fleeting moments of quiet?
this might all sound funny, and i did want to inject a little humor into a very serious subject, but when safety of life is concerned, nobody has a sense of humor. most "jammers" are not transmitting on just one frequency, and can have effects in frequences far removed from the intended target frequency, and that's one reason there are laws against such things. people have died from such "pranks", and so people who use radio for "safety of life" communications have asked for laws to protect their ability to communicate in an emergency. if you build a jammer, do you know where your harmonics (predictable) or worse your intermod products (not so predictable) are showing up in the spectrum? most cities and towns have noise regulations. if you want him to turn his stereo down, invite the local police over to HIS house for a nice talk.......