Radio frequency Condensers (Capacitor) is used to reduce or eliminate ignition noise being received by the broadcast radio in the car.
Check the ignition switch itself, sounds like it may be the problem.
It is RFI generated from the ignition system. dI/dT very fast di/dt is rf
Because my plugs, points, and ignition wiring haven't been replaced in a long time, and please stay out of my truck from now on.
radio lol
There are a few possible causes. If the static changes with engine revs then you have a suppression issue. If the noise is general regardless of whether the engine is running then you need to look at the antenna or the radio itself. Ignition noise will typically produce a "tic, tic, tic" sound on the radio and is likely to be due to arcing around the HT leads or distibutor. The alternator can produce a whining noise if the suppressor is bad. The antenna can perform badly if it is damaged or if its earth connection to the car bodywork does not make a good electrical contact. If you think it might be your radio try substituting another.
While rectification pulsations are caused due to ac not being converted to dc perfectly. This causes hum (low frequency humming noise). To smooth these pulsations filters are used. Noise is an unwanted signal in the communication system.
Before anyone can give a sensible answer to this question, whoever asked it should please log in and edit the question to explain what exactly what "noise" is being asking about. Noise in the street? Noisy hi-fi systems? Noisy reception in a radio? Picture noise in a television?
turn the radio off
It's picking up the alternator as it spins. In some cases the radio or antenna may not be shielded anymore or if so equipped the noise suppressor has failed. You might be able to get a noise suppressor from a stereo shop.
The most common cause of noise in your AM radio is a loose or corroded ground wire. Clean and tighten the ground wire and the AM noise should disappear.
Terrestrial noise is noise that originates on the earth. Extra terrestrial noise comes from space.