Make sure the antennae is connected and good, Then you may try an anti-static kit from radio shack.
Static crackling should not be audible under the following circumstances: 1). On AM radio, when listening to stations that are sufficiently near/strong. 2). On FM radio, anytime. If static is heard constantly, here are some suggestions for the source: 1). Defective fluorescent light or light dimmer nearby. 2). Electric motor nearby with deteriorated brushes or other internal sparking. 3). Radio is defective. Note: Intermittent static crackling during nearby thunderstorms is normal and interesting, especially on an AM radio.
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.
The first radios were untuned radio telegraphs that broadcast a burst of radio static generated by a powerful arc when keyed. The receiver used a device called a coherer to detect this burst of radio static and activate the telegraph sounder. It took the development of vacuum tube triodes to modulate radio waves with voice and music as well as provide tunable radios. Armstrong invented improved receivers like the Superheterodyne and improved modulation techniques like FM that rejected static and noise.
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