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Can anyone help with a radio noise problem in my mini? The orig radio had a lot of noise and interference through speaker when i bought car so being 20 yrs old i thought it was old age. Subsequently fitted new stereo and problem persisted. Purchased a noise supression unit from big car stereo store which seemed to help, but noise still a problem. Only bad on FM frquency and only while on the move as revs rise and fall but no noise at idle while stopped. |
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Tom Parker offered first advice: There are usually three sources:
Get the condensors [editor' note: capacitors] that go between the live wire and ground. Put one between coil positive and ground, and also the alternator output and ground. Do it as close to the offending part as possible and keep the wires short. Unfortunatly you have to hack the alternator wiring, or take the plug apart and attach there... Tom Also David Cushman had this to say: There is a series of tests which tell me a lot about the source of the noise. The cases are: ignition on/engine off; FM ignition on/engine off; AM ignition on/engine off; tape player or CD Repeat all three with engine running. If noise on all three sources with engine running, but not when engine off, then the noise source is almost certainly from the alternator, coming in on the DC power line. If the noise is present only with the engine running on the radio but not the tape/CD, then the source is the antenna. You didn't say, but if the noise is present on FM but not AM, I may be stumped. Report back with more details. But assuming it's present on both AM and FM, make sure you have a good ground between the antenna's base (the cable's outer shield at the antenna), and that the chassis of the radio is well grounded to the body of the car too. This is usually established by a good battery supply negative lead (assuming we're talking negative ground here). Since you have a new radio, its manual should tell if any special or additional grounding is needed.
Cheers, |