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View Full Version : RF interference from car alternator?


Fubar_v2.0
2007-09-17, 16:10
Not sure if this belongs in T&T but since it deals with the "waves" thought you guys might be able to help.

Sometimes my speakers will buzz in a morse code fashion when calling or receiving calls or texts on my cell phone. Lately when cars start outside the speakers will buzz in a similar fashion to the slow "chug chug chug" a turning alternator makes, in the same rythem and timing as I hear it outside. Wondering if this is even possible the alternator is creating interference for my speakers that far away or I am just going crazy.

oddballz194
2007-09-17, 16:48
First off, you posted in the right forum. :D

Second, it's quite believable for the alternator to produce RF interference. It's basically creating a moving electromagnetic field, so yes, it's a transmitter of sorts. The strength of the interference would depend on how well the system is grounded, the distance involved and the intensity of the electromagnetic field produced (among others factors).

After thinking about this a while longer, there are other explanations for the RF you're describing. If it were the alternator, it should continue for as long as the vehicle is in operation (or at least in proximity while in operation) since the alternator never stops working so long as the engine is running (we hope). The starter would produce a short-lasting RF pulse that could produce the effects you describe, as one example.

kelsokid18
2007-09-18, 19:44
It does happen quite often. I get that morse code clicking and beeping from my TV, my computer speakers, and lots of things when my cell phone wakes up. I've been searching for a solution for months.