A Very Weird Problem

I have an Idea,

Remove your serp belt so the alternator does not spin, use your battery to drive down the street. Do this and get back to , tell me what happens!! If you do have something going on w/ your alarm, the alternator could amplify & magnify this estranged signal, also the signal(s) might vary depending on the engine rpm which changes the speed of the pulley on the Alt itself. This is just s theory, but a plausible one.

A few things need to be present for all of these strange things to happen. 1) The creation of 1 or more signals(wide range of frequencies) 2) Transmitter of some sorts( possibly something Alarm or Radio related) and 3) Amplifier or something that can magnify such a signal.

Dante30

I still don't see how any of this is possible. To be shotgunning a wide array of frequencies all at once would be nuts. A lot of R&D goes into making sure crap like that can't happen (read: you cant do it even if you try).

I have no idea how this could happen either. I went to Drexel University for electrical engineering and this just doesnt sound right. The only thing I see making this happen is if you have an aftermarket alarm that was wired up wrong? Thats my only guess...

I'm here to tell you it's possible, what ever it is it's most likely in the VHF, UHF, SHF range. If so you could be interfering with certain government communications. Now the actual engine it's self should be incapable of producing such frequencies, but your car alarm certainly is. However in my experience RF is a strange thing, if you think you know it, well, let's just say a wise man realizes he knows nothing. There are several algorithms and or codes it needs to match up with. I suppose an engine could produce a signal of sorts. Anytime metal passes by metal an induction (electrical pulse) occurs. Hence you can connect an oscilloscope to an engine to diagnose certain problems. However, there would have to be some high voltage source amplifying it and a radiating element. It's an unlikely scenario, but possible.

My first move would be to disconnect the car alarm completely, and preferably remove it from the car. If that does it, have a shop professionally install it. If not, what I would do is find someone with a frequency spectrum analyzer, who ever owns it is going to have some knowledge of the radio spectrum. Their going to be able to tell you what range it's in and may be able to localize the radiation. If you can't figure it out then. You should probably contact the FCC 1-888-225-5322 (1-888-CALL FCC) for further guidance. There's a good chance they would have to come out and investigate so they can determine if there needs to be a new regulation to control such emissions. On second thought, you might want to call them first.

Hope you find it helpful, let me know how it goes.