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Old 01-05-2006, 09:45 AM   #1
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Ignition noise in Stereo

Just installed a new Pioneer CD Player/Receiver in my 1994 YJ. Significant ignition noise on the FM radio. Worse on a weaker FM signal, but still present on a solid station.

Any ideas on ways to remove it? (Other than scrapping the Supertuner?)

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Old 01-05-2006, 02:03 PM   #2
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Filter capacitor on all the grounds. Keep unfiltered ground (ie frame ground) insulated.

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Old 01-05-2006, 02:11 PM   #3
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Good advice. It is most likely alternator noise. A good low pass filter should do the trick. It helps to be fused through the fuse box. You definetly don't want to go off the battery or the cigarette lighter for example.

I may possibly have a reall good low pass filter laying around somewhere that I could pass you, if I can find it. It may be in storage.
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Old 01-05-2006, 10:39 PM   #4
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Oh boy, get to pull the console lock box again! Didn't have a problem with the old Sony that I pulled out, but this new Pioneer.........

Previously ground was a screw to the tub under the lock box. We are fused back to both the accessory and batt terminals at the fuse block.

Low pass filter---good idea. Thanks!
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Old 01-06-2006, 06:51 AM   #5
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Just remember, in order for the filter to work you need to seperate the frame of the head unit from any other possible grounds. If the casing is touching the body or connected to it in any way you will still get the noise through the ground. I'm a computer tech and electronics hobbyist so I know what a bad/noisey ground can do. Good Luck!
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Old 01-06-2006, 08:06 AM   #6
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Quote:
Originally Posted by naviathan
I'm a computer tech and electronics hobbyist so I know what a bad/noisey ground can do. Good Luck!

Cool. You don't see many electronic hobbyist anymore. I thought I was the last one. I actually don't hobby anymore, though. I've been an Electronics Tech for so long, that I don't have fun with it away from work. I DO have fun at work with it though.
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Old 01-06-2006, 09:15 AM   #7
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Quote:
Originally Posted by naviathan
Just remember, in order for the filter to work you need to seperate the frame of the head unit from any other possible grounds. If the casing is touching the body or connected to it in any way you will still get the noise through the ground. I'm a computer tech and electronics hobbyist so I know what a bad/noisey ground can do. Good Luck!
So, many of the new head units like this one are Din mounting with a metal sleeve that the unit slides into. So you have head unit chasis to sleeve contact. Sleeve then locks into my Tuffy console (again metal) and the console bolts to the tub. So in essance, the head unit chasis has a connection to the tub. Are you saying to seperate the ground wire and run it back to say the battery or what?
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Old 01-06-2006, 10:59 AM   #8
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Grounding off the battery increases your likelyhood of getting noise from the alternator. What you have going sounds okay to me, but maybe naviathan knows something. I don't think it couoldhurt you to run an additional ground to the frame, but I don't think grounding is your problem...

Where do you have the ground wire to now? The original ground?
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Old 01-06-2006, 01:31 PM   #9
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What I'm saying is you need to try and keep either your Tuffy Console insulated from the tub (plastic or rubber grommets/washers should work) or insulate the metal sleeve from the Tuffy Console. It sucks, but that connection to the tub is whats most likely causing your noise. Also, make sure your connections are all soldered together. Twist and tape works to test something, but the connections are iffy at best and can also be a source of noise. When it comes to todays micro electronics you'd be surprised at how the smallest detail can cause so much headache.
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Old 04-30-2006, 11:36 PM   #10
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Thumbs up Ignition Noise Solution

So I though I'd share my solution with the group..... After chasing grounding and a hundred other "solutions" we solved the problem. An article in QST talked about a similar problem....... Tunred out my problem was a coil wire that was not 100% seated. As a result, I had an air gap in the coil wire boot that while I was able to run the motor, was a giant RF generator. I cleaned up the contacts, firm,ly seated the wire and no more noise! Not to mention an increase in mileage!
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Old 05-01-2006, 01:13 PM   #11
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That's cool. I wouldn't have thought of that. Maybe I need to rejoin the ARRL so that I get QST again. I let it lapse a few years ago, and haven't thought much on renewing. Might need to send 'em my money soon.

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