Strange radio noise

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jaxman

Copper - Posts: 185

Joined: November 16, 2002

Location: Denmark

Posted: May 13, 2003 at 1:48 PM / IP Logged

Well , after solving (80%) the alternator noise now I ended up with some other NOISE.

Now I ran into another problem.

Yesterday I installed also the front speakers trough the amplifier and the sound is great(Had the front speakers firectlly on the head unit).

Today on my way to work I noticed that the sound it is noisy when I listen to radio (this problem has not been before) and it is not engine noise.

I disconnected the antenna and I plugged into the antenna jack just a short wire in the middle.The signal quality got better and without noise.

If I put back the antenna then the signal it is perturbed again.

Bought an extra antenna cable and run with it outside the car to the antenna in the back , same problem.

Bought a brand new antenna to mount on the windshield and the same noise.

If I just put the core of the antenna cable the sound it is ok but not so powerful and the signal gets lost once in a while.

Tried to take out the front speakers from the amp and let only the ones in the back like it was before …same thing.

What could be the problem ?

jaxman

Copper - Posts: 185

Joined: November 16, 2002

Location: Denmark

Posted: May 13, 2003 at 2:20 PM / IP Logged

By the way , this is happening with the engine off also.

esmith69

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Joined: November 26, 2002

Location: United States

Posted: May 13, 2003 at 6:06 PM / IP Logged

Sounds like your antenna is not properly grounded, or a ground loop exists between your head unit's grounding point and the antenna's grounding point. Most likely you just need to ground the antenna to a good, solid, paint-free spot of bare metal on the vehicle's chassis, and it should sound okay. BUT I should ask, what kind of vehicle is this? (year/make/model) Is it by any chance, a VW?

Ethan

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jaxman

Copper - Posts: 185

Joined: November 16, 2002

Location: Denmark

Posted: May 14, 2003 at 12:25 AM / IP Logged

The car it is a Mitsubishi Carisma (EU)

The noise on the radio is more like some kind of interference or something like the signal it is strong but perturbed just like then when you manually search after a TV stationon on the TV and then the image it is clear but the sound has some kind of windy noise.

I have tried to change the antenna with another one but the signal it is the same and the only thing I have changed since the signal was ok it was adding the front speakers to the amplifier.

Now let me ask you all a question :

1. Can the power cable influence radio reception ?

2. Can the RCA Cables go on the same side with the Speaker cables that come from the amp to the front speakers ?

3. If the amp it is running 1 ohm on the subwoofer can this have any influence on the speaker output ?

4. Can I run with the speaker cable (not rca) beside the power cable ?

5. Will the gear case produce any noise if I run with the RCA or speaker cables in the midle of the car ?

jaxman

Copper - Posts: 185

Joined: November 16, 2002

Location: Denmark

Posted: May 14, 2003 at 1:21 AM / IP Logged

It will be a good ideea to isolate the RCA cables with aluminium foil ?

Should I have a ground on the head unit's install frame ?

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: May 14, 2003 at 8:39 AM / IP Logged

I suspect esmith is right, you have a ground loop of some sort that is interfering with your reception. In addition to making sure your antenna is securely mounted, make sure your head unit and all amps have good, paint-free and common grounds.

Since you say the only thing that changed when you first noticed this sound was adding the front amplifier and speakers, I would begin by improving the ground connection for the front amplifier. Make sure your speaker wires for the new front speakers are not shorting to the frame of the car somewhere.

jaxman

Copper - Posts: 185

Joined: November 16, 2002

Location: Denmark

Posted: May 14, 2003 at 4:46 PM / IP Logged

I have tried to take out from the amplifier the new wires but the noise it is still there.

Tried to pull out the RCA cables also together with the speaker cables. Interference still there. Strange radio noise -- posted image.

esmith69

Gold - Posts: 1,511

Joined: November 26, 2002

Location: United States

Posted: May 14, 2003 at 10:10 PM / IP Logged

What about if you remove tha main fuse on your amp's power cable? Is the interference still there?

As for the question about the speaker wires causing interference...I have yet to experience such a thing--the reason being speaker wires just don't handle the amount of current that power cables do. now if you have some MONSTER setup that requires something ridiculously huge like 6 or 8 gauge speaker wire, then I suppose it might be possible but still even then it's pretty unlikely.

Although it's not as big of a problem as when you're running RCAs, running speaker wires next to power cables can sometimes cause interference to occur. I would say to avoid running them (speaker and power) together whenever possible.

Ethan

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jaxman

Copper - Posts: 185

Joined: November 16, 2002

Location: Denmark

Posted: May 15, 2003 at 1:16 PM / IP Logged

If I remove the power from the amp I can't hear the interference as all the speakers go trough the amp :)

esmith69

Gold - Posts: 1,511

Joined: November 26, 2002

Location: United States

Posted: May 15, 2003 at 2:09 PM / IP Logged

jaxman wrote:

I have tried to take out from the amplifier the new wires but the noise it is still there.

Tried to pull out the RCA cables also together with the speaker cables. Interference still there. Strange radio noise -- posted image.

I thought when you said that above, you meant that you unplugged the speaker wires from the amp and the interference was still there. But now I think I know what you're talking about.

You might wanna try something like the N-AI from david navone as I think it might do the trick.

Ethan

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"Patience, persistence, and perspiration make an unbeatable combination for success"

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