Alt whine in the radio

[julie at menloparkrandd.com (julie@menloparkrandd.com)]

Thanks for all the replys guys.
Grounds were my first thought. I ran the radio and amp gnds to the same lug on the rear tail light stud with out cleaning the area first.
I used heavy gauge Monster wire (speaker wire) for power, I figure it would carry the current. I'll look into it more this weekend.

>-----Original Message-----
>From: Rave Racer 77 [mailto:raveracer77@yahoo.ca]
>Sent: Monday, April 23, 2007 03:11 AM
>To: 'John S. Lagnese', julie@menloparkrandd.com, 'A Org, Scirocco'
>Subject: Re: Alt whine in the radio
>
>Comm Tech to the rescue. I'm surprised Chris hasn't said anything, unless I 
>missed his post.
>
>Firstly I'd check the grounds, or as I saw someone say earlier, just run a 
>lead directly to the neg terminal on the battery which is the same as 
>grounding, to test if this is the problem. I've seen this as a problem both 
>from the deck's ground being bad and the amps. If it improves after this 
>test then try to remount the ground wire from the plug into a better 
>position. Maybe new wire or a better contact patch where it meets the 
>chassis. Maybe wire it directly to the battery permanently or at the very 
>least look for a better ground inside the dash. I have heard of the ground 
>inside the deck going bad and needing to open the deck to fix it, but I've 
>never seen it.
>Secondly, move the signal cable and power cables away from each other. At 
>least 6 inches should do. Inductive capacitance will allow high freq 
>oscillations from your power to jump to the signal and out your speakers.
>Thirdly, even if there is power jumping over to your signal lines you can 
>clean them up with filter caps or crossovers. They aren't overly expensive 
>relatively.
>Filter Caps: One way a capacitor works is basically it's a break in the 
>line but it still allows freq oscillations across a gap. Power is not 
>allowed to pass directly while certain frequencies are. This is a very 
>simplified explanation for the context of this subject. Another thing a Cap 
>will do is store a little power to reduce the inconsistencies in power 
>fluctuations during a surge or short loss of power. It reduces strain on 
>your cars power system and allows more consistant power to your amplifier. 
>You just pick the kind of cap you want and put it in line. Again very 
>simplified and a good Car Audio store should be able to provide good advice 
>on choosing the right size and how and where to mount it. Now you might say 
>that I make two conflicting statements, it doesn't allow power to pass 
>directly while it provides consistent power but both statements are true. 
>The power provided by your car has a frequency to it and that's what you're 
>trying to block. The power provided by the cap is not really provided at 
>all, it just charges based on power being drawn into it then it releases it 
>when it's needed. Very simplified again.
>Cross Overs: Now these are a little more complicated. It's a combination 
>of an Inductive coil and a Capacitor. The two are matched to block all but 
>specific frequencies. You can set them allow all your audio frequencies or 
>you can get a couple and block your lows from going into your High range 
>speakers while blocking your highs from going into your Subwoofers. Same 
>thing here, it takes a little math and a good Car Audio shop will know how 
>to figure out what freq range you are trying to pass and what your trying to 
>block.
>
>I'm no expert, just an enthusiast. I'm sure there's other options as well 
>but these are fairly simple to implement.
>
> Rave Racer
>Current:
>'91 Jetta GLI 2.0L 16V
>'81 Scirocco Mk1 1.8L 8V Digifant 2
>'86 Fox
>2 GTI parts cars
>
>Gone:
>'89 Jetta 1.8L 16V GTX
>'87 Audi 4000 Quattro
>'72 Triumph GT6
>
>http://spaces.msn.com/raveracer77/photos/
>http://www.myspace.com/rave_racer
>___________________________________________
>----- Original Message ----- 
>From: "John S. Lagnese" <jlagnese@massed.net>
>To: <julie@menloparkrandd.com>; "A Org, Scirocco" <scirocco-l@scirocco.org>
>Sent: Sunday, April 22, 2007 19:25
>Subject: Re: Alt whine in the radio
>
>
>> Noise filter, usually a capacitor with 3 wires. Black - ground, red - 
>> power in, blue - power out.
>> ----- Original Message ----- 
>> From: <julie@menloparkrandd.com>
>> To: "A Org, Scirocco" <scirocco-l@scirocco.org>
>> Sent: Sunday, April 22, 2007 4:55 PM
>> Subject: Alt whine in the radio
>>
>>
>>>I got it. Dont want it.
>>> What do I do?
>>>
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>>
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>
>