RE: [DML] Radio Interference

["John Hervey" <john@xxxxxxxxxxxxxxxx>]

Marc, 
RFI as you know is in the air because all the wires in the car act like
antennas and can even pick up noise from a car next to you. 
Grounds are good but a lot of it has to do with the equipment. Newer and
higher quality radios have better filters and noise reduction built into
them so going under a bridge you would get less interference.
Some shops sell may sell capacitors that hook up to the hot wire going into
the radio that will filter some of the noise to ground but a higher quality
radio with a good antenna will now days filter it's self. I finally took out
the Craig and put in a Kenwood and 99% of the noise went away.

John Hervey
www.specialTauto.com



-----Original Message-----
From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of
Marc Levy
Sent: Wednesday, July 04, 2012 2:36 PM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: Re: [DML] Radio Interference

Yes, I was speaking of the ground path at the radio.  If the radio does not
have a good/solid ground it is a common cause of all sorts of noises.


--- On Wed, 7/4/12, birdwell77095 <birdwells@xxxxxxx> wrote:

From: birdwell77095 <birdwells@xxxxxxx>
Subject: Re: [DML] Radio Interference
To: dmcnews@xxxxxxxxxxxxxxx
Date: Wednesday, July 4, 2012, 12:53 PM

The alternator has a new ground so I doubt it is that. Though the ground on
the radio might be bad as you suggest.

--- In dmcnews@xxxxxxxxxxxxxxx, Marc Levy <malevy_nj@...> wrote:
>
> If we are to believe some of the reports, you need to add a ground bus!!  
But, if we want to fix the problem for real....
> 
> Is the noise you are hearing ignition noise?  or alternator noise?  Are
you running just the head unit (low power), or do you have external
amplifiers?
> 
> If it is ignition noise, the capacitor at the coil may be bad.  You may
also have a bad ignition wire or 2.  One of the reasons "resistor plugs" are
common in cars is to reduce the ignition noise.
> 
> If it is alternator noise, then you probably have a ground loop.  One
common problem is if the actual ground wire to the radio is loose, dirty, or
not connected at all.  The radio will still work if it is finding a path to
ground through some other device (like, the antenna)... But because of the
added resistance in the ground path, you will pick up all sorts of
electrical noise (like, the alternator whine).
> 




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