Re: [DML] Radio Interference
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Re: [DML] Radio Interference



It is also very important that the antennae be well grounded too. If the antennae is not well grounded or the connection to the radio is not good, the radio will pick up a lot more noise. There can be many sources for noise. It can be going directly into the radio from the power, it can be ignition, alternator, switches, brushes in electric motors, circuit breakers and relays clicking on and off, etc. If you are still trying to use the old radio, they were noisy to begin with. Much worse than modern radios and now that they are older they are even worse. The internal parts (filters, aka caps) do not age well. The first thing to do is to make sure all of the connections to the radio and antennae are good. With the antennae back by the motor it will pick up any noise generated by the motor more easily.
David Teitelbaum

--- In dmcnews@xxxxxxxxxxxxxxx, Marc Levy <malevy_nj@...> wrote:
>
> 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@...> wrote:
> 
> From: birdwell77095 <birdwells@...>
> 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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> [Non-text portions of this message have been removed]
>




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