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post #1 of (permalink) Old 04-21-2003, 05:02 PM Thread Starter
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Radio Static With Engine RPM

This must be an easy problem, I just can't find it.

My radio has a nice static hum to it. As I increase the rpm of my engine, the fuzz-ing gets louder. I figure it's the ground on the radio that is bad, but re-attaching it did not solve it.

My radio has seen better days and actually does not light up anymore. This sucks because it is a digital radio... but i think the fuzz-ing is due to another problem.

Oh yeah, the static only occurs with the radio and not the CD player.

It must be ground... not sure where to look next.
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post #2 of (permalink) Old 04-21-2003, 05:16 PM
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Re: Radio Static With Engine RPM

A Cd's does not take it signal from the air ways. I think you should take a look at your plug wires and see if they are frayed. Also check to see if the alternator wires are frayed. These with not running resistor type plugs will cause radio static. One way I've been told to check for noise is get a walkman and walk around the engine compartment to see where the loudest static is and there's your answer. Good luck, Radio? What radio, my road music is a 383 ci Chevy engine with original Cherry Bombs.



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post #3 of (permalink) Old 04-21-2003, 05:42 PM
 
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Re: Radio Static With Engine RPM

noise is not necessarily from airwaves.... it could be from wiring.... get a noise suppressor (filter)...very cheap ...radioshack or circuitcity... plugs onto hot line going to your radio or amp.... [img]images/graemlins/smirk.gif[/img]
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post #4 of (permalink) Old 04-21-2003, 05:54 PM
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Re: Radio Static With Engine RPM

</font><blockquote><font class="small">In reply to:</font><hr />
noise is not necessarily from airwaves.... it could be from wiring.... get a noise suppressor (filter)...

[/ QUOTE ]
[img]images/graemlins/goodpost.gif[/img]
Yes that could also be. I did have to get one when I hooked the amp up in "BigUgly" my `73 Blazer. The radio worked fine without a buzz and then, BBBUUUZZZZ, down to RS I went and came out with a filter, no more buzz.


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post #5 of (permalink) Old 04-21-2003, 10:54 PM
 
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Re: Radio Static With Engine RPM

Most likely the plug wires are the culprit. I'm willing to bet if they are replaced it will cure the problem....but that's just my opinion from however many thousands of miles away I am.

Before we were married my wife had a Ford Escort. The wires got so bad I could actually see them sparking on the television screen whenever she came over to visit!
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post #6 of (permalink) Old 04-22-2003, 08:02 AM
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Re: Radio Static With Engine RPM

From what I've learned the hard way:
ANY noise connected to bad ground or not-enough-isolated wires can and MUST be found &amp; repaired without buying noise filters. If the noise is from the bad gnd/bad isolation, then no noise filter in this world will solve it. First, and best thing you could do is to make the GNDing wire as THICK and as SHORT as possible! That (gnd) wire picks up the noises that come from plugs/plug wires/alternator. The longer the wire, the bigger the noise. Plus, those other wires mentioned above by some fellow Jeepers need to be changed (spark wires, and basically all the "red" (hot), high-tensioned wires are suspects. The "greater" tension wires first, so that's why it's usually the spark wires, or the alternator wires. So, DON'T run your radio GND from the engine compartment, there's no need. Instead, ground it as close to the radio as possible. Make it a good, fat, clean contact. Then check plug wires, alternator (+) etc.
I bought filters &amp; filters, put them zillions one behind another, I even built my own filters. What the noise filter does is a high-cut: it cuts out high frequencies (which you hear as whining noise). But that way you either kill power flow to the radio (which you will notice as radio-lights dimming to the beat), or if you put that hi-cut filter in series with the speaker, it'll kill most of the highs in the spectrum, leaving you just with a lot of bass &amp; low-end mids (not nice, actually [img]images/graemlins/puke.gif[/img] ).

Als, if you have an amp...They tend to create such whining prbs. They can, and absolutely MUST be GNDed short &amp; thick.

So, in my oppinion, after checking all the wires &amp; finding nothing (experience [img]images/graemlins/crazy.gif[/img] ), go &amp; get some well isolated wires to hook up the radio. And some nice, fat, StarTrek-style-isolated speaker cables. Once you get'em, they'll last almost forever, in every case longer than any car you might put'em in, so you'll always be able to transfer them somewhere else.

BTW, wanna hear some serious whine? We here use (90%) the FM waves. Switch to AM or MW area, and tune to empty (where is no station). There you go, some SERIOUS whining.
Or put in the blank casette &amp; hear the "silence" (everything BUT silence). There you get all the "failures" to show.

Up to date, I didn't find the way to kill it. Not that I use anything but CD &amp; FM, but...
post #7 of (permalink) Old 04-22-2003, 12:33 PM Thread Starter
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Re: Radio Static With Engine RPM

just picked up a set of wires and will throw them on.

Engine music? Man, that nice rumble of 150ci 4 is oh so sweet. Wait, that was the moped that just passed me.

Thanks for the ground wire techniques, i will use them. I'll save the filters in case these two fixes don't do it.

90% of the FM freq. are used must be a good variety of music - if they are being used for it. I live kinda close to New York City and the radio selections are so bad. Makes me wonder why I need to fix the radio.

I guess to drown out the mopeds....
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