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  #1  
Old 05-13-2011, 12:46 PM
minigma minigma is offline
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Default Cb electrical noise

I did a search for cb wiring and cb help and came up with nothing. I 've seen the threads on where to mount. But I'm having trouble with electrical noise i have moved my ground and am using a factory ground point under the cup holders in my 02. They have whatever box under it grounded there so i thought i could ground my Cb there too. Still a lot of electrical noise. Any help would be appreciated. Where's the best place to ground and are there any other things i could do.
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Old 05-13-2011, 01:07 PM
Pickupman04 Pickupman04 is offline
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Default Re: Cb electrical noise

Run your ground and power direct to the battery! And check your sheilding on your co-ax and power wires
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Old 05-15-2011, 12:30 PM
minigma minigma is offline
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Default Re: Cb electrical noise

Ok so after moving my power to the battery I was still getting Noise. I then proceeded to look into it more on the net. I came to the conclusion that the biggest fault was my antenna. Being a magnet mount Wilson lil wil' I have discovered that the antenna needed a better ground. So aside from replacing the antenna the only choice i had was to run a wire from the whip to the body of the truck. It does work much better but I believe i will eventually get another firestik and mount it straight to the body.
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Old 05-20-2011, 10:30 AM
Krogoth Krogoth is offline
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Default Re: Cb electrical noise

Whats this about electrical noise? I have my CB powered though the fusebox on the passenger side in the kick panel, and at the first place I had my antenna mounted I didnt have it grounded.

I want to learn more about CB's and how they function before I buy a more expensive CB radio. Any help would be appreciated.
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  #5  
Old 05-20-2011, 10:41 AM
Clinton Clinton is offline
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Default Re: Cb electrical noise

Try looking up noise filters for cb's. It eliminates alternator, electrical noise etc.
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Old 05-20-2011, 12:07 PM
FireRanger FireRanger is offline
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Default Re: Cb electrical noise

There is usually no simple solution to RF noise. The course of action depends on where the noise is coming from. Some noises can be blocked/filtered, some can not.

If the noise is a static hash kind of noise that doesn't change much, then it is radiated noise from the ignition system. Coil pack, wires, spark plugs, etc. This noise can not be filtered. It is being radiated and picked up by the antenna. The only way to make this kind of noise go away is to find the source and eliminate it. This can be a major PITA. This was often never a problem on older rangers since the steel hood and body panels provided shielding. But newer vehicles with fiberglass hoods = no shielding. I have had some mild success cocooning the coil-pack in tin foil and grounding it to the chassis. Looked ridiculous though. You may have some success moving the antenna around, though not a sure fire thing.

If it is a high pitched whine that rises and falls with RPM, then it is AC electrical noise leaking from the alternator and coming in through power wire. This can be filtered easily. There are a number of off-the-shelf RF noise filters you can put on the power input to the CB. They are cheap and easy. Good solid connections on your power wires is also critical.

Quality, correct antenna mounts, cable connections, and coax routing is also critical. While we're on this topic, the correct length of coax cable from the CB to a single antenna is the shortest distance possible with a small amount of slack to move around. Do NOT coil up excess cable. Do NOT use 18ft because someone told you it was "optimum" (huge lie). Avoid sharp bends and kinks. And keep them weatherproofed.
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Last edited by FireRanger; 05-20-2011 at 12:10 PM.
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Old 05-20-2011, 01:31 PM
Krogoth Krogoth is offline
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Default Re: Cb electrical noise

HAHAHA! Actually the shop that did the original installation for everything told me longer was "right". I had the excess coiled up under the rubber matting on the passenger floor. Its not like that now. Ive moved the cable so that I can mount the antenna behind the cab, but its not mounted yet.

So with the new location I have very little excess cable, Im going to ground the antenna to the frame, no sharp bends or anything that Im aware of, probably not weatherproofed.

I dont remember any electrical noise from the AC system. Probably dont have the most solid power connections though, might look back into that.

I hate having to learn about everything the hard way. lol.
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Old 05-20-2011, 01:39 PM
FireRanger FireRanger is offline
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Default Re: Cb electrical noise

CB Shops are notorious for having employees that do not have a clue what they're talking about. Usually, take whatever they tell you, and do the exact opposite. It seems to be a side effect of inbreeding or something.

AC leaking from the alternator, as in Alternating Current. Not air conditioning A lot of times, the rectifier in the integrated voltage regulator is less than 100% perfect so you get some leaks.

When you say you're grounding the antenna, you mean you're grounding the mount, not the center pin, right?
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  #9  
Old 05-20-2011, 01:44 PM
Krogoth Krogoth is offline
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Default Re: Cb electrical noise

Quote:
Originally Posted by FireRanger View Post
AC leaking from the alternator, as in Alternating Current. Not air conditioning
I understood which AC you was refering to lol. As I said though, I dont recall anything that sounded like that type of noise.

As for grounding the antenna, the FireStik antenna I have has a wire that I was told and continue to presume is the ground. From what I understand thats supposed to be screwed into the antenna mount and since the new mount is either going to be on my truck bed or the toolbox on my bed, it wont be grounded because the bed isnt grounded. Does this sound correct?
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  #10  
Old 05-20-2011, 03:33 PM
minigma minigma is offline
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Default Re: Cb electrical noise

The bed is grounded. As long as you are bolting it to Metal on the truck it will be grounded. Although if your tool box is aluminum it will be grounded but it won't be as good a ground as the steel of the truck. My problem is that I am using a magnet mount and if I understand right i need a larger area of flat ish sheet metal to give me a larger "ground plane" which is how the magnet grounds to the truck. Guys, correct me if I am wrong.
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