CB Noise elimination - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 12-11-2005, 02:17 PM Thread Starter
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CB Noise elimination

Ok, I have done the searchs and read most posts about this subject and have tried many of the suggestions, but still have a problem. I have a Uniden 810, 4 ft firestick, I used a SWR meter to setup, I have soldered connections on both ends of the coax cable, I have a direct fused powersource from the battery and a good connection to an underdash ground bar.

However, I still get engine whine through the CB, I can hit the accelerator and the whine increases with the RPM. When I shut the engine off it sounds strong and nice and clean. I have taken the antenna off and the engine noise is still persistent, this supposedly means that it is not an antenna grounding issue right? I have heard that inline noise elimiators do not always work but I have not yet tried one. Which make/model should I buy if that is the best next step?

So, does anyone have any ideas on what else I need to check, do , buy, etc.

Thanks for your help
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post #2 of (permalink) Old 12-11-2005, 02:31 PM
 
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Re: CB Noise elimination

Try running your cable differently first. anywhere near the tranny and it will pick up engine whine same as any amped speaker setup. Always try to run your Power down the side of the rig. with all the other power slots. Also try using a more insulated wire and check your guage. inline noise elimanators work. Go to your local High end bling stereo Store. Not best buy and have them install it and run the wire. Can't be more than 50 bucks. If I recall Minesbroken is an installer he can give you way more info on this.
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post #3 of (permalink) Old 12-11-2005, 03:05 PM
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Re: CB Noise elimination

A capacitor on the alternator output can nearly eliminate a huge amount of whine. Somebody here will be able to supply the specs, but you can probably ask for a noise eliminator cap at a parts house and get what you need.
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post #4 of (permalink) Old 12-11-2005, 03:47 PM
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Re: CB Noise elimination

Try something - engine running but surroundings quiet.
Turn the volume down all the way - ticking/noise? Find another ground for the CB.

Volume up - Tick tick tick indicates ignition - make sure plug wires are good, hood is grounded too.

Buzzing with volume up - alternator - Radio Shack or the stereo store - they have a choke and capacitor device that goes on the alternator output that suppresses most of it. $5? Plus they have an in-line filter for the power wire - attach it as close to the CB as possible - $5?.

Make sure the power wire to the CB goes directly to the battery - the IGN switch has lots of noisy stuff on it.

I used shielded coax for the power wire to mine - made a big difference too.
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post #5 of (permalink) Old 12-11-2005, 05:59 PM
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Re: CB Noise elimination

This thread caught my eye, cause I have a similar issue. I get noise when my Wipers are on. (This is on the ZJ) either front or rear wipers doesn't matter. That's the only thing that gives me static noise. Any ideas?
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post #6 of (permalink) Old 12-11-2005, 08:31 PM
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Re: CB Noise elimination

Might just be time for a new cap, rotor, wires and spark plugs too.
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post #7 of (permalink) Old 12-11-2005, 08:36 PM
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Re: CB Noise elimination

[ QUOTE ]
Might just be time for a new cap, rotor, wires and spark plugs too.

[/ QUOTE ]

hehe... won't help with the wiper motor or an alternator with issues.

[img]/ubbthreads/images/graemlins/40BEER.gif[/img]
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post #8 of (permalink) Old 12-11-2005, 08:38 PM
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Re: CB Noise elimination

Brent - wipers - brush type motors - try hanging a .01 - .05 MFD - non electrolytic capacitor across the terminals. Hot to ground, right at the motor. Probably $.99 at Radio Shack.
If it is polarized, the (-) or band to the ground side.
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post #9 of (permalink) Old 12-12-2005, 03:49 PM
 
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Re: CB Noise elimination

i have yet to tune my cb antennae. does anyone have any good info on this and wehre i can get an swr meter. i have never looked into it.
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post #10 of (permalink) Old 12-12-2005, 03:55 PM
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Re: CB Noise elimination

Often the store where you purchased the antenna, if it's an electronics store - will set the SWR for you - probably for free.
Else Radio Shack etc sells the SWR bridges - $20?
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