CB engine noise over antenna?? - JeepForum.com

 
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post #1 of 10 Old 05-18-2010, 07:48 PM Thread Starter
cidd
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CB engine noise over antenna??

Installed new cb and I have bad engine noise comming over the antenna . I hooked the cb up to a jump box to make shure the power wirers were not the problem and its fine but as soone as you start the motor all hell breaks loose. I used the tail light type mount and have it grounded to the chassie with a nickel size area of bare metal and four bolts the only thing I can think of is the antenna itself might not be making good ground with the mount I may have to remove it and try cleaning some powder coat off and try agine. Anybody have any other ideas???

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post #2 of 10 Old 05-19-2010, 12:32 AM
Jerry Bransford
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Have you by chance swapped in any so-called "performance" spark plugs that are low resistance designs?

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post #3 of 10 Old 05-19-2010, 05:51 AM Thread Starter
cidd
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Put some E-3 plugs in about a week ago not shure if there low resistance or not
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post #4 of 10 Old 05-19-2010, 07:44 PM Thread Starter
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Ok its seems to be the fuel pump so how do you get rid of it ?????
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post #5 of 10 Old 05-20-2010, 03:24 AM
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Might try snap on style toroids AT the fuel pump itself. Use a few, they are cheap.
How the fuel pump grounded? Check this too.

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post #6 of 10 Old 05-20-2010, 05:17 PM Thread Starter
cidd
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Ok guys if I hold the antenna the noise from the fuel pump goes away ???. Bought this set up from rightchannel sent them an e-mail and they tell me to put a noise filter on the cb I dont even have it powerd from the jeep yet its running off a jump box so I know the noise is comming from the fuel pump is squeels when you first turn the key to power then stops then when you start the jeep it comes back on and stays on that is untill you touch the antenna???
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post #7 of 10 Old 05-20-2010, 05:35 PM
Kovelan
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Agree, it's the fuel pump. They are asking you to put on a "brute force" filter on the CB.
Nothing more that capacitors and inductors. Still believe toroids will work, or at least help.
And they are cheap. Also a cap across the power/gnd leads near the fuel pump might help
too. Toroids act like inductors when placed on the power/gnd wires. Try this first. Better
to try and fix the source than band-aid the radio. If you finally do use the "brute force" filter
do it at the pump.

KD5DWQ
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post #8 of 10 Old 05-20-2010, 07:49 PM
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Just do this. Most filters that you can buy are junk. This will work for alternator noise, fuel pump noise, wiper noise etc.

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post #9 of 10 Old 05-20-2010, 10:06 PM
Kovelan
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Perfect picture of a toroid installation! They appear to be the toroids that radio shack sell too.
(thanks!) Try this first. Always do the easiest and cheapest first.

KD5WDQ
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post #10 of 10 Old 05-22-2010, 08:47 AM Thread Starter
cidd
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I found a noise clipper from walcott it hooks in to the antenna cabel at the cb and cuts any noise comming from the antenna its $23.00 so I figured Id give it a try Ill let you know if it works.
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