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post #1 of (permalink) Old 08-28-2003, 07:50 PM Thread Starter
 
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CB antenna and ground

My CB is mounted in the cab and I have it grounded underneth the brake pedal. If the tuck is not running the sound is very clear. Once I turn the truck on there is a humming sound and if I am driving at freeway speed it is very unclear. Another thing is I have a Wilson fiberglass antenna mounted to my aluminum tool box. I was told that if I do this I need one of the grounded type antennas. I bought one and grounded it.

Question is...
I don't get very good reception while the truck is on. Is it my ground of the unit or antenna? I tried to wire it to the power from the radio because I was told it is blocked or grounded or something like that. Oh yeah the antenna sticks up more than a foot above the cab and has been tuned.
Thank you
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post #2 of (permalink) Old 08-28-2003, 10:58 PM
 
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Re: CB antenna and ground

e-mail tim the sandman and ask him. he is either certified in amatuer radio or is taking the classes. he knows more about that stuff than anyone ever really would need to
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post #3 of (permalink) Old 08-29-2003, 08:03 AM
Matt S.
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Re: CB antenna and ground

My understanding is fiberglass whips should be grounded through their mount. Sounds like you're getting RF interference from either the engine or radio antenna. Try using a separate source for power directly from one of the "always-on" fuses. This is how mine is powered, and I don't have too bad interference. If this doesn't work, they make in-line filters that may cancel out the noise.

Good luck!
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post #4 of (permalink) Old 08-30-2003, 01:36 PM
 
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Re: CB antenna and ground

you might have a ground loop going on.
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post #5 of (permalink) Old 08-30-2003, 01:36 PM
 
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Re: CB antenna and ground

ground it to the same place your radio is grounded too, or just run it into that wire.
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post #6 of (permalink) Old 08-30-2003, 03:44 PM
 
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Re: CB antenna and ground

<font face="Comic Sans MS">I tend to prefer running both power and ground leads direct to the battery... After doing that, I run a seperate ground from the case of the radio to the firewall or any near-by sheet metal, usually what the antenna is also grounded to... Make sure you route the wires as far from the alternator, distributor cap and spark plug wires as possible... I'm not too familiar with fiberglass antennas... One thing you may want to do is run a wire or two from the tool box to the bed of the truck just to make sure it's got a good ground...

Other than that worst case you might try a capacitor between the power and ground leads... I forget how big of one to use... I can look it up if it comes down to needing that... Chances are it'll never get perfect, but hopefully those things will make it a little better...</font>
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