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static in a cb radio
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z-volks
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Joined: March 11, 2003
Posts: 33
Location: Westport, CT
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PostPosted: Thu Oct 02, 2003 7:56 am    Post subject: static in a cb radio Reply with quote

i have just put a cb in the car and have a engine hum when i excelerate when the radio is on. I put a 100amp inline supresser on the generator and still have the problem. whats next? Ground?
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bljones
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Joined: February 08, 2002
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Location: ontario canada
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PostPosted: Thu Oct 02, 2003 9:07 am    Post subject: Reply with quote

i'm no electrical expert, but the spark plug wires may be the problem.
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chinarider
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Joined: November 08, 2002
Posts: 276
Location: San Francisco, CA
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PostPosted: Thu Oct 02, 2003 9:46 am    Post subject: Reply with quote

With a CB radio, it could be a whole bunch of things. Most likely, your antenna is picking up electrical impulses generated from your engine at the same frequency that it recognizes incoming radio signals.

Check all your grounds, and make sure your CB is grounded to the same spot as your radio (if you have one). Your spark plug wires could be another source of noise - noise suppression cables are easy to find and install. Also make sure that your antenna cable is not grounding out anywhere.
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z-volks
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PostPosted: Thu Oct 02, 2003 10:28 pm    Post subject: Reply with quote

Antena is mounted insolated on rear bumper (4'FirestikII 900 watt)has 18 foot annenna cable to connector box mounted and grounded to firewall and power goes direct to battery. The cb unit is a cobra 75 mic . also using inline filter from goldline still have problem with hum when excelerating, no radio in car. I will try the plugswires is there a certain plug wire that needs to have the supressor
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chinarider
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Joined: November 08, 2002
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Location: San Francisco, CA
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PostPosted: Mon Oct 06, 2003 2:21 pm    Post subject: Reply with quote

OK - here are a few suggestions:

1) mount your antenna further away from your engine. The rear bumper is probably too close to your engine, and you're easily picking up electrical impulses.

2) Never run your CB power directly to your battery. Look under the dash (or if you have a Thing wiring diagram - even better) for your radio/accessory leads. Even if your thing never came with a radio, the leads should still be there. If there's a ground lead, use that rather than your firewall.

3) RE: noise reduction cables (plug wires) you need to change all of them. The kits are fairly do-it-yourself-ish.

Good luck.
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