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Unread 06-04-2012, 11:40 AM   #1
pikegulley
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CB Interference

I have a Cobra 29 lx in my rig and when I turn my rugged ridge led lights on I get significant interference. I'm assuming it is due to the way the lights are wired. They are wired to the original fog light switch on the steering column. I have a friend who has 4 of these lights and has no issue with them and the cb (he has the same cb).

I have the cb power source ran directly to the battery and grounded to the frame on the passenger side in the cab.

Any opinions what is going on? It's not a huge ordeal right now since i don't have any night runs planned anytime soon.

Thanks!

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Unread 06-04-2012, 06:57 PM   #2
CJ7-Tim
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Use the original fog lamp switch to power a relay to run the lights. Your JEEP will thank you, and the CB probably will have less interference. Connect both the CB power and ground to the battery.
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Unread 06-04-2012, 08:07 PM   #3
pikegulley
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Quote:
Originally Posted by CJ7-Tim View Post
Use the original fog lamp switch to power a relay to run the lights. Your JEEP will thank you, and the CB probably will have less interference.

Hmmm.....I had a shop install them while they were doing my gears. So I'm not sure how they exactly hooked it back up to the original switch. I Should have done it myself.
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Unread 06-04-2012, 08:11 PM   #4
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Quote:
Originally Posted by CJ7-Tim View Post
Use the original fog lamp switch to power a relay to run the lights. Your JEEP will thank you, and the CB probably will have less interference.
If they truly are LED, they probably draw so little current that it's not a concern. I'm curious as to how they wired them. However, adding a relay certainly can't hurt.

How did you run your Coax? It might be close to a hot wire, causing interference.
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Unread 06-04-2012, 10:15 PM   #5
streetglideok
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Try grounding the CB straight to the battery, and see what happens. That may be your issue.
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Unread 06-04-2012, 11:22 PM   #6
SnowdogMarc
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Originally Posted by streetglideok View Post
Try grounding the CB straight to the battery, and see what happens. That may be your issue.
X2^ what he said
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Unread 06-04-2012, 11:24 PM   #7
ctak24
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I know that the Cobra 29 LTD Classics have the ANL/NB on switch that you can turn on or off. Not too sure about the newer LX models. Make sure that the ANL/NB is on.
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Unread 06-05-2012, 09:51 AM   #8
pikegulley
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Originally Posted by ctak24 View Post
I know that the Cobra 29 LTD Classics have the ANL/NB on switch that you can turn on or off. Not too sure about the newer LX models. Make sure that the ANL/NB is on.

Those are turned on.
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Unread 06-05-2012, 09:52 AM   #9
pikegulley
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Quote:
Originally Posted by SnowdogMarc View Post
X2^ what he said
I'll give that a try and see what happens! Thanks!
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Unread 06-05-2012, 09:55 AM   #10
pikegulley
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Quote:
Originally Posted by sjones26573 View Post
If they truly are LED, they probably draw so little current that it's not a concern. I'm curious as to how they wired them. However, adding a relay certainly can't hurt.

How did you run your Coax? It might be close to a hot wire, causing interference.
I think that the coax is fine. I have it running from the top of the roll cage down to the passenger side of the bed under the liner to the back. I wouldn't think that a wire running those front lights would be all the way back there.
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Unread 06-07-2012, 08:44 PM   #11
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First determine if the noise is transmitted or power/ground. To do this turn on the CB and disconnect the antenna from the back. DO NOT TRANSMIT but note if the noise is gone. If the noise stopped it is transmitted noise. reconnect the antenna.

If the noise didn't stop and only happens when the lights are on, improve the power and ground connections to the lights. If it is still an issue measure your SWR with an external meter and post the results.

If it did not go away improve the power and ground of the radio. To do this first step is power and ground directly to the battery.
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Unread 06-07-2012, 09:12 PM   #12
ctak24
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Quote:
Originally Posted by JPNinPA View Post
First determine if the noise is transmitted or power/ground. To do this turn on the CB and disconnect the antenna from the back. DO NOT TRANSMIT but note if the noise is gone. If the noise stopped it is transmitted noise. reconnect the antenna.

If the noise didn't stop and only happens when the lights are on, improve the power and ground connections to the lights. If it is still an issue measure your SWR with an external meter and post the results.

If it did not go away improve the power and ground of the radio. To do this first step is power and ground directly to the battery.
some people use CB coax to run the hot and ground wires to the battery using the center conductor as the hot lead and the outer braid as the negative lead. Supposedly this reduces interference through the radio. Never tried it though.

If the interference noise stops with the antenna unplugged, try grounding your tailpipe. I had major interference coming in through the antenna on my Camry and my radio tech told me to ground the tailpipe/exhaust because it can possibly act as an antenna radiating electrical noise coming from the engine.
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Unread 06-07-2012, 11:15 PM   #13
JPNinPA
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He said it's only when he turns on his lights. But Yes the exhaust, fuel pump, even engine block/ ign system causes transmitted noise that is difficult to trace down. More likely on older vehicles.

As for the coax power is overkill and noise can come in through the ground just as easily as the power.
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