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Old 12-28-2009
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CB Radio Feed Back... Need Help

So I installed a CB Radio in my truck and mounted it to the transmission tunnel next to the shifter
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Well, it has been there for a few months now and now it is giving me problems and its driving me crazy. It will receive great but when I transmit I get feedback through my am/fm/cd player and I can hear myself through my truck speakers.

Any ideas of what would cause this and how to fix it?
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Old 12-28-2009
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mines mounted the same exact place but facing front to back on the tunnel and i never had any problems with it id guess it your antenna location but idk
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Old 12-28-2009
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Is any part of the coax running close or parallel to the truck speakers ?
Also check the mount for the CB itself .Make sure the screws into the floor are still tight to get a good ground to the radios case.
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Old 12-28-2009
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I have the antenas mounted to the bed rails and the coax cable is run under the truck along the frame and into the under side of the cab.
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Old 12-28-2009
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Make sure all the shielding on the coax is in good shape, not broken or missing, and that the guts of the cable arent making contact with any metal anywhere. Also, make sure all your connectors are good'n'tight. Those are the two big ones that can cause the feedback you're talking about. You've got a "leak in your pipes" so to speak, just gotta find it.
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Old 12-28-2009
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no good power and ground wires will cause this also. run better shielded lines and to better ground
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Old 12-28-2009
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you might want to try as well a inline filter. normally used on car audio system to eliminate noise generated by the transmission/engine.

and vacumn your carpet, you pig... lol!! a clean truck is well behaved truck
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Old 12-28-2009
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I'll pull the cable and check it today and will look into the filter.

Yah I hadn't cleaned the truck in a while just been to cold
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Old 12-28-2009
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good ground wiring and power with shielded wire you should need any filter.
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Old 12-28-2009
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It have power and ground wires wired into my cigerit lighter and I pulled the coax cable out and it's fine but still have the noise
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Old 12-28-2009
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Quote:
Originally Posted by marc83 View Post
It have power and ground wires wired into my cigerit lighter and I pulled the coax cable out and it's fine but still have the noise
thats why. run power from dist block and run ground to something better then that an actual body ground or run it back to the battery... what kind of wire did you use? hopefully not cheap speaker wire
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Old 12-28-2009
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I used the wires that came with the radio. And it's wired in to my cigerit lighter adapter
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Old 12-28-2009
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yes get it off that do i need to say it again?
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Old 12-28-2009
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Would it be better if I wire it in behind the sterio maybe? Sence I don't have wire to run it to the battery.
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Old 12-29-2009
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go to radio shack or any auto parts store and buy some tire. no going to the radio is worse your getting it closer to the interference
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Old 12-29-2009
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CB coming over the AM/FM is usually caused by either a front end overload of the AM/FM radio or the antennas are coupling.

Reroute all of the wires to and from the CB and maybe move the antenna.

Step 1) Ground the chassis of the CB, with a separate wire or ground braid, from a screw on the rear of the CB chassis to a good metal point. Check the grounding point with a multimeter to make sure you have a good connection to the frame.

Step 2) Re-wire the CB with both the red and blk wires going directly to the battery with a fuse on the red wire as close to the battery as feasible.

Step 3) Check the antenna mount for grounding to the frame using the multimeter.

Step 4) If steps 1,2 and 3 don’t do it, temporarily mount the antenna in a different location and see if the coupling of the antennas is still a problem.
NOTE: Maybe if you can borrow a mag mount antenna and mount it at the rear of the vehicle and see if that helps and then try it out on the roof and see how that works or vice-versa.

Maybe consider the temporary antenna moving first, remember it is all theory nothing more, what will work on one vehicle wil not on another.

luck,ltr
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