taco chaser
Supporting Sponsor
Doe's anybody know how to remedy vehicle noise interference on the CB?
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vehicle noise on the CB ?
- Thread starter taco chaser
- Start date
CaliCruiser
Adventurer
Did you tune it with an SWR meter?
Dylan
Dylan
Rockrunner
Observer
taco chaser said:Doe's anybody know how to remedy vehicle noise interference on the CB?
Check you ground wire, most common problem.
taco chaser
Supporting Sponsor
Power source is plugged in to the fuse block and the ground is attached to a body ground behind the drivers side interior kick panel, would a chassis ground be a better option?
Rockcrawler
Adventurer
taco chaser said:
Try running your power/ground directly from the battery. If it solves your problem you know that you need "cleaner" wiring. If not, you've got some sort of EMF (I think that's right... too early and no coffee) that is messing w/ things. My money is on the ground though...
Good luck!
Is it ignition noise you are picking up?
CBs are typically poorly shielded, so it may be directly into the box, but the antenna feed and power feed are more likely to pick up the noise. The same principles apply like any other radio install. Also, ground the box of the radio in the cab at the intstall point.
Run power and ground directly to the battery as mentioned above. Route the wires as far from the alternator and coil as you can. Fuse both the positive and negative wires. Some have had luck using coax to bring power from the battery-that way the power lead is shielded along it's length. Don't do this if you are running a higher powered illegal output CB. Regular coax should handle the amp or two the CB will draw on transmit.
Mount your antenna and coax as far from the motor as you can, that cuts down on ignition noise pick up. Make sure the antenna is grounded the way it's designed, as some are no ground antennas. You could borrow a friends mag mount and see if that has cleaner reception, or at least check it in different locations on your truck.
Tune the antenna SWR-this won't cut noise much if at all, but it will protect your output transistors.
In about 3 posts someone will suggest that you move up to Ham radio.....:wings:
CBs are typically poorly shielded, so it may be directly into the box, but the antenna feed and power feed are more likely to pick up the noise. The same principles apply like any other radio install. Also, ground the box of the radio in the cab at the intstall point.
Run power and ground directly to the battery as mentioned above. Route the wires as far from the alternator and coil as you can. Fuse both the positive and negative wires. Some have had luck using coax to bring power from the battery-that way the power lead is shielded along it's length. Don't do this if you are running a higher powered illegal output CB. Regular coax should handle the amp or two the CB will draw on transmit.
Mount your antenna and coax as far from the motor as you can, that cuts down on ignition noise pick up. Make sure the antenna is grounded the way it's designed, as some are no ground antennas. You could borrow a friends mag mount and see if that has cleaner reception, or at least check it in different locations on your truck.
Tune the antenna SWR-this won't cut noise much if at all, but it will protect your output transistors.
In about 3 posts someone will suggest that you move up to Ham radio.....:wings:
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taco chaser
Supporting Sponsor
Yeah I'm a CB rookie moron, I just backed the squelch up and it works perfect, but thanks for all the help guy's, I had the squelch set for picking up other signals opposed to vehicle to vehicle if that makes sense.AndrewP said:
gary in ohio
Explorer
Fixing the issue will depend on where the noise is really coming from. Is it the engine, fuel pump, vehicle computer,etc.
Check out http://www.k0bg.com/noiseid.html for iding the noise source. Its a ham radio page but noise is noise. FWIW, changing the SWR isnt going to fix the problem.
Check out http://www.k0bg.com/noiseid.html for iding the noise source. Its a ham radio page but noise is noise. FWIW, changing the SWR isnt going to fix the problem.
pete.wilson
Adventurer
Hey
Another suggestion is actually grounding the chassis of the CB to a good clean vehicle ground. Also, make sure your CB coax doesn't run next to any major power wires in the vehicle which can cause noise interference problems as well. Try not to use the cigarette lighter jack for your power, on most vehicles they are a dirty source of 12v with lots of noise. Good grounds are very important, so are are good crimps and always use heatshrink! Good luck.
Another suggestion is actually grounding the chassis of the CB to a good clean vehicle ground. Also, make sure your CB coax doesn't run next to any major power wires in the vehicle which can cause noise interference problems as well. Try not to use the cigarette lighter jack for your power, on most vehicles they are a dirty source of 12v with lots of noise. Good grounds are very important, so are are good crimps and always use heatshrink! Good luck.
S
