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CB Radio Forum - Discussions regarding Citizens Band Radio (CB)

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  #21 (permalink)  
Old 08-27-2017, 10:10 PM
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"CB chassis ground using heavy stranded battery cable about 12 inches long to bolt on floor of cab."

^Take that one off. ^

That should cut down on some of it.
If it's still bad bond the truck body parts together like in Jaymojave's link.
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  #22 (permalink)  
Old 08-28-2017, 5:31 AM
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I've been lucky with my 1996 F250 7.3 diesel. I plugged my CB radio into the factory-supplied power port on the dash, put a magnetic Wilson 1000 on my roof and have experienced no problem noise at all. It must be a specific-truck thing. I don't know.

Regarding the OP's problem, I would try the filters mentioned, I would also change the ground location. I "think" I remember that the OP installed the radio ground where other devices are grounded. Maybe changing the location of the radio's ground could help.
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Old 08-31-2017, 2:30 PM
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So, I put on the RF chokes. I think it helped, maybe slightly. I also removed the CB chassis ground going from CB chassis to floor of cab. Not sure that did anything, but it did not hurt anything.

Saw the suggestion to move the negative ground to a different location. Will try that. Afterwards, if there is no improvement, I think I'm done and will live the results.

Thanks again for everyone's suggestions. Much appreciated.

e
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Old 09-03-2017, 8:37 PM
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Quote:
Originally Posted by emzungu View Post
So, I put on the RF chokes. I think it helped, maybe slightly. I also removed the CB chassis ground going from CB chassis to floor of cab. Not sure that did anything, but it did not hurt anything.

Saw the suggestion to move the negative ground to a different location. Will try that. Afterwards, if there is no improvement, I think I'm done and will live the results.

Thanks again for everyone's suggestions. Much appreciated.

e
Do you have a portable am radio? Walk around the vehicle, Fuel pump, alternator and cooling fans is most likely. Capacitor solution. I've never had a diesel, but I always thought they would be quiet!
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Old 09-04-2017, 4:03 AM
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Quote:
Originally Posted by Mustang131 View Post
Do you have a portable am radio? Walk around the vehicle, Fuel pump, alternator and cooling fans is most likely. Capacitor solution. I've never had a diesel, but I always thought they would be quiet!
The good ones were! Mechanical injection doesn't make RF noise. It's these new-generation things with the electronic/hydraulic injector systems (thanks, EPA) and ECM's that create noise beyond the usual suspects of alternator, fan motor, wiper motor, fuel lift pump, etc ad nauseum.

But a decent inline filter should help kill it. I second the notion of taking a portable radio around the pickup looking for sources. If it isn't bad that way, then it might just be making its way into the CB through the power connection. If so a good filter might just kill it. Key word might.
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Old 09-04-2017, 9:00 AM
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Hello 131 and All: Yeah a small transistor radio will work, but you have to wrap it up in aluminum foil and allow a small opening near the antenna so that it only picks up noise from a select direction, instead of all directions, which will send you inside playing with your spit!.

The Op has not told us yet if removing the antenna coax from radio while receiving the noise, goes away or stays. I am thinking the noise is being radiated into the air being picked by the antenna and radio. I am betting its being radiated into the air. So a inline power wiring filter won't work.

Another problem hear I believe is the Op has never probed around looking for noise, so this is new and probably not understood by him. Not his fault.

Trouble shooting EMI or RFI ( Electromagnetic Interference / Radio Frequency Interference ) even by professionals is not easy sending most walk away frustrated and pissed off at the world. Resulting in walking away needing a totty or two. I know, I've done it many many times. If you keep at you will fine the source of the noise being radiated, and shield the wiring or install snap on ferrite cores over the source wiring. Again good luck.

Jay in the Great Mojave Desert
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