Interference from power inverter.

Make sure your radio is grounded properly to start with. How do you have the power hooked up? Where is it grounded to? These things all play a part in the interference you are getting.

 

try a noise filter on the power leads to the radio . if additional grounding doesnt work .

 

Bill (or Bob's) cb shop at exit 70 on i80 in PA said there is nothing you can do about it

i also have a connex 3300 hp, 18' antennae, 4' whip and everything has been checked

so i rewired my inverter so i can shut if off while driving and if something interesting comes on the cb, i leave it off and listen, and when the info stops, i turn it back on and increase the squelch

been doing this for a few years now

 

Bob is top notch, he's the guy who does all of my work and I never hear anything bad about how my radios sound.

 

maybe it is inherent on some and not others, but he told me there is nothing i can do, and i accept him as being the grand pubah of cb's

 

You've found one of the chief reasons that "pure sine wave" inverters exist. The ones that aren't put out square waves, and the abrupt starts and stops of the wave forms put out lots of "non-linear" noise, sometimes called hash, same as a lot of inexpensive amplifiers made for the CB radio market. The signals that come out of them include the intended signal, plus a handful of wideband signals which won't be detected if all you're running with the inverter are, say, a few 110 volt lamps, a fridge compressor, a hot plate, and *maybe* a TV, if the TV has enough filtering in its power supply circuit.
In radio amplifiers, trying to use a Class C amplifier, which is non-linear, for SSB radios, which are linear, results in lots of splatter. Even though radio frequency is much higher in frequency than the 60 hertz thst your inverter's output is, it's still alternating current, and how it's made makes a difference, and the better stuff costs more.
EZX seems to have come up with a work-around for the problem, but no amount of filtering or grounding is going to fix a problem that's being generated inside the inverter and transmitted by what amounts to a tiny radio transmitter through the air. Changing the design of the inverter with enough filtering built-in would yield what you really need in the first place: a pure sine wave inverter. Sounds like Bob's is a good source of info, having told EZX that there's no practical solution, too.
Please save your money -- don't spend it at shops who'll charge for running grounds and installing filters that won't do you any good. I'm a commercial radio tech, and I've held one license or another in radio for 50 years (CB for only 40, though).
Yes, I agree there are good CB shops. But none of them will help with this problem.
73,
Handlebar

 

Since the noise is coming from the inverter, you have two options. One, stop the noise, which pretty much means replacing it. (If you do, be sure that you can take it back if it has the same problem.) The other option is to contain the noise. That means putting it into a grounded metal box, putting bypass caps on the 12v input, and running the output through an AC line filter. It wouldn't surprise me to find that you end up spending $100 to do that. Yes, there will still be some noise, but if done properly, the noise level will be significantly lower.

The sad thing is that most of it should have been already done by the manufacturer, but wasn't due to cost. That kind of stuff is the difference between a $150 truck stop inverter and a $500 RV/solar inverter.

 

You may be able to vary the noise level by changing what is plugged in and running. The charger for my laptop creates more noise than just the inverter. I'm lucky that my inverter does not make any noise on CH 19, but some things left plugged in and running will. But my inverter does make a ton of noise on other freq's.

 

it doesnt matter what i plug in, it makes the noise just by having the inverter on, period

but what i did notice is that this is the cobra model, the one i had before made NO NOISE

so i will be shopping for a new inverter soon