Cobra 200 noisy RX

Assumeing the noise doesnt change much with coax pulled off the back...I would decide on a well known shop and see if the can look at it and explain it as they show you as to what happening..Then go from there..
To do that,shops gonna need some good calibrated gear..

 

I don't think we will ever know. He doesn't seem to want to do the coax test.

 

Ok, if Sparky didn't do the NB/ANL correctly while doing the receive alignment, it can either make the receiver a little noisier, or more deaf.
Or it's just a poor receiver circuit in the radio.
Unfortunately it's more difficult dealing with LED lights and other electronic gadgets in the vehicle that add additional noise into the radio through the antenna. Sounds like you have found a work around by slightly turning the RF gain down some. I've never used a Cobra 200, so I have no idea if noisy receive is the nature of the 200's or if it's just this particular radio. It's definitely a nice looking radio.