Okay... so let me get this straight:
The "Chewbacca" sound that you're hearing is coming from the scanner's speaker and not the CB's?
If that's the case... then it's prolly as simple as RF from the CB being injected into the scanner's circuitry and being expressed as noise out the speaker when you key up.
This may come as a shock to some: scanners and CB are
not high-quality electronics, so they tend to be quite prone to such overloads and interferences. I get the same sort of thing when I key up a handheld VHF transmitter near some cheapo computer speakers (or even so-called "good" ones). I used to get the same thing in my car back many moons ago when I started out with a CB and a scanner (a Uniden PRO-500D and a BC560xlt, FWIW).
Of course, all of this is meaningless without some suggestions to fix it. None of these are guaranteed to help, but they might:
1. Make sure your antenna connectors are soldered or crimped on properly.
2. Make sure that your antenna cables are completely undamaged.
3. Make sure the antenna connection at the back of the CB is screwed firmly in place.
4. Try repositioning the antenna cables, especially if you have them running together for any length.
5. Try repositioning the radios in relation to each other.
6. Try different radios. (Yeah, I know this would suck...)
Anyway... there's a start. Hope it helps to contain the wookie.
