BD,
You're right, I've been around radios for a little while. You're also wrong, can't say I've ever seen that happen because of an improperly tuned transmitter. The 'catch' is that the transmitter has to be tuned properly to start with, and that it is operating into a proper load. 'Backswing' indicates an improperly tuned transmitter, one usually being driven too hard, lots of 'swing' and very little 'dead-key'. Or, if you'd like the proper terminology, too much modulation and too little carrier. If by chance you see that 'backswing' only on one channel instead of all of them, I think I'd take another look at that transmitter. Bet it's been 'mod'ed beyond reason, which is about normal/typical for most mod'ed CB equipment.
- 'Doc