Join Date: Mar 2009
Location: Spotsylvania, VA, USA
Re: Tuning CB Antenna (need longer antenna?)
Talking "theory" may not cure your problems, but attaching a dummy load will not do it either. That "theory" happens to be simple physics and it seems to hold up pretty well.
The point that BarryG and myself were making is that a 1:1 SWR isn't the ultimate goal. Radiating a signal is. Getting a 1:1 SWR is very easy. All it requires is a simple dummy load. That will also cure your RFI problems. Of course, you can't be heard more than a few feet away, nor can you hear anything, but hey... your SWR is nice and low.
There are two problems that Toolman has described. One is not really a problem and that's a 1.8:1 SWR. The other is an RFI problem. RFI can come from a number of things, but a 1.8:1 SWR isn't one of them. It could be a ground issue. It could be wiring, bad insulation, bad connection, the antenna interacting with other nearby metal objects and a variety of other things. Replacing the antenna might help, but only if the original has defective and didn't have a good conntection at some point.
From the description, it sounds like its tied to the ignition system or alternator. Since it doesn't happen when the bike is not running, that's a pretty good clue. You could always install a dummy load and get rid of it, but I'd suggest looking to other solutions.