This is a very handy item that we sell lots of in our shop at Lymm Truckstop. It is a clamp-on filter that has got a variety of uses.
Interference usually gets into your CB in three possible ways, through the power lead, Co-Ax cable or the mic cable.
It can be noise from an Alternator, which sounds like a whining noise that changes frequency with your vehicles RPM.
It may sound like digital noise which can come from the engine management system, on-board computer, phone or GPS system.
More commonly, it can sound like a squealing sound that you can hear through the CB speaker, or the person you are talking to may hear it. This is RF feedback, it is normally caused by a poor antenna ground, (earth.)
This filter may help in each of these cases, you don't need to disconnect any wiring or plugs, the filter snaps open, you place it over the wire, then snap it closed again. You should fit it as close to the CB as possible. You may need to try it on each cable to get the best results. For very bad interference, you may need more than one. (e.g., one on the power lead and one on the mic'.)
The filter can also be used on most devices such as car radios, DVD players and TVs etc.
Limited stock on this product.