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This particular radio has no built-in feature for this. The add-on variable-carrier kits sold for Cobra 29 type radios will work on this one.


But only if the tech that does the install can work out the instructions for him/herself. The schematic diagram for that radio is on CB Tricks.


But there is no convenient wire jumper that can be removed from the circuit board and replaced with a carrier-control circuit.


As a rule, this involves cutting a gap in one copper foil trace on the circuit board, and hooking it to each side (the right side) of the cut.


There might be a detailed "how-2" for this online somewhere. Never have looked for it.


73