This is a compact Citizen Band transceiver made by Radio Shack.
CB Radio Modulation Modification is possible with this CB. RV104 is the modulation adjustment potentiometer. It is not necessary to remove any modulation limiter. Maximum modulation can be achieved by adjustment of the RV104 pot. Turn it clockwise to increase modulation. On this radio it can be turned clockwise until stop to achieve full modulation without significant distortion and a benefit net gain in total power output.