Methods for simultaneous excitation and acquisition enable measurements of signals with ultrashort T2* relaxation times. In this work, a method was developed and implemented to analogously compensate leakage of the excitation pulse into the receiver channel due to imperfections in coil tuning and the quadrature hybrid utilized in cSWIFT setups. The setup was enhanced with an embedded system, a vector modulator and a summing unit to subtract the leakage from the signal. Feasibility of the real-time compensation was demonstrated. Leakage was reduced by up to -40 dB.