I am doing a Wireless ECG. I get the ECG signal and I transmit it via FM. Once I input the ecg signal to the FM transmitter input the CRO automatically displays frequencies in MHz range even without any link/connection from the circuit to the CRO. The trace goes away when I remove the ground connection from the Fm transmitter and comes only when I connect the ground clip back to the transmitter ground! I am using a Transcend MP3 player as the FM receiver.
What could be wrong?