Hi, Novelda. I saw your answer regarding using two tranmitters at same space in other Q&A thread. I would like to clarify further with following two questions. We are going to use the X4 for indoor positioning of objects. As shown at the following figure, two transceivers are separated by at least 3 meters. (1) Can we use two transceivers (with same center frequency: 8.74GHz) simultaneous at the same space without interference? We are concerning that transmitted signal from left-side transmitter could be received (results in interference) by the right-side receiver and vice versa. (2) If we can, how the two transmitted signals are filtered at the X4? Is the transmitted signal frequency modulated? What is the filtering technique? Thank you very much.