Hello. I want to start what I think should be a simple circuit but I am not sure. My electronics background is not very good and I have been going through the tutorials on this site. I want to build 2 circuits. The first one sends a weak RF signal which is detected by another circuit very close by and which then makes an led glow. Am I correct in thinking that in order to do this the detector circuit would need some kind of bandpass filter? any advice on how to build this is appreciated.