Reviving the thread to ask if we have any RF experts on the forum to help explain the LM altimeter signal to me. I have a family and as of recently professional connection to this part of Apollo history and I'm considering getting some representation of the radar altimeter waveform tattooed, but I'd like it to be as accurate as possible. I've heard both 13 GHz and 130Hz as operating frequencies, so that's confusing enough, but I also have no idea what an appropriate amplitude for the wave might be, or if an accurate depiction of the waveform would actually fit on a tattoo. Any help is appreciated.