Here are a few WVVB items, I found while looking over YT which I found interesting and even drool worthy. MSF Radio Clock Data Monitor start-up https://www.youtube.com/watch?v=PHfeSe6PDbU DCF77 Analyzer / Clock v.2 demo https://youtu.be/ZadSU_DT-Ks WWVB Atomic Clock https://www.youtube.com/watch?v=KtphmPt2g3M Seems two of the three are one-offs with no documentation as to how to build them. Donald R. Resor Jr. T. W. & T. C. Svc. Co. http://hammondorganservice.com Hammond USA warranty service "Most people don't have a sense of humor. They think they do, but they don't." --Jonathan Winters