So, it begins - My name is Mike Davis and I am working to provide industry a place to discuss technical systems, operation and troubleshooting tips and advise. I have spent over 38 years of my life in Telecommunication for the rail industry.  You will find most of the discussion is radio theory as it applies to the rail industry.  But, I hope this will be a repository for information for different industries on various systems and you are willing to share what you know.