Hi all, I'm searching for informations on the AN/URQ-10. It is a shipboard frequency standard, based on an ovenized 5 MHz crystal. Mine powers but has no output. I have not been able to find useful informations on the web, except that it was part of AN/WRN-5, one of the first satellite navigation system, later known as Transit. Any help is welcome! Marco IK1ODO Torino Italy