No one is "trying" anything. It was a legitimate question. Thanks for all the answers and interesting comments. I have a coil of LDF4-75. No one ever said it wasn't "real" either. >Nice try Rob.... >LDF 4.5 was a real thing. It was larger than LDF 4, and smaller than LDF 5. Thus the number LDF 4.5 >LDF4-75 is a real thing too. 73 Rob K5UJ