Hello My AO-40 (sobsob) techniques are really rusty. I am trying to find AO-51 S band downlink. I forget the conversion frequency on a 3731aa downconverter to the two meter band. With the pass duration I don't have a lot of time to look, which I did. Anyone aim me to the correct frequency? 73 Bob W7LRD -- "if this were easy, everyone would be doing it"