Hi all, On two passes this evening I and others heard the "strange" noise on the AO-51 transponder, when AO-51 was far to the North. It was the same on the fifth of July. Most probably it is someone trying DSTAR on the satellite. AO-51 is not made for that and has not been opened to DSTAR transmissions as far as I know. If you want to use DSTAR on satellites use AO-27 where the control stations say it is OK. The problem is that you are blocking the normal use of the transponder. 73 OZ1MY Ib