[amsat-bb] question about ao-51

Dear amsat members. I have question about reciveing analouge signals from satellites in S- band. In amsat webpage there is only ao-51, is there any other satellite or not? another question is about ao-51, for receiving from ao-51 in s-band which technical specification of antenna is need? Is there need to track the satellite in s-band, or not, the position of antenna(azimuth & elevation) is fix. i mean is there need to locate antenna up the rotator? Any help would be gratefully appreciated. Best Regards. N.Mahdinejad