Steven, Welcome to AMSAT BB

Check Mike's DK3WN  website http://www.dk3wn.info/satellites.shtml for more info about Oscar satellites ,And his SatBlog http://www.dk3wn.info/p/ for Oscar and cube sat  uptoday activities.   good luck ,   Nader , st2nh www.st2nh.com

h ? Could I please ask ? how many SATs are currently active carrying transponder for amateur radio voice communication. ? And the designators as called (such as AO-7, AO-51 etc) and which SATs are linear (SSB / CW) and non linear (FM) ? Regards, Stephen ZL1TPH ?