NASA Tracking and nd Data relay Satellite System Three geo-synchronous relay satellites Supports 20 sub-synchronous satellites multiple-access S-band links 2. 1064 GHz forward or command link(uplink) 2.2875 GHz return or downlink Two each single-access links at s-band and Ku-band 2.025--2 120 GHz forward link(S-band) 2. 200-2. 300 GHz for the return path 13.775 GHz forward and 15.003 GHz return(Ku-band) 6/17/2004 13 13NASA Tracking and Data Relay Satellite System • Three geo-synchronous relay satellites – Supports 20 sub-synchronous satellites multiple-access S-band links • 2.1064 GHz forward or command link (uplink) • 2.2875 GHz return or downlink – Two each single-access links at S-band and Ku-band • 2.025—2.120 GHz forward link (S-band) • 2.200—2.300 GHz for the return path • 13.775 GHz forward and 15.003 GHz return (Ku-band) 6/17/2004 13 13