AMSAT-OSCAR 51 (Echo or AO-51)
Analog Uplink:	145.920 MHz FM (PL - 67Hz) 1268.700 MHz FM (PL - 67Hz)
Analog Downlink:	435.300 MHz FM 2401.200 MHz FM
PSK-31 Uplink	28.140 MHz USB
Digital Uplink:	145.860 MHz 9600 bps, AX.25 1268.700 MHz 9600 bps AX.25
Digital Downlink:	435.150 MHz 9600 bps, AX.25 2401.200 MHz 38,400 bps, AX.25
Broadcast Callsign:	PACB-11
BBS Callsign:	PACB-12
Launch	June 29, 2004

Status:  Operational
Amsat-OSCAR 51 or Echo as it is more commonly known is a FM satellite carrying 4 VHF receivers, 2 UHF transmitters, a multimode receiver and a 2400MHz transmitter. It can handle voice and FSK data up to 76.8Kbps. Echo was launched into a low, sun-synchronous polar orbit approximately 850 km high. It is planned for operational turnover on 30 July 2004 at approximately 0215z. You must transmit a 67Hz PL tone in order to access the Echo voice repeater.

Please note the change in operational phone downlink frequency to 435.300 MHz.

See Echo Project Status for additional information about Echo and scheduling of various modes of operational.

For more information, see the Echo Project Page