SEDSAT-1 Frequencies

SEDSAT-1 Downlink Frequencies

Mode A Transponder (Not currently operational)
Uplink	145.915 to 145.975 Mhz (2 Meter Band)
Modulation	Linear transponder will support SSB, CW, FM, AM
Downlink	29.350 to 29.420 Mhz (10 Meter Band)
Modulation	Linear Transponder will support SSB, CW, FM, AM AFSK 300 bps Hf Packet Compatible telemetry downlink

Mode L Transponder

Uplink 1,266.684 to 1,266.690 MHz (23cm band)

Modulation FSK digital data at 9600 bps
Uplink deviation must be approximately 10 KHz

Downlink 437.910 Mhz (70 cm band)
Many ground stations are reporting a center frequency of approximtaely 3-5 KHz above this (437.914 Mhz)

Modulation FSK digital data at 9600 bps

Mode L Transponder
Uplink	1,266.684 to 1,266.690 MHz (23cm band)
Modulation	FSK digital data at 9600 bps Uplink deviation must be approximately 10 KHz
Downlink	437.910 Mhz (70 cm band) Many ground stations are reporting a center frequency of approximtaely 3-5 KHz above this (437.914 Mhz)
Modulation	FSK digital data at 9600 bps

Data Rate: 300 bits/sec AFSK packet data 9600 bits/sec or 57,600 bits/sec

RF output per transponder will be 3 watts average and 15 watts max

To communicate with SEDSAT you will need:

70 cm reciever.
9600 bps FSK modem (see AMSAT documentation for UoSat Oscar 22, Kitsat Oscar 23)

For uplinking to the digital transponder you will need a 23 cm (1268 MHz) transmitter at about 10-25 watts and steerable medium gain antennas in both Azmuith and Elevation. These can be mounted on the same boom as the 70 cm recieve antenna.

You will also need a computer with programs that we will supply later to copy our satellite. As an added bonus you can communicate with the same equipment to the UoSats and Kitsats which are already in orbit.

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