The S-Band Transmitter from Endurosat is a Space Transmitter with Mass 250 g, Frequency Range 2200 to 2290 MHz (commercial) / 2400 to 2450 MHz (ISM, Frequency Stability +/- 1.0 ppm, Data Rate 20 Mbps, Transmitting Power 0.5 to 2 W. More details for S-Band Transmitter can be seen below.