Figure 3. Waterfall Plot of SDR Operations Figure 4. GNU Radio Configuration Figure 5. GNU Radio Configuration Figure 6. GNU Radio Waterfall and FFT Plots Overview

A Software Defined Radio (SDR) will be used for OpenOrbit-er satellite to ground communications. The use of SDR al-lows for a smaller, more versatile radio then what a stand-ard hardware radio can provide; perfect for the unpredicta-ble environment Open Orbiter will be exposed to. Current implementation uses a simple $20 USB TV decoder for the receiver and the open-source program GNU Radio for soft-ware decoding. Broadband FM transmissions have been re-ceived and decoded successfully and on-going experimen-tation for receiving satellite communications are yielding promising results. About OpenOrbite