#SATELLITE RECEIVER RADIO SOFTWARE#
Software is now available that can handle the satellite tracking and recording automatically, and can even switch computer controlled receiver to the correct channel for each satellite. The audio from the receiver is fed into the line input of the computer sound card, where it is saved as an audio file (usually in WAV format) and then decoded into an image using computer software.īecause orbiting satellites are constantly moving, you also need a satellite tracking program that will tell you when they pass overhead. To receive signals from orbiting weather satellites, you need a receiver and antenna capable of receiving frequency modulation (FM) in the 137 MHz satellite band. In the UK, we also have to contend with radio pager transmitters that may radiate strong intermittent signals close to the VHF weather satellite band. A disadvantage is that their signals are more susceptible to interference from all the electronic equipment (and especially computers) that we have. Polar orbiters transmit in the VHF wave-band so the receiving equipment and aerial needed are both much simpler. Being closer to the Earth the images show a smaller area in more detail. They move all the time, so they can only be received when they are above your horizon, but when they are, the signals from them are much stronger. Orbiting satellites are only a few hundred kilometres above the Earth's surface. You need a dish antenna and some quite expensive equipment to receive images from them. However, they are further away so their signals are weak. Geostationary satellites stay in a fixed place in the sky, and can be received all the time. There are two types of weather satellite from which it is possible to receive images: orbiting satellites and geostationary satellites. You don't need to ride the Space Shuttle to see the earth from space! You can get live images on your computer by receiving radio transmissions from weather satellites (often abbreviated to wxsats.)
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