![]() I’ve attached a few of the images I’ve obtained below, as well as a photo of my receiver setup. Instructions for constructing a QFH Antenna can be found Here, and a calculator for designing one can be found Here. I was also able to fully automate the process- WXtoImg is able to auto-record satellite passes, and another package, Orbitron, is able to interface with SDR# to automatically tune the radio to the correct frequencies, and, more impressively, automatically compensate for Doppler Shift by adjusting the radio’s frequency during the pass. The siginal, available by using software such as SDR#, was then run through WXtoImg, a program that decodes the NOAA satellite signals and returns images. This allows you to use a computer to listen to radio signals. ![]() You can pick up a RTL-SDR, such as the NooElec NESDR Smart, for about $30. The antenna is run through a LNA (Low-Noise Amplifier) and into a RTL-SDR (Software Defined Radio). Select the KTthermal palette, which is designed for temperature maps, and click 'Redraw the Graph'. The palettes beginning with 'KT' are designed to show certain parameters best and with ADA compliance. The satellites of interest are NOAA 15, 18, and 19. Click the drop down next to 'Color Bar' to see a selection of palettes. ![]() The antenna I made was a QFH (Quadrifilar Helix) antenna tuned to 137.5 MHZ (the approximate frequency that NOAA satellites broadcast on), and cost about $20 to make. The entire thing can be done for about $50- the hardest part is building the antenna, and that only takes a day. Who knew it was so easy to take satellite photos of the Earth? This was surprisingly simple, and worked surprisingly well. Live satellite images of the earth via NOAA weather satellites.
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