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Horn Antenna for RTL-SDR Radio Astronomy

October 14, 2013 admin

Rishi Patel has written on his blog about his radio astronomy project which involves an RTL-SDR and an impressive homemade horn antenna.

The horn antenna is constructed from cardboard foam and aluminium foil and is mounted on a telescopic mount. The horn then connects to a waveguide feed which is constructed out of a large metal can. The antennas waveguide then connects to a microstrip filter and LNA before finally connecting to an RTL-SDR. Rishi then uses a simple python program to gather the IQ samples from the RTL-SDR, and then draw the power spectral density plots.

Horn Antenna
Homemade Horn Antenna for Radio Astronomy

With this setup Rishi was able to detect the Hydrogen line. Rishi also used a second even larger horn with a different design to plot the spectrum shown below of the Cygnus (red), Cassiopeia (green), and Cepheus (blue) constellations.

largeHornSpectra
Spectral Plots of Cygnus (red), Cassiopeia (green), and Cepheus (blue) constellations.

The post Horn Antenna for RTL-SDR Radio Astronomy appeared first on rtl-sdr.com.