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The aim of the article is to present the design, simulation and construction of a double cross antenna to receive APT images from NOAA15 satellites (National Oceanic and Atmospheric Administration) in a semi-urban environment. To achieve better performance of the antenna, its height above ground, the length and diameter of the elements, their angle of inclination with respect to the axis of the antenna coordinates and the coupling with a 50Ω SMA type connection port were adjusted. The built antenna allowed to receive APT images in real time, with a maximum resolution of 120dpi, gain of 4.8dBi and frequency deviation of ±17 KHz. The modulated carrier arrived at a frequency of 137 MHz and was processed by devices and tools: RTL-SDR, Sharp SDR, audio piping and WXtoimg software for decoding images. It is concluded that in semi-urban environments the double cross antenna receives well APT images. However, it is susceptible to the Doppler Effect and noise due to the presence of low order nulls.

Recepción de Imágenes Meteorológicas de Colombia con una Antena de Dipolos Cruzados