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Automatic picture transmission
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=== Antenna === APT images from weather satellites can be received with a right-hand [[circular polarization|circular polarized]], 137 MHz antenna. Normally, there is no need to have the antenna follow the satellite and a fixed position antenna will provide good results. The three most frequently recommended antennas are the [[turnstile antenna|crossed dipole]], [[Dipole antenna|V dipole antenna]] or the [[helical antenna|quadrifilar helix antenna]] (QHA or QFH).
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