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This paper describes the radio astronomy instrument flown on both Polar Orbiting Geophysical Observatories II and IV (OGO-II and OGO-IV). The instrument was designed to map the brightness distribution of cosmic noise over the sky at 2.0 and 2.5 MHz by using the theoretically predicted ionospheric focusing of an electrically short antenna. An antenna impedance bridge was included as a necessary part...
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