Alex Statsenko on X: "T-2 month August, 1957, Magazine "Radio" №8, USSR Detailed instructions on methods for observing an artificial Earth satellite (antenna setup, preparation for observations, recording the signal onto magnetic tape, determining the time of satellite passage, and ionospheric observations) and operation of the direction-finding attachment"
T-3 month
July, 1957, Magazine "Radio" №7 - Announcement of artificial Earth satellite frequencies and recommendations for radio amateurs
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