TRANSIT GROUND STATION 001.
JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB
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Transit Ground Station 001 is located in Howard County, Maryland, at an elevation of 484.53 feet antenna height. The station has the following capabilities. Simultaneous observations of the doppler shift in frequency of any two of the following three pairs of frequencies may be made 54 mc324 mc C system 150 mc400 mc Z system and 162 mc216 mc B system. One set of doppler data, corrected for the first-order effects of ionospheric refraction, may be obtained for each frequency pair of the two observed. The refraction correction may also be obtained separately. The corrected doppler data are obtained in digital form as period count versus time. The data are in 5-level teletypewriter format on punched paper tape ready for transmission to the Transit Control Center. The refraction correction is obtained in analog form on one of the stations two dual-channel strip-chart recorders. In lieu of the refraction correction, either the AGC outputs as a measure of signal strength or the frequency outputs from four tracking filters may be presented on both strip-chart recorders. As a backup, or for test purposes, the receiver output signals are recorded in analog form on magnetic tape along with a 50-kc time signal for later play back and digitization.
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