21cm Hydrogen Line Sky Survey Continuous 1 second cadence power spectra of the 21cm neutral hydrogen (HI) line at 1420.405 MHz, recorded 24/7 from a fixed omnidirectional observer on the US East Coast. What this is A radio telescope pointed at the whole sky, recording one spectrum per second, indefinitely. The Earth's rotation scans the beam across the galactic plane daily, producing a natural drift scan. Every row is a self timestamped power spectrum spanning 2 MHz centered on the HI rest frequency. Hardware Component Detail Antenna Omnidirectional L band feed probe (wide beam, zenith biased) LNA Nooelec SAWbird+ H1 — SAW bandpass + LNA, centered 1420 MHz SDR Nooelec SMArTee v5 (RTL2832U + R820T), TCXO 0.5 ppm Compute Raspberry Pi 5, Debian, headless Location US East Coast, 41.0°N 73.0°W (quantized) The SAWbird+ H1 provides a ~68 MHz usable passband (1374–1442 MHz) with peak response near 1399 MHz. The observation window sits on the upper slope of this filter. Bias tee powered from the SMArTee v5. Schema Each row is one integration period from rtl power . Column Type Unit Description date string — UTC date (YYYY MM DD) time string — UTC time (HH:MM:SS) freq start int Hz Lower band…
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