This article reports on the first step in a focused program to re-optimizeradio astronomy receiver architecture to better take advantage of the latestadvancements in commercial digital technology. Specifically, an L-Bandsideband-separating downconverter has been built using a combination of careful(but ultimately very simple) analog design and digital signal processing toachieve wideband downconversion of an RFI-rich frequency spectrum to basebandin a single mixing step, with a fixed-frequency Local Oscillator and stablesideband isolation exceeding 50 dB over a 12 degree C temperature range.
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