Who Built the Receivers Used on the Green Bank Telescope and What Technology Do Their Detectors Use?28 Jul 2016, 09:26 UTC
Question: What is the primary company that built the transmitters and receivers in the Green Bank Telescope. Is the receiver design Supercooled Superheterodyne or does it use Supercooled FPGAs. — Adam
Answer: NRAO builds most of the receivers (there are no transmitters) used on the Green Bank Telescope (GBT). The rest of the GBT receivers are built by university groups. All of the GBT receivers use either superheterodyne, high-electron-mobility transistor (HEMT), or Monolithic Millimeter-wave Integrated Circuit (MMIC) technologies which operate at very low temperatures (less than 20 K).