Prime Focus Feed Horn
A telescope engineer readies a feed horn to funnel radio waves into a receiver on the Green Bank Telescopes Prime Focus. This is where the radio waves come together after they have reflected off of the telescopes 100-meter dish.
The GBT’s huge metal feed arm towers 200 feet above the dish, ending in a retractable boom at the Prime Focus. Radio waves can pour directly into a receiver cradled in a metal-framed box on the boom. The boom can tilt and twist to align the receiver perfectly to the incoming waves.
Credit: B. Saxton, NRAO/AUI/NSF
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