Historical Telescopes

Jansky's antenna was designed to receive radio waves at a frequency of 20.5 MHz (wavelength about 14.5 meters). It was mounted on a turntable that allowed it to rotate in any direction, earning it the name "Jansky's merry-go-round". By rotating the antenna, one could find what the direction was to any radio signal. Reber's telescope had a mirror, made of sheet metal 31.4 feet in diameter, that focused radio waves to a point 20 feet above the dish. A cylinder contained the radio receiver which amplified the faint cosmic signals by a factor of many million, making them strong enough to be recorded on a chart. Reber built a parabolic dish reflector because this shape focuses waves to the same focus for all wavelengths.

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300ft

300ft

85ft

GBI

Jansky Antenna

Reber Charts

Reber Survey

Reber Telescope

Reber Telescope

Reber Telescope
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