The History of InfoAge Science & History Museums

Space Age - How Radar Will Watch Satellite

Published in Popular Science in the September 1955 issue; Page 132

Web editor note: The buildings in the background are from the SCR-271-D used during WWII and for Project Diana. The wooden building on the right will be demolished. We believe the concrete building on the left was incorporated into an expanded Diana Dish control center building found on the site. It is part of the Camp Evans Historic District. The new dish was built upon the frame of a captured German Wurtzburg Reise radar unit.


This huge new radar will keep in touch with the moon —and possibly with the planets.

SUPPOSE you were asked to referee a sandlot basketball game in Boston from a seat atop the Empire State Building in New York. Impossible? That’s what scientists will do to observe the man-made satellites being launched in 1957-58.

The “birds” are basketball-size. They’ll be 200 to 300 miles away.

Actually it’s quite simple to see so far with radar. The long and delicate finger of electronics can reach greater distances to find even smaller things.

The size is important. A small object —with dimensions close to the length of a radar wave—is “tuned ” to the wave striking it and bounces a great deal of the wave’s energy back. It’s the same thing that happens when you strike a musical note and a nearby water glass vibrates the note back at you. The small things are easy to “see” with radar—seagulls and geese, for example, often cause false warnings on our coast-defense radar.

The bird-watchers might use equipment like the Signal Corps’ new moon-tracking radar, which can keep the moon under continuous observation and could probably contact Venus and Mars.

The new moon radar, called Diana, is the biggest of its type yet built. It pinpoints the moon with a stream of high-powered radar pulses, averaging an output of 50,000 watts and using up enough electricity to light a city. A small electrical brain keeps this searchlight trained on the moon the way an antiaircraft gun is kept aimed at an enemy plane.

Scientists at Evans Signal Laboratory are anxious to learn how the atmosphere and space affect very short radio waves. They use the moon as a gigantic mirror to reflect their radio waves back to earth. This permits them to study, waves that have traveled nearly half a million miles. Even longer paths could be secured by using a planet as a mirror.

page created April 24, 2007

19 February 2023 2:00 pm - 3:00 pm
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Sunday February 19th For a Wonderful Vacation, Go by Train! Railroads, Tourism, and Commuters at the Jersey Shore By Bill Elwell 2PM-3PM Hotel Lounge Nestled halfway between two of Americas […]

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05 March 2023 2:00 pm - 3:00 pm
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A Brief History of Model Railroading By Dave Albertson 2PM-3PM Hotel Lounge Tracing the roots of Model Railroading back to the 1890's. Manufacturers, Inventions and Pioneers of Model Railroading that […]

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26 March 2023 11:00 am - 4:00 pm

NJ Makers Day @InfoAge Join us to participate in the annual statewide celebration of making! A dozen free hands-on activities in our main building and much more to see and do […]

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26 March 2023 2:00 pm - 3:00 pm
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Sunday March 26th ISEC Lecture Series By Frank O'brien 2PM-3PM ISEC Center   About Frank O'Brien: Frank O'Brien is a volunteer historian for NASA as part of their history, education […]

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14 April 2023 April 14 - April 17
InfoAge Science & History Museums, 2201 Marconi Road
Wall, NJ 07719
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Vintage Computer Festival East 2023 April 14th- 16th 2023 Latest info is on the VCF Event Page The theme for the 2023 Festival is Computers in Education

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10 July 2023 July 10 - July 14
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WEEK 1: WONDER Young innovators will: • Build their own mini skate park with rad ramps, bowls, jumps and rails • Become event planners, invent a Party Assistant and design […]

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17 July 2023 July 17 - July 21
InfoAge Science & History Museums, 2201 Marconi Road
Wall, NJ 07719
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WEEK 2: FAST FORWARD Young innovators will: • Design dream homes, explore renewable energy sources and invent their own smart devices • Become robotic pet veterinarians as they take apart […]

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24 July 2023 July 24 - July 28
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A week of hands-on STEM and space activities at the historic InfoAge Science & History Museums Space Exploration Center July 24-28, 2023 9AM to 3PM Ages 11-14 $199 per child […]

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