Symposium And Educational Workshop

using satellites to teach other subjects such as physics, geography, computers, language arts, etc.; ways to use satellites in grades kindergarten through college; designing a school science room including Amateur Radio and satellites; and, how to use satelites as a drawing card for recruiting new hams. The deadline for submission pf papers is the same as above.

Papers submitted by the deadline will appear in printed proceedings which will be available at the Workshop and Symposium, and can be purchased by mail from either AMSAT-NA or ARRL.

For author's kit or further information, please contact Lori Weinberg at ARRL HQ, telephone 1 203 666-1541 or fax 1 203 665-7531.

September 1991 7

Measuring the Mass of the Earth: The Ultimate Moonbounce Experiment

By H. Paul Shuch, N6TX Professor of Electronics Pennsylvania College of Technology One College Avenue Williamsport, PA 17701

Abstract

Radio amateurs have been successfully bouncing VHF, UHF and microwave signals off the surface of the moon, and receiving their echoes, for nearly forty years. EME (Earth-moon-Earth) activities have enhanced the teaching of disciplines as diverse as electronics, astronomy, and physics, with several generations of students having now used measured echoes to determine the distance to, and orbital parameters of, the moon. Penn College students have recently had an opportunity to apply these measurements on a truly grand scale, using EME signals to measure the mass of the Earth. Their results differ from the currently accepted figure by about one percent.

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