SATELLITE-TRACKING RADAR by

The radar employed at the Bell Telephone Labora-tories ' Holmdel, New Jersey site for tracking the Echo I satellite was originally designed for the sole purpose of an-tenna pointing. Recently, however, it has also been em-ployed to measure earth-balloon-earth path loss at regular intervals of time in order to ascertain the balloon's con-dition. The performance of the system and some of the data obtained are discussed. PRE FACE The Project Echo communications experiment was a joint operation by the Goddard Space Flight Center of th