Vol. 1, No. 1 (September-October 1961)
This issue is part of the APL Technical Digest, published from 1961 to 1977.
Miscellany
In This Issue
Injun, A Radiation Research Satellite
The launching of the Transit 4A satellite on June 29, 1961, marked the first attempt to orbit three satellites simultaneously. The middle member of the three, Injun, is a radiation research satellite developed by Professor James A. Van Allen and his associates at the State University of Iowa. This paper describes Injun in some detail, especially the low-energy proton detectors developed for it at APL, and some preliminary conclusions drawn from the data already received from Injun.
New Trends in Telemetry
Telemetry systems in widest user are the FM-FM frequency division, and the PAM, PDM, and PCM time-division systems. A new hybrid system, PACM, could be used to combine the advantages of both PAM and PCM. In the future there will be marked improvement in speed, accuracy, and reliability of telemetry systems, along with reduction in size, weight, and cost.