Accession Number : AD0658374

Title :   MAGNETOSTRICTIVE DELAY LINE MEMORY FOR TRANSIT 4A,

Corporate Author : JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s) : Perschy,James A.

Report Date : 12 JUN 1961

Pagination or Media Count : 13

Abstract : The paper discusses the magnetostrictive delay line portion of the entire memory system. The decoder has as an input the video output of the command receiver. It is sensitive to an audio frequency tone. During the memory load, the first audio tone burst will cause the decoder to send a clear signal to the magnetostrictive delay line memory. At the termination of the first audio tone burst, the decoder will send a timing signal to the magnetostrictive delay line memory for the insertion of a timing marker into the memory. During the remaining load process an audio tone at the input to the decoder will be interpreted as a '1'. The absence of an audio tone will be interpreted as a zero. The timing marker inserted in the magnetostrictive delay line memory will re-appear every 2,048us to sample the output of the decoder until the memory is loaded. This system of loading the memory under control of the satellite timing circuitry requires that the transmission bit rate at the injection station be carefully synchronized with the memory data rate. The data readout rate from the memory is also under control of the satellite's stable oscillator and is not dependent on the exact delay period of the magnetostrictive lines.

Descriptors :   (*DELAY LINES, MAGNETOSTRICTIVE ELEMENTS), (*DATA STORAGE SYSTEMS, DELAY LINES), DATA TRANSMISSION SYSTEMS, LOGIC CIRCUITS, CIRCUITS, TIMING CIRCUITS, GATES(CIRCUITS), NAVIGATION SATELLITES

Subject Categories : Electrical and Electronic Equipment
      Computer Hardware
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE