Accession Number : AD0282960

Title :   RECOVERY OF INFORMATION TRANSFERRED INTO PHASE MODULATION IN IONOSPHERIC WAVE PATHS

Corporate Author : PISA UNIV (ITALY)

Personal Author(s) : MANCIANTI,MARIO ; MARCHETTI,GIOVANNI

Report Date : FEB 1962

Pagination or Media Count : 1

Abstract : Recovery of the information which though originally impressed onto a signal as amplitude modulation, has been changed to phase modulation by travelling through the ionosphere, was studied. The possibility of an at least partial recovery of the information changed to phase modulation, by means of a double homodyne detector was studied. On the basis of theory, an experimental device which was developed is described, and some of the results obtained are given. With a view to checking its performance, an ionospheric simulator was constructed. This is capable of supplying altered waves, similar to those subject to multiple paths or to sideband rotations. The working principle and circuit diagrams are given, as well as a block diagram of a new device for the recovery of information, which seems to have some advantages over the one already constructed. (Author)

Descriptors :   *IONOSPHERIC PROPAGATION, *PHASE MODULATION, *RADIO WAVES, CIRCUITS, RADIO RECEIVERS, RADIO SIGNALS, RADIO TRANSMISSION, RECOVERY

Distribution Statement : APPROVED FOR PUBLIC RELEASE