Tape Playback and Serial-Time Decoder for IFF(Identification Friend or Foe) Flight Test Instrumentation

摘要

The tape playback and serial-time decoder described in the report has been developed for evaluating event data recorded on magnetic tape during flight tests of the Hartlobe/Diversity dual-antenna system for airborne IFF transponders. Means are provided to recover pulse-duration-modulated (PDM)-multiplexed data from five playback channels of the instrumentation tape recorder to provide ten data channels for 35-mm oscillographic film records. Also, a serial-time code from another playback channel is used to synchronize an internal clock to provide the capability to superimpose on the oscillographic film record the time of day that the flight test data were originally recorded. Though the internal clock is primarily intended for use with the magnetic tape playback, a means is also available for operation as a completely self-contained, crystal-controlled, electronic clock with serial and parallel output signals. (Author)