TELEMETRY TAPE COMBINER SYSTEM.
Final rept., Oct 62-May 66,
SICHAK ASSOCIATES NUTLEY N J
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The report covers the study, investigation and experimentation performed in Phases I and II of the Telemetry Tape Combiner program. The objective of the contract Phases I and II was a breadboard demonstration of suitable techniques for optimally combining several telemetry tape recordings into one. The important problem areas in the development had to do with slaving together the separately recorded wideband signals with sufficient accuracy and speed of response to maintain coherent addition despite rapidly fluctuating errors in relative timing. Most of the effort in Phase I was devoted to the fundamental problem of time delay correction. Four different solutions 2 digital, 2 analog were investigated and compared, with preference being given to a system of binary switching of fixed delay lines for further development in Phase II. A portable tape recorder test set was developed and used to obtain experimental values of time delay errors introduced by typical tape machines at the Air Force Eastern Test Range. For Phase II an 800 microsecond 1.5 mc bandwidth variable delay line was constructed and two-reproducer predetection tape combiner breadboard was assembled. The delay line range, speed of response and bandwidth were adequate. The delay line initially used an amplitude modulated carrier and excessive transient noise was produced. When the delay line was rebuilt using an FM carrier system satisfactory performance was achieved. Various test signals were successfully combined. A recommended plan for an operational combiner is presented. Author