Electronic Instrumentation for the Study of Air-to-Air Electromagnetic Wave Propagation at 250, 1000 and 3000 MC

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Report Number: WADC TR 52-268
Author(s): White, Stanley B.
Corporate Author(s): Aircraft Radiation Laboratory
Laboratory: Aircraft Radiation Laboratory
Date of Publication: 1952-08
Pages: 53
DoD Task:
Identifier: AD0004089
AD Number: 4089

Abstract:
Electric instrumentation was developed for air-to-air propagation on measurements at 250-, 1000-, and 3000-mc ranges. A square-wave-modulated crystal-controlled transmitter for 245 and 1000 mc was used with an 18-c- bandwidth filter-amplifier and an APR-4 receiver, while a peak reader with an internally generated carrier was used with the receiver for short-pulse modulation measurements at 256, 2880, and 3295 mc. The rectified output from either the filter-amplifier or peak reader operated a recorder which continuously recorded the received signal on an approximately logarithmic scale. The receiving system using square-wave modulation detected and recorded 107-dbm signals and had a dynamic range of well over 100 db. The short-pulse receiving system detected and recorded signals down to the noise level of the receiver, and had a dynamic range of over 85 db. The 2 systems operated satisfactory with existing radio and radar equipment.

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