A bstract-Previous work m precision coaxial coonectors for air lines and improvement of coaxial cable conoectors is reviewed. The current philosophies and resulting Standards of the United States of America Standards Imtitpte's StIbcommittee a U . 2 and the Institute of Electrical and Electronics bgineed Subawmittee 011 Precision Coaxial Connectors are discussed. Techoiqws for improved VSWR measurements needed in the develop ment of precision coaxial coawctors are described. Applications, develop meat plans, and oresolved problem are mentiowd.

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This single-channel parallel IF substitution system performs attenuator calibrations in a stepped frequency mode to 110 dB through 1-18 GHz, with the accuracy of a fixed frequency system. Measurement time is reduced and operation is simplified by use of two digitally controlled, frequency-locked oscillators as signal source and local oscillator, a 30-MHz precision digital substitution standard and an adaptive bandwidth closed-loop substitution technique. Incident power and source impedance at the insertion point are established by a precision broad-band power splitter and a leveling loop using a barretter as the microwave detector. The load impedance is established by a low mismatch masking attenuator. Measurement sequences can be controlled manually or by a programmable calculator which processes the data. The IF substitution process when under calculator control is terminated when a signal buried in the noise is recovered and the servo-loop is balanced.

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