A method has been developed for suppressing parasitic oscillation of transistors operating under test conditions through the use of ferrite cores and capacitors. The Hewlett-Packard Model 8554L spectrum analyzer is recommended for detecting unknown rf noise.

Mass anodization of tantalum-nitride films with sheet resistivities not exceeding 200 ohms per square to meet ±10-percent tolerance requirements on resistors above 100 ohms has been shown feasible. The anodization system that was developed for this study is capable of producing yields of approximately 80 percent under those conditiohs. Although anodization trimming on films with sheet resistivities as high as 600 ohms per square is now feasible, further work is necessary to successfully anodize films above 600 ohms per square and resistors below 100 ohms.

This work resulted in development of the necessary techniques to automatically measure radar receiver and system sensitivity. Both measurement speed and repeatability are improved over that possible by manual methods. Combined logic and analog techniques were used to derive a system suitable for both in-process and final-assembly tests on radar systems and rf subassemblies.

The feasibility of using EN-7 as a substitute for Adiprene L100 curing agent for analyzer encapsulation was investigated. Since many analyzer assemblies cannot tolerate the usual EN-7 cure temperatures, this investigation was limited to a maximum cure temperatureof 710°C. The results of these tests indicate that a 20-hour cure at 490°C is adequate to provide sufficient hardness if followed by additional room-temperature cure.

The mechanical, electrical, and thermal properties of a general purpose epoxy potting compound, filled with either glass microspheres or aluminum oxide and catalyzed with either diethanolamine or Epon Z are discussed. Twelve formulation-cure cycle combinations were chosen for evaluation. The temperature properties from -65 to 400°F (-54 to 204°C) of four of the combinations are given. Modulus versus temperature polynomials were calculated for the diethanolamine catalyzed material.