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The purpose of the study is to investigate the tuning and modulation properties of transferred-electron devices. The device performance under two basic tuning methods was examined: tuning through the bias voltage of the device and tuning through a resonant circuit. The tuning properties were derived from the interaction between the device and the circuit. Thus, both the device and the circuit admittances are needed for the investigation. Two conventional cavity circuits which were employed in these investigations, namely, the post-mount waveguide cavity and the slug-tuned coaxial-line cavity, had already been modeled and well understood. This study, therefore, concentrated on the nonlinear properties of the transferred-electron device. (Author)

Contents: On the implementation of error correcting codes, Dual codes variable redundancy codes, Cyclic product codes with variable redundancy, On variable length codes as variable, redundancy codes, On detecting errors after correction, Mode control in communications systems using variable redundancy codes, and Bursterror cyclic codes generated from cyclic groups., See also Volume 4, AD0609472.

The objective of the study program is to pursue a continued research and development effort with the goal of increasing the capability of automated interference measurements in the frequency range of 100 kc to 40 gc. Investigation is being directed toward the design, on paper, of a single receiver having the combined capabilities of a spectrum signature, field surveillance, field intensity and other types of broadband receivers. During the course of this study pro gram, major emphasis will be placed on investigation of techniques in two specific areas: (1) voltage-tunable, solid-state receivers; and (2) automated techniques for the presentation. Where necessary, various techniques will be breadboarded for comparison or feasibility purposes. The program output will be a final report describing the relative merits of the techniques investigated. The design of a receiver utilizing the techniques which best fulfill the program goals will also be presented on paper. Field tests were run on the existing AN/GRR-9, a voltage-swept field surveillance receiver. The results of these field tests were applied as inputs to the present receiver study program.

ATE Device and Circuit Studies.Quarterly progress rept. no. 10, 1 Dec 72-1 Mar 73,10Haddad,G. I. ;Lomax,R. J. ;Tang,D. ;F30602-71-C-0099AF-5573557303RADCTR-73-157See also Quarterly progress rept. 8/9, AD-759 833.(*semiconductor devices, *microwave equipment), (*integrated circuits, microwave equipment), avalanche diodes, microwave amplifiers, microwave oscillators, field effect transistors, silicon, gallium arsenides, manufacturinggunn diodes, impatt diodes, avalanche diodesThe tenth quarterly report investigates theoretically and experimentally new solid-state phenomena and techniques having application to microwave generation, amplification, and control. Current tasks under this program are: Modulation properties of Gunn-effect devices, nonlinear operating characteristics of IMPATT diodes, high-efficiency avalanche diodes, properties of TRAPATT diodes, field-effect transistors, CW power capability of IMPATT devices, solid-state device fabrication., See also Quarterly progress rept. 8/9, AD-759 833.