STUDY OF RECEIVER MIXER CHARACTERISTICS.
Quarterly rept. no. 3, 1 Dec 65-1 Mar 66,
GEORGIA INST OF TECH ATLANTA ENGINEERING EXPERIMENT STATION
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Spurious response formations in a 6AS6W pentode mixer and a 6C4 triode mixer were investigated for numerous ordered arrangements of mixer dc parameters, circuit configurations, and signal injection levels. Response levels were measured for different methods of signal and local oscillator injection, and for resistive and tuned load conditions. The results have demonstrated that changes in the mode of signal andor local oscillator injection, local oscillator level, mixer load conditions, or mixer dc voltages produce changes in response levels that would be difficult to predict. A spurious response prediction technique for diode mixers previously developed at Georgia Tech was investigated to determine if modifications and improvements could be made to reduce prediction errors, and if this technique could be successfully applied to other mixer types. The results of this study are presented in the form of prediction errors derived from the actual prediction of diode and pentagrid mixer data. Maximum-upper-bound prediction methods are discussed, and practical examples of possible techniques are presented. Author
- Electrical and Electronic Equipment