NAVAL AIR DEVELOPMENT CENTER WARMINSTERPA AERONAUTICAL ELECTRONIC AND ELECTRICAL LAB
A study was initiated to develop frequency synthesizer to replace present day spectrum generators. The design objectives were to minimize spurious signal outputs, eliminate mechanical components, and to incorporate electronic circuitry compatible with micro-miniaturization techniques. A method of frequency control was developed, using counters and logic circuits to develop a highly accurate coded error to connect to a variable frequency oscillator. A breadboard model was constructed, which was capable of pre selecting any discrete frequency within the range from 2.0 to 3.0 mc with a theoretical accuracy of plus or minus 1 count. The frequency control techniques generate an output signal from a single vfo which minimizes the generation of spurious outputs. By changing only the vfo and mixer stages, these frequency control systems are capable of providing a standard by which it is possible to obtain a band of discrete frequencies over the entire r-f spectrum.