DECIMETER RANGE GENERATOR

Abstract

The receiver's heterodyne and the transmitter's master oscillator are the most important components, as they determine their stability and range properties. In recent years, the Meteor plant has created a number of new voltage-controlled generator chips with high electrical parameters. However, the advertising materials of this company do not contain a number of parameters that are important from the point of view of the consumer. Therefore, the purpose of this work is to study the main characteristics of the generator, including those not declared by the supplier: the width of the signal spectrum, the average steepness of the modulation characteristic, the level of harmonics. The object of the study is the GUN382 microchip in a typical switching circuit. The results of an experimental study of a VCO operating in the 1200 MHz region are presented. The estimation of parasitic products in the spectrum of the output signal is given. Photos of the spectrum of the output signal showing a small width of the spectral line are presented. The modulation characteristics are measured when the control voltage and supply voltage change, and their average steepness is calculated. These data allow us to make reasonable requirements for the stability of the control and supply voltages. The results obtained can be used in receiving and transmitting equipment for communication, navigation, and electronic warfare. The article expands the idea of the line of generators of the Meteor plant, demonstrates their high electrical characteristics: operating frequency range 1200 ± 16 MHz; output power of at least 1 dBm; supply voltage + 5V; control voltage from 0 to 8 V; the level of the second and third harmonics does not exceed minus 22 dB in relation to the useful signal.