EXPERIMENTAL STUDY OF THE HETERODYNE MODULE
Abstract
Heterodynes are an integral part of any superheterodyne receiver. They determine the stability and accuracy of the receiver settings. The purpose of this work is to create a heterodyne module with improved electrical parameters, with small dimensions and weight. The object of research is a five-channel heterodyne of the centimeter wave range. Such a heterodyne can be used in a multi-channel superheterodyne signal detection receiver. An experimental study of two five-channel channels-the upper and lower frequency heterodyne tuning. The results are presented in the form of frequency run-out curves for half an hour of operation after switching on, as well as the spectra of output signals in the near and far zones. The functional diagram of the module, a brief description of the design and the experimental method are given. The design of the module has the overall dimensions of the case 170x20x40 mm, is standardized and allows you to integrate the module into various receivers. Each channel of the heterodyne module includes a voltage stabilizer, an autogenerator with a dielectric resonator, a power amplifier and a power control detector, and a power divider by two. As a result of the experiments, the following parameters were achieved: – operating frequencies of 9.25 and 16.25 GHz; – maximum output power in the absence of an amplifier of at least 2 mW; – the run-out frequency of 80 kHz to 9,25 GHz frequency; – run-on frequency 600 kHz for the frequency of 16.25 GHz; – supply voltage + 15 V; – spectral line width no more than 5 kHz; –second harmonic suppression of at least 25 dB; – there is an on / off switch for each channel of the heterodyne module and built-in health monitoring.
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