An experimental study of a quartz generator of the GK380-P-7VS-450M-3.3 s type was carried out.A description of the scheme and design is given. The results of the experiment are presented, including the frequency run-out, the frequency dependence on the supply voltage, and the output signal spectra for three different viewing bands. The following parameters of the output signal were obtained: the operating frequency of 450 MHz, the amplitude of the sinusoidal signal of 210 mV, the frequency run - out in 20 minutes of 550 Hz, frequency instability when the supply voltage changes 230 Hz, suppression of the second and third harmonics of at least 30 dB.
Keywords: quartz oscillator, frequency instability, frequency run-out, the amplitude of the sinusoidal signal, the spectrum of the output signal
Results of modeling and a pilot study of a low-pass filter with a cut-off frequency of 4 GHz are given. Modeling of the filter was carried out in MicrowaveOffice application program package. The experiment was made on the vector analyzer of RXA chains. Results of modeling and an experiment conform to the imposed requirements, namely: - cut-off frequency is 4 GHz; - losses in bandwidth no more than 3 dB; - an obstacle on the second harmonic of cut-off frequency not less than 60 dB; - wave resistance of an input and exit of 50 Ohms.
Keywords: low-pass filter; cut-off frequency; losses in bandwidth; losses in an obstacle band; modeling; experiment