In article a modelling and experimental survey of the controlled attenuator in a frequency range 2 - 4 GHz is performed. It is received the minimum attenuation no more than 3.5 dB, the maximum attenuation not less than 56 dB at a current 3.8 mA. The amplitude-frequency characteristic unevenness at a current 3.8 mA does not exceed 3 dB. The attenuator design is made in the form of the hybrid module. The attenuator is intended for adjustment of transfer constant of the microwave receiver.

Keywords: attenuator, pin-diode, amplitude-frequency characteristic, control current

The frequency divider for 32, operating in a range of frequencies 8-18 GHz is considered. The specifics of the schematic diagram is shown. The design and element base is described in short. The model is made and its experimental research is carried out. The technique and the block diagram of the experiment is described. Level of harmonics of an output signal is measured. For decrease of level of harmonics of the useful signal the low-pass filter of type SALF-580 is used. Presence of a parasitic output signal in the absence of an input signal is revelead.

Keywords: frequency divider, microcircuit, experiment, amplitude-frequency characteristic, low-pass filter

The experimental research of amplitude characteristics of low-noise amplifiers of microwave range of АС180400-071 type of Joint-Stock Company "SKARD-ELEKTRONIKS" manufacture was made. It is shown, that power of saturation can vary from 34 to 75 mW at input power 10 mW. On a number of frequencies monotony of the amplitude characteristic is not provided.

Keywords: limiting amplifier, power of saturation, measurement installation, amplitude characteristic

The frequency divider for 8, operating in a range of input frequencies 8-18 GHz is considered. The function diagram is shown. The design and element base is described in short. The model and its experimental research is made. The technique and the block diagram of the experiment is described. Frequency dependence of transmission coefficient is measured. It is shown, that the frequency divider together with the two-cascade limiting amplifier has sensitivity minus 75 dBW, transmission coefficient is about 40 dB and nonuniformity of transmission coefficient is 1.64 dB. Level of the second and third harmonic of output signal is measured.

Keywords: frequency divider, centimeter waves, microcircuit, experiment, amplitude-frequency characteristic