# Chains and telecommunication signals, version 10 (k / p №1)

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# Description

Objective 1
The serial circuit connected to a generator.
Fig. 1.1
1.Rasschitayte frequency resonant circuit f0, reactance and X0L X0C, characteristic impedance circuit Z0, quality factor, attenuation of the voltages on the coil and a capacitor, the input impedance of the circuit at resonance, the current amplitude at a resonance, and generalized relative detuning, bandwidth circuit .
Initial data:
L = 2.5 mH C = 55 pF R = 13 ohms Em = 9 B Δw = 130 rad / c
2.Postroyte dependence of the output voltage from the generalized detuning.
3.Poyasnite what is the phenomenon of resonance.
4. What methods can achieve resonance in the circuit?
5. What are the physical meaning of the concept of selectivity?

1. In a parallel oscillating circuit included EMF with internal resistance Ri. There are L, C and R. necessary to calculate the resonant frequency, quality factor, the input impedance at resonance, the input loop current and the currents in the branches at resonance, active and reactive power fluctuations.
Initial data:
260mkGn L = C = 160pF \u200b\u200bR = 24Om 32kOm Ri = E = 85C
2.Poyasnite, what is the essence of the current resonance.
3.Privedite comparison of serial and parallel circuits for their input impedance.

Objective 3
1.Rasschitayte cut-off frequency and frequency response of the active RC-filter. Explain the essence of the work of the active RC-filters.
Initial data:
The type of filter - LPF, R1 = 6.8kOm, C1 = 1.6nF
2.Rasschitayte elements LC filter. Build dependency characteristic impedance of the frequency bandwidth of the filter.

1.Dayte definition of "long line".
2.Privedite equivalent circuit of 1 km long line.
3. Define the running, and standing waves in the mixed line.
4. Calculate the reflection coefficient, the coefficients of traveling and standing waves, the input impedance of line segments of length a multiple quarter wavelength of the emitted power in the line.
Draw graphs of voltage and current along the length of the line.
Initial data:
Zl = 3500 ohms, Zv = 3200 ohms, Pmax = 18 mW
5.Poyasnite how to reconcile the two lines with different wave resistances.