# RTTSS: the passage of signals along the radio path

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Term paper on RTTSS: Calculation of the passage of signals along the transmitting and receiving paths

Year: 2010

Assignment: Coursework consists of three assignments.
In fig. Figure 1 shows a block diagram of a superheterodyne receiver of amplitude-modulated signals. A radio pulse with a rectangular envelope arrives at the input of the receiver at time t = 0.
1. Briefly describe the purpose of the given receiver units.
2. Calculate and plot the spectrogram of the input signal module.
3. Select the frequency of the local oscillator.
4. Draw a schematic diagram of an intermediate frequency amplifier (IFA), assuming that it is implemented as a single-stage resonant transistor amplifier. Calculate circuit elements, time constant, resonant resistance, passband, gain at the resonant frequency and the amplitude-frequency characteristic (AFC) of the amplifier.
5. High quality, in compliance with the frequency scale, spectrogram of the current flowing through the nonlinear element of the frequency converter. In the same figure (under the spectrogram of the current, observing the same frequency scale) depict the calculated frequency response of the inverter.
6. Write down the expression for the signal at the output of the IF amplifier (t), assuming that the IF amplifier is tuned exactly to the intermediate frequency, and the transmission coefficient of the frequency converter is equal to one. Estimate the settling time of the envelope of the output signal.
7. Draw a schematic diagram of a diode amplitude detector connected to the amplifier circuit through a transformer. Calculate detector low pass filter elements and detector gain. Write the expression for the voltage at the output of the detector, considering the transfer coefficient of the transformer equal to unity.
8. To depict in one figure the input signal a (t), the signal at the output of the IF amplifier (t) and the signal at the output of the amplitude detector uout (t).

In fig. 2 shows a structural diagram of a radio transmitting device.
1. Briefly describe the purpose of the given blocks of the radio transmitter.
2. To formulate the basic requirements for the master oscillator.
3. Select the cutoff angle of the frequency multiplier.
4. Determine the width of the spectrum of the radio signal at the output of the modulator. Based on this, choose the equivalent quality factor of the circuit of a nonlinear resonant amplifier.
5. Give a diagram of a nonlinear resonant power amplifier on transistors and carry out its calculation. In this case, determine:
a) current cutoff angle (set);
b) gain;
c) stress bias based on U0;
d) the amplitudes of the 1st, 2nd and 3rd harmonics of the voltage across the collector (in the absence of a modulating signal);
d) the coefficient of nonlinear distortion Kg;
e) amplifier efficiency;
g) circuit parameters;
h) supply voltage.
6. To depict in one figure the current-voltage characteristic of the transistor used in the amplifier, the input signal; collector current of the transistor; collector voltage in modulation mode.

Synthesize a matched filter for a given signal.
1. Determine the complex filter gain.
2. Synthesize the structural diagram of the filter.
3. Define and build a timing chart of the output signal (under the timing chart of the input signal).
4. Estimate the signal-to-noise ratio at the filter output as a function of n.
Type of signal: Coherent burst of n radio pulses with a rectangular envelope and a duty cycle equal to Q.

Scope of work:
* Explanatory note with the necessary calculations, figures, graphs; number of pages: 37, MS Word

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