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Analyzer of spectrumSpectrum analyzers are tools used to measure the periodic waveform spectrum. A superheterodyne receptor is the most frequent form of spectrum analyzer. A Fast Fourier Transform(FFT) spectrum analyzer is another sort of spectrum analyzer that is becoming popular.Spectrum analyzers are used to indicate in the frequency domain the frequency and amplitude ofthe signals. Efficient information transmission is achieved by a process called as modulation.This approach changes the normally low frequency information transmission to a higherfrequency by the use of a third, modulating signal. But why do the original signal modulate? Thefirst two arguments are:(1) modulation methods enable simultaneous transmission to a higher frequency and carrier oftwo or more low frequency or base band signals.2) Small physical-size high-frequency antennas are more electrically efficient. In this section,three common modulation formats are considered:• Modulation of amplitude or AM.• Modulation of frequency or FM.• Modulation of the pulses or PM.Spectrum Analyzer WorkThe difference frequency is really the frequency of interest in a spectrum analyzer. The mixerchanged our RF input to an IF (Intermediate Frequency) signals, which can now be filtered,amplified and detected by the analyzer to show the signal on the screen.
Ways to analyses modulated signalThe spectrum analyzer output is an X-Y track on the display, so let's examine what informationwe obtain from that. The display is mapped to a grid with 10 main horizontal divisions and 10main vertical divisions in general. In frequency that goes from left to right, the horizontal axis islinearly calibrated. Frequency setting is a two-step procedure. We first alter the centerlinefrequency of the graph using the center frequency slider. Then we modify the frequency range(range) throughout the 10 divisions by controlling the frequency range. These settings areseparate, so we don't change the frequency range if we change the central frequency.Alternatively, instead of selecting center frequency, we may specify the start and stopfrequencies. In each situation, the absolute frequency of each signal presented and the relativefrequency difference between any two signals may be determined.The following details have been provided for FM calculationsi-eFrequency = 35.14 MHzStrip width = 10 kHzModule = DRMWhen there is an interfering system, the quantity of interfering power must be known. Thesystem may function correctly or not depending on the interfering power level. In addition, if thelevel of interference power is high enough to reduce the quality of the system underinvestigation, knowledge of the amount of interference is important in order to develop a suitablesolution. In the spectrum assigned to the DRM service (Digital Radio Mondiale).