Resolving Signals of Equal Amplitude on Spectrum Analyzer

Chapter Resolving Signals of Equal Amplitude

Measurement Guide and Programming Manual For Spectrum Analyzers PSA and ESA Series
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Measurement Guide and Programming Manual For Spectrum Analyzers PSA and ESA Series

  • Chapter 217Measuring Multiple SignalsResolving Signals of Equal AmplitudeMeasuring Multiple SignalsResolving Signals of Equal AmplitudeIn this procedure a decrease in resolution bandwidth is used in combination with a decrease in video bandwidth to resolve two signals of equal amplitude with a frequency separation of 100 kHz. Notice that the final RBW selection to resolve the signals is the same width as the signal separation while the VBW is slightly narrower than the RBW.Step 1.Connect two sources to the analyzer input as shown in 17,Figure 17,2-6.Figure 2-6Setup for Obtaining Two SignalsStep 2.Set one source to 300 MHz. Set the frequency of the other source to 300.1 MHz. Set both source amplitudes to −20 dBm. The amplitude of both signals should be approximately −20 dBm at the output of the bridge. Step 3.Setup the analyzer to view the signals:Press Preset, Factory Preset (if present).Press FREQUENCY Channel, Center Freq, 300, MHz.Press BW/Avg, Res BW, 300, kHz.Press SPAN X Scale, Span, 2, MHz.A single signal peak is visible. See 18,Figure 18,2-7 18, for an ESA example.NOTEIf the signal peak is not present on the display, span out to 20 MHz, turn signal tracking on, span back to 2 MHz and turn signal tracking off.:Press SPAN, Span, 20, MHz.Press Peak Search, FREQUENCY, Signal Track (On).Press SPAN, 2, MHz.Press FREQUENCY, Signal Track (Off)