The yellow trace is the baseline system noise. An example spectral plot from 9 kHz to 200 MHz of narrow band harmonics (vertical spikes) riding on top of broadband interference (broad area of increased noise floor). Power line noise or switch-mode power supplies are the most common sources.įigure 1. On a spectrum analyzer, this would appear to be broad ranges of signals or an increase in the noise floor. On a spectrum analyzer, this would appear to be narrow vertical lines or slightly wider modulated vertical bands associated with specific frequencies.īroadband – this would primarily include switch-mode power supply harmonics, arcing in overhead power lines (power line noise), wireless digitally-modulated systems (such as Wi-Fi or Bluetooth), or digital television. Examples might include clock harmonics from digital devices, co-channel transmissions, adjacent-channel transmissions, intermodulation products, etc. ![]() Narrow Band – this would include continuous wave (CW) or modulated CW signals. There are two broad categories of interference narrow band and broadband ( Figure 1). ![]() This article explains how to identify, characterize, and locate typical interfering sources. With the plethora of wireless devices, increasing broadcast, communications, and other RF sources all competing for radio spectrum, the chances of radio frequency interference (RFI) will only increase.
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