The Interference and Direction Analyzer IDA 2 from Narda Safety Test Solutions now generates persistence spectrums. Interference hidden beneath strong signals can now be detected and traced on the spot. Sources of electromagnetic radiation that interfere with radio or wireless communications can be difficult to localize if they are swamped by the regular signals. The interference is hidden beneath the useful signal when subjected to conventional spectrum analysis.
For this reason, the supplier has now equipped the interference and direction analyzer with a Persistence Spectrum display mode, which shows the changing useful signals and the underlying interference signals at the same time. For example, interference beneath GSM downlink signals with their changing channel allocations or hidden under a DAB channel can be seen because it leaves traces in the persistence spectrum in the modulation gaps that correspond to the "null" symbols. The device captures persistence spectrums with a usable bandwidth of up to 22 MHz. Various triggers can be set in order to capture brief events. Even unknown interferers can be "nailed", thanks to the resolution bandwidth (RBW) down to 0.1 Hz, and time resolution as fine as 1 µs as well as the display of level characteristics versus time at up to 32 ns resolution.