Signals can be hidden by various means, including placing them next to a large signal or using spread spectrum technology to create low probability of detection (LPOD) signals. The development of various digital modulation formats has provided a new means for signals to be hidden in plain sight. To confirm that a signal is actually what it appears to be requires more than measuring its shape and bandwidth, but also demodulating the signal. These measurements are easily done with an antenna attached to a handheld signal analyzer such as Anritsu’s BTS Master or Spectrum Master.
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Free application note "Detecting Signals Hidden in Plain Sight"