Some less than obvious specifics attributed to SDR (what is intermodulation, and why it’s bad, how to suppress a receiver by transmitting in the sideband frequency, as well as sensitivity and selectiveness of SDR). Modern types of modulation. Radio monitoring or a ways to detect frequency producing devices (specifics of detecting a signal using spectral analysers). What types of attacks use detectible radio systems, their special features, and what types of attacks are ineffective.