Research into electronic hardware stable operation as regards aggressive external electromagnetic environment becomes an ever more acute problem for various reasons. One of the most important reasons is a growing sophistication of the electromagnetic environment accounted for by increasing numbers of receiver-transmitter microwave devices of diverse kinds, progress in ultra-high power pulsed electromagnetic generators and appearance on the electromagnetic scene of novel ultra-short impulse generators. In this connection, an experimental research is most welcome on unstable chaotic states, excited in real electronic devices under the action of external pulsed signals. Out of an exceptionally broad class of electronic devices to be taken for study, receiver-amplifier sections (RAS) provoke the keenest interest.