Tactical radios typically use frequency hopping in order to minimize interference and jamming threats. However, when a frequency hopping technique is applied, the radio may interfere with adjacent signal bands or inband communications technologies. It can also cause spurs due to transient and modulation errors, digital to RF coupling, nonlinear effects and power glitches, and timing errors. Because of this, it’s just as important to test radios when they’re in frequency hopping mode as it is to test them when they’re operating in a static mode. This application note explains the benefits of using a Rohde & Schwarz signal and spectrum analyzer (with realtime option) to enable wideband signal analysis and high probability of intercept in the testing of radios in a frequency hopping mode.