Signal Verification RFeye® software includes an optional Signal Verification module that is used to test and verify that signals in channels (e.g. TETRA, DAB, GSM) are of the type authorized for those frequency bands. The software displays alerts for any transmissions that are not of the allowed or expected type within the channels. Results are displayed on a colour-coded spectrum (see above). Not only does this allow detection of incorrect signal types, but also less obvious infringements such as incorrect guard band ratios and symbol durations. Applications include regulatory and enforcement as well as verifying that a user’s own transmitter equipment is functioning correctly.