C4FM

AcronymDefinition
C4FMConstant Envelope 4-Level Frequency Modulation
References in periodicals archive ?
The new capabilities also support the analysis of C4FM modulation as used in Project 25, an industry standard for the manufacturing of interoperable digital two-way wireless communications products, created to improve radio spectrum efficiency.
The 2975 quickly tests the transmitter performance of the radio in less than 20 seconds with quick visual indicators of power, frequency error and C4FM Error Vector Magnitude.