C4FM

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Acronym	Definition
C4FM	Constant Envelope 4-Level Frequency Modulation

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The speed of the spectrum analyzer has been improved as well, C4FM modulation fidelity improvements: The compatible four-level frequency modulation (C4FM) fidelity meter on the IFR 2975 now reports the frequency error and deviation at symbol time in addition to the modulation fidelity error. Aeroflex Releases Enhanced P25 Testing Features for the IFR 2975 ... by Business Wire 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. IFR Adds Remote Operation, Trunked Radio Testing and New Test ... by Business Wire 01 PPM), C4FM (APCO 25) modulation and C4FM modulation error vector meter. IFR Adds SmartNet and SmartZone Testing to 2975 Digital Radio Test ... by Business Wire			C3X C4 C4 ET C4/5 C4/I2 C4/IT C40 C4ADA C4B C4BF C4BP C4BPA C4C C4CC C4CG C4CM C4CR C4CY C4D C4DQ C4E C4EO C4F C4FAP C4FCM C4FM C4FMO C4G C4H C4H10 C4I C4I2 C4I2SR C4I2TSR C4IBC C4ID C4IEW C4IEW&S C4IEWS C4IEWS&IM C4IFTW C4IM C4IP2 C4IS C4ISA C4ISN C4ISP C4ISR C4ISRAF C4ISREW C4ISRT			C4/5 C4/I2 C4/IT C40 C4004 C40H56 Carotene C4ADA C4b C4BF C4BP C4BPA C4C C4CC C4CG C4CM C4CR C4CY C4D C4DQ C4E C4EO C4F C4FAP C4FCM C4FM C4FMO C4G C4H C4H10 C4I C4I Alerts Presentation Layer C4I Capability Improvement Plan C4I Common Extensions C4I Executive Advisory Board C4I Integration Support Activity C4I Knowledge Management Terminal C4I Maritime Extensions C4i2 C4I2SR C4I2TSR C4IBC C4ID C4IEW C4IEW&S C4IEWS C4IEWS&IM C4IFTW C4IM C4IP2

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