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C4FM

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AcronymDefinition
C4FMConstant Envelope 4-Level Frequency Modulation


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? References in periodicals archive
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
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