Amateur Extra › E8 Signals and Emissions › E8B06
E8B06
What is the deviation ratio of an FM phone signal having a maximum frequency swing of plus or minus 7.5 kHz if the highest modulation frequency is 3.5 kHz?
Pick an answer to check it.
Answer: A. 2.14
Deviation ratio = maximum deviation / highest modulating frequency = 7.5 kHz / 3.5 kHz = 2.14.
Tip: 7.5 / 3.5 = 2.14.