Q20
A given signal's second harmonic is twice the given signal's __________ frequency?
A.
Fourier
B.
Foundation
C.
Fundamental
AnswerD.
Field
Answer: Option C
Solution
Answer: Option C
Solution:
A given signal's second harmonic is twice the given signal's fundamental frequency. Harmonics are generated when there are non-linearities in an amplifier (there are always non-linearities). The worse the non-linearities, the more harmonics. A signal at 27.5 MHz (approximate frequency for US citizen's band) would have a second harmonic at 55.0 MHz (on US channel 2!). Can you see why there might be problems? A CB operator might do well to place a low-pass filter on his radio.