# World Science and Technology – 154

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154. A given signal’s second harmonic is twice the given signal’s __________ frequency…?

(a) Fourier
(b) Foundation
(c) Fundamental
(d) Field

Explanation
Explanation : 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.
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