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Simply because any non sinusoidal signal is broadened in frequency domain and attain larger bandwidth than needed. In addition such carriers would create high level harmincs that interfere with other frequencies.
hey there, i'm using a vhf modulator that give the rf output with 75-ohm, i connected it to an amplifier of 50-ohm input impedance. Is the impedance in this situation matched? if not how can i match this network?
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