Frequency multipliers Are used to multiply the frequency of the carrier signal of an FM signal consist of a class C amplifier followed by a tank circuit that filters out a single harms Are used to multiply the frequency deviation of an FM signal All the above Which of the following signals do not appear at the output of the mixer in fig.1. input signal audio signal local oscillator signal local oscillator signal plus input signal What is the purpose of the tuned circuit shown in fig.1? local oscillator amplify RF signals mix oscillator and input signals select desired signal and reject Solution 7) D 8) D 9) B 10) D.