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R_C_COUPLED_BASE_MODULATION

2014-11-02 08:36  
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R_C_COUPLED_BASE_MODULATION
Modulation signal is injected by using two resistors, volues of which are determined by available r-f drive power; higher power is needed for larger resistance values. Excellent linearization of waveform is obtained with Re from 10 to 30 ohms. Rb should be in range from 100 to 2,000 ohms, with 470 as good com promise value. Modulation of 100% is easily achieved for CB transmitter.-B. Rheinfelder, Modulation Techniques for Transistorized A-M Transmitters, EEE, 11:7, p 54-57.