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In a simple 2 stage CW transmitter, current to the collector of the transistor in the class C amplifier stage flows through a radio frequency choke (RFC) and a tapped inductor. The RFC, on the tapped inductor side, is also connected to grounded capacitors. The purpose of the RFC and capacitors is to:
form a low-pass filter
The RFC provides DC path and RF isolation. The tapped inductor and associated capacitors often form a Pi-network or L-network output filter, which acts as a low-pass filter to attenuate harmonics before the antenna.
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