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In a CW transmitter the best stage to key is:
the oscillator
the stage following the oscillator
the power amplifier
the low pass filter
The function of a transmitter low pass filter is:
To remove harmonics and spurious emissions below the cut off frequency of the filter
To help match the output impedance to that of the antenna
To remove key clicks from a CW transmitter
To remove harmonics and spurious emissions above the cut off frequency of the filter
To produce frequency modulation in a transmitter
Audio is applied to the PA stage
Audio is applied to the oscillator
Audio is applied to the low pass filter
Audio is applied to the antenna
In an SSB transmitter RF and an audio signal are fed into:
the balanced mixer
the audio amplifier
the final amplifier
the low pass filter
In a variable frequency oscillator, the frequency is determined by:
the type of transistor used
the value of the bias resistors
the value of the inductance and capacitance used
the value of the capacitor connecting the VFO to the buffer stage