(a)   transmitters require only a few watts of power for transmission.

In (a)   transmitters, both carrier and modulating signals are amplified before modulation.

The (a)   amplifier matches the output impedance of the carrier oscillator.

A (a)   amplifier is used to amplify the carrier signal in high-level transmitters.

In the audio chain, the (a)   converts voice signals into electrical signals.

The (a)   amplifier is used to modulate the combined carrier and audio signals in high-level transmitters.

In a low-level AM transmitter, the (a)   class amplifier performs amplitude modulation directly.

The (a)   transmits the modulated signal as electromagnetic waves.

A (a)   amplifier is used in an AM collector modulator.

(a)   current pulses in a Class C amplifier cause oscillation at the desired frequency.

A (a)   modulator generates a DSB-SC wave by suppressing the carrier signal.

Another name for a balanced modulator is a (a)   modulator.

A diode balanced modulator produces a (a)   signal at its output.

FM transmitters operate in the VHF band of (a)   MHz.

In the Armstrong method, FM wave generation is done in (a)   steps.

The (a)   oscillator is used to generate a highly stable NBFM signal.

In the audio chain, the (a)   boosts low modulating frequencies before applying them to the balanced modulator.

The (a)   modulator in the Armstrong method produces two sidebands that are 90° phase-shifted.

The (a)   network combines the unmodulated carrier with the 90° phase-shifted sidebands to create an NBFM signal.

The (a)   of multipliers in the Armstrong method is used to increase carrier frequency and modulation index.

The (a)   raises the carrier frequency further after the first group of multipliers.

Pre-emphasis boosts the (a)   of higher frequency modulating signals to improve noise immunity.

The pre-emphasis circuit acts as a high-pass (a)   filter, providing increasing gain for higher frequencies.

The process of artificially boosting higher modulating frequencies before transmission is called (a)   .

The process of reducing the amplitude of higher frequency components after demodulation is called (a)   .

The (a)   circuit in the FM receiver returns the message signal's frequency response to normal after demodulation.

The de-emphasis circuit behaves as a (a)   at higher frequencies, similar to a low-pass filter.

De-emphasis provides a (a)   gain at lower frequencies, maintaining signal quality after demodulation.