Communications

The most common technique used for coupling IF amplifiers

Type of coupling where the secondary voltage is relatively low and the bandwidth is narrow

Type of coupling which has a high gain and broad bandwidth

It is the point where the reflected resistance is equal to primary resistance and the Q of the primary tank circuit is halved and the bandwidth is doubled

It is caused by the reactive element of the reflected impedance being significant enough to change the resonant frequency of the primary tuned circuit

A type of detector that detects the shape of the input envelope

A section of an audio stage of a receiver that removes sporadic, high-amplitude noise transients of short duration, such as impulse noise.

A circuit that detects the occurence of a high-amplitude, short duration noise spike then mutes the receiver by shutting off a portion of the receiver of the duration of the pulse

With high-gain selective amplifiers that are stable and easily neutralized, what is the desired value of intermediate frequency?

It is defined as the ratio of the demodulated signal level at the output receiver to the RF signal level at the input to the receiver

A balanced modulator is sometimes called

The difference between the IF and the BFO frequencies is called

A system that provides narrowband voice communications for land mobile services with nearly the quality acheived with FM systems and do it using less than one-third the bandwidth

An SSB transmitter has an average output power equal to _______ of that PEP rating.

Noise interferes mainly with modulating signals that are

Which of the ff is true about the NE566 IC

Over a narrow range of frequencies, the PLL acts like a

The output of a PLL frequency demodulator is taken from the

It is also known as upward or downward modulation

Demodulating quadrature AM signal requires a carrier recovery circuit to reproduce the original carrier frequency and phase and two balanced modulators to actually demodulate the signals. This is called