In amplitude modulation, the amount of transmitter power increases as the modulation index

When the carrier is modulated 75%, the total power increases by what percentage over that of the carrier alone?

A sine wave carrier is modulated by a single tone so the Vmax = 18mV and Vmin = 10mV. Calculate the modulation index.

What is the 3rd character in the emission designation for telephony?

A still picture transmission using phase modulation.

A very small band of frequency that is used to protect interference of adjacent frequency.

In an FM transmitter, what is the result of overmodulation?

Calculate the deviation ratio for an FM signal where the maximum frequency deviation is 60kHz and the maximum modulating frequency is 5 kHz.

The maximum allowed deviation of the FM sound signal in TV is 25kHz. If the actual deviation is 20kHz, the percent modulation is

What is the amount of carrier swing necessary to produce 90% modulation for FM Broadcasting?

The deviation of the FM signal will depend on the _____ of the modulating signal.

A superheterodyne receiver is tuned to a frequency of 5MHz when the local oscillator frequency is 6.65 MHz. What is the IF?

Which of the following falls under the HF band of the radio spectrum?

In a transmitted AM wave, state where the information is contained.

If a 7-ampere carrier is modulated 100% by a sinusoidal tome, how much does the antenna current increase?

An AM signal with a maximum modulating signal frequency of 4.5kHz has a total bandwidth of

In a Narroband FM system, the deviation ratio is commonly ONE and the highest audio frequency is generally limited to

The local FM stereo rock station is at 96.5 MHz. What must be the local oscillator frequency?

The purpose of the balanced modulator is to eliminate the

He developed the third method in generating SSB.

First symbol in the designation of radio signals emission, which refers to use of an unmodulated carrier.

A process which occur in the transmitter part of the transceiver.

The modulation index in Phase Modulation is proportional to the

Which of the following refers to a double sideband full carrier?

Having an information signal change some characteristic of a carrier signal is called

Which of the following is not true about AM?

The opposite of modulation is

The circuit used to produced modulation is called a

A modulator circuit performs what mathematical operation on its two inputs?

The ratio of the peak modulating signal voltage to the peak carrier voltage is referred to as

If m is greater than 1, what happens?

For ideal AM, which of the following is true?

The outline of the peaks of a carrier has the shape of the modulating signal and is called the

Overmodulation occurs when

The values of Vmax and Vmin as read from an AM wave on an oscilloscope are 2.8 and 0.3. The percentage of modulation is

The new signals produced by modulation are called

A carrier of 880 kHz is modulated by a 3.5 kHz sine wave. The LSB and USB are, respectively,

A display of signal amplitude versus frequency is called the

Most of the power in an AM signal is the

An AM signal has a carrier power of 5 W. The percentage of modulation is 80 percent. The total sideband power is

For 100 percent modulation, what percentage of power is in each sideband?

An AM transmitter has a percentage of modulation of 88. The carrier power is 440 W. The power in one sideband is

An AM transmitter antenna current is measured with no modulation and found to be 2.6 A. With modulation, the current rises to 2.9 A. The percentage of modulation is

What is the carrier power in the problem above if the antenna resistance is 75 ohms?

In an AM signal, the transmitted information is contained within the

An AM signal without the carrier is called a(n)

What is the minimum AM signal needed to transmit information?

The main advantage of SSB over standard AM or DSB is

In SSB, which sideband is the best to use?

The typical audio modulating frequency range used in radio and telephone communications is

An AM signal with a maximum modulating signal frequency of 4.5 kHz has a total bandwidth of

Distortion of the modulating signal produces harmonics which cause an increase in the signal

The process of translating a signal, with or without modulation, to a higher or lower frequency for processing is called

Frequency translation is carried out by a circuit called a

An input signal of 1.8 MHz is mixed with a local oscillation of 5 MHz. A filter selects the difference signal. The output is

The output of an SSB transmitter with a 3.85 MHz carrier and a 1.5 kHz sine wave modulating tone is

An SSB transmitter produces a 400 V peak-to-peak signal across a 52 ohms antenna load. The PEP output is

The output power of an SSB transmitter is usually expressed in terms of

An SSB transmitter has a PEP rating of 1 kW. The average output power is in the range of

Amplitude modulation is the same as

In a diode modulator, the negative half of the AM wave is supplied by a(n)

Amplitude modulation can be produced by

Amplitude modulators that vary the carrier amplitude with the modulating signal by passing it through an attenuator work on the principle of

The circuit that recovers the original modulating information from an AM signal is known as a

The most commonly used amplitude demodulator is the

A circuit that generates the upper and lower sidebands but no carriers is called a(n)

The inputs to a balanced modulator are 1 Mhz and a carrier of 1.5 Mhz. The outputs are

A widely used balanced modulator is called the

In a diode ring modulator, the diodes act like

The output of a balanced modulator is

The most commonly used filter in SSB generators uses

The equivalent circuit of a quartz crystal is a

The amount of frequency deviation from the carrier center frequency in an FM transmitter is proportional to what characteristic of the modulating signal?

Both FM and PM are types of kind of modulation?

If the amplitude of the modulating signal decreases, the carrier deviation

On an FM signal, maximum deviation occurs at what point on the modulating signal?

In PM, a frequency shift occurs while what characteristic of the modulating signal is changing?

Maximum frequency deviation of a PM signal occurs at

In PM, carrier frequency deviation is not proportional to:

To compensate for increases in carrier frequency deviation with an increase in modulating signal frequency, what circuit is used between the modulating signal and the phase modulator?

The FM produced by PM is called

If the amplitude of the modulating signal applied to a phase modulator is constant, the output signal will be

A 100 MHz carrier is deviated 50 kHz by a 4 kHz signal. The modulation index is

The maximum deviation of an FM carrier is 2 kHz by a maximum modulating signal of 400 Hz. The deviation ratio is

A 70 kHz carrier has a frequency deviation of 4 kHz with a 1000 Hz signal. How many significant sideband pairs are produced?

An FM transmitter has a maximum deviation of 12 kHz and a maximum modulating frequency of 12 kHz. The bandwidth by Carson’s rule is

The maximum allowed deviation of the FM sound signal in TV is 25 kHz. If the actual deviation is 18 kHz, the percent modulation is

Which of the following is not a major benefit of FM over AM?

The primary disadvantage of FM is its

The receiver circuit that rids FM of noise is the

The phenomenon of a strong FM signal dominating a weaker signal on a common frequency is referred to as the

The AM signals generated at a low level may only be amplified by what type of amplifier?

Frequency modulation transmitters are more efficient because their power is increased by what type of amplifier

Pre-emphasis is compensated for at the receiver by

The cut-off frequency of pre-emphasis and de-emphasis circuits is

Which of the following circuits is not typically part of every radio transmitter?

Class C amplifiers are not used in which type of transmitter?

A circuit that isolates the carrier oscillator from load changes is called a

Which frequency demodulator is considered the best overall?