RHM 1 ESAT PART 4

A TV signal consists of an audio signal that is

According to the International Telecommunications Union an amplitude-modulated analog TV would be classified as

What kind of antenna feed line is made of two conductors held apart by insulated rods?

Indicate the false statement. The superheterodyne receiver replaced the TRF receiver because the latter suffered from

What does the term "balun" mean?

Where would you install a balun to feed a dipole antenna with 50-ohm coaxial cable?

Which of the following is not an important transmission line specification?

Energy that is reflected from the end of an improperly terminated line back up the line towards the generator is called a

What is an unbalanced line?

Indicate which of the following circuits could not demodulate SSB:

What is the best antenna feed line to use, if it must be put near grounded metal objects?

Which of the following is not found on the linear scales printed at the bottom of Smith charts?

The ideal standing wave ratio is

One of the main functions of the RF amplifier in a superheterodyne receiver is to

Which of the following equipment is not required to make receiver sensitivity and noise measurements?

To determine the noise level when the horizontal spacing on the oscilloscope and the vertical sensitivity are known, multiply the horizontal spacing by the sensitivity and

If a FET is used as the first AF amplifier in a transistor receiver, this will have the effect of

What is the name of the test that determines whether a cell phone will filter out large nearby signals that can be mistakenly interpreted as its receiving frequency?

The circuit shows two resistors in series at two different temperatures. Find the total noise voltage and noise power produced at the load over a bandwidth of 100 kHz. (T1 = 300K, R1 = 100Ω, T2 = 400K, R2 = 200Ω)

What are some reasons not to use parallel-conductor feed line?

What common connector usually joins RG-213 coaxial cable to an HF transceiver?

An essential oscilloscope like device with a CRT display and built-in microcomputer for fiber-optic work is the

Which of the following is not a common problem in communication equipment?

What common connector usually joins a hand-held transceiver to its antenna?

One of the following types of noise becomes of great importance at high frequencies. It is the

Why should you use only good quality coaxial cable and connectors for a UHF antenna system?

Variable-frequency generators that provide the frequency stability of crystal oscillators along with incremental tuning are called

A satellite receiving system includes a dish antenna (Teq=35K) connected via a coupling network (Teq=40K) to a microwave receiver (Teq=52K referred to its input). What is the noise power to the receiver’s input over a 1-MHz frequency range? Determine the receiver's NF.

A circuit whose output frequency is some integer submultiple of the input frequency is a(n)

What are some reasons to use parallelconductor feed line?

If your transmitter and antenna are 15 metres apart, but are connected by 65 metres of RG-58 coaxial cable, what should be done to reduce feed line loss?

A troubleshooting technique where an oscilloscope or other signal detection device to follow a signal through the various stages of the equipment is called

A parallel LC tank circuit is made up of an induction of 3 mH and a winding resistance of 2 Ω. The capacitor is 0.47 μF. Determine fr and Q.

What is the method used to provide a way to observe test points inside a chip that are not normally accessible and to observe signals at IC pins inaccessible because of their surface mounting?

As the length of a feed line is changed, what happens to signal loss?

What is an excellent way to get a nonprecise, quick, qualitative check of a signal?

A device that produces fixed binary bit patterns in serial form to use as test signals in data communication systems is a

As the frequency of a signal is changed, what happens to signal loss in a feed line?

Which of the following is not an advantage of using a differential amplifier as an amplitude modulator?

Losses occurring on a transmission line between transmitter and antenna results in:

In a communications system, noise is most likely to affect the signal

A phase-locked loop has a VCO with a free-running frequency of 12 MHz. As the frequency of the reference input is gradually raised from zero, the loop locks at 10 MHz and comes out of lock again at 16 MHz. Suppose that the experiment is repeated, but this time the reference input begins with a very high frequency and steadily moves downward. Predict the frequencies at which lock would be achieved and lost.

Indicate the false statement. Fourier analysis shows that a sawtooth wave consist of

What circuit blocks RF energy above and below a certain limit?

A receiver produces a noise power of 200 mW with no signal. The output level increases to 5 W when a signal is applied. Calculate (S + N)/N as a power ratio and in decibels.

What should be the impedance of a low pass filter as compared to the impedance of the transmission line into which it is inserted?

In order to reduce the harmonic output of a high frequency (HF) transmitter, which of the following filters should be installed at the transmitter?

Indicate the false statement. Modulation is used to

An AM receiver uses a diode detector for demodulation. This enables it satisfactorily to receive

The receiver is tuned to a station at 590 kHz. Calculate the image rejection in decibels, assuming that the input filter consists of one tuned circuit with a Q of 40.