Module 17

For naval communications to be effective, all involved must be top performers. Reliable, secure, and timely receiving and transmitting of information is the goal. Which standard are used to determine whether or not this goal has been met?

What are the two types of electrical communications?

Which of the following terms includes intelligence produced by wire, radio,visual means, oral means or electromagnetic systems?

Radiotelegraph (cw) is valuable when communicating to, from, and among widely separated naval units. What is the main advantage of the cw mode?

Tactical communications is usually considered as line-of-sight. What maximum distance is normally within the line-of-sight range?

You want to transmit high-speed automatic page or tape copy across an ocean area. Which method should you choose?

What method is normally used to transmit graphs electronically?

When you use subdivisions to assign reference designators to equipment, what is the designator of (a) the largest and (b)the smallest?

When using the reference designator1A6A4J6, what level does the number 1 refer to?

What is the total number of frequency bands the military is currently using for communications?

Extremely low-frequency transmissions are primarily directed at which of the following users?

Vlf transmitters are used primarily for which of the following purposes?

Navy use of the low-frequency band is mainly for which, if any, of the following broadcasts?

For which reason does the Navy use only the upper and lower ends of the mf band?

Hf communications over long-distance trunks, or links between fixed terminals are examples of which type of systems?

Sending a message on several frequencies at once is an example of which of the following transmission types?

What type of diversity uses physically separated transmit or receive antennas to improve communications?

Normally the transmission range of vhf is limited to line of sight. What technique is used to increase this range?

A complex of links make up a major communications system. The naval communications system is further broken down into what two groups?

Communications links have many modes of operation. One terminal in a link has its equipment setup in simplex. The other terminal is using two channels or frequencies in a configuration that allows sending and receiving of different messages at the same time. These two terminals working together make up what mode of operation?

What communications link mode of operation provides telecommunications capability between stations at the same time in both directions?

Aid in restoring downed fleet communications channels is furnished on a not-to-interfere basis by which of the following networks?

Which switched networks extends tactical voice to shore based operational commands?

For naval communications to be effective, all involved must be top performers. Reliable, secure, and timely receiving and transmitting of information is the goal. Which of the following requirement standards are used to determine whether or not this goal has been met?

What are the two types of electrical communications?

Which of the following terms includes intelligence produced by wire, radio,visual means, oral means or electromagnetic systems?

Radiotelegraph (cw) is valuable when communicating to, from, and among widely separated naval units. What is the main advantage of the cw mode?

Tactical communications is usually considered as line-of-sight. What maximum distance is normally within the line-of-sight range?

You want to transmit high-speed automatic page or tape copy across anocean area. Which of the following methods should you choose?

What method is normally used to transmit graphs electronically?

When you use subdivisions to assign reference designators to equipment, what is the designator of (a) the largest and (b)the smallest?

When using the reference designator1A6A4J6, what level does the number 1refer to?

What is the total number of frequency bands the military is currently using for communications?

Extremely low-frequency transmissions are primarily directed at which of the following users?

Vlf transmitters are used primarily for which of the following purposes?

Navy use of the low-frequency band is mainly for which, if any, of the following broadcasts?

For which of the following reasons does the Navy use only the upper and lower ends of the mf band?

Hf communications over long-distance trunks, or links between fixed terminals are examples of which of the following types of systems?

Sending a message on several frequencies at once is an example of which of the following transmission types?

What type of diversity uses physically separated transmit or receive antennas to improve communications?

Normally the transmission range of vhf is limited to line of sight. What technique is used to increase this range?

A complex of links make up a major communications system. The naval communications system is further broken down into what two groups?

Communications links have many modes of operation. One terminal in a link has its equipment setup in simplex. The other terminal is using two channels or frequencies in a configuration that allows sending and receiving of different messages at the same time. These two terminals working together make up what mode of operation?

What communications link mode of operation provides telecommunications capability between stations at the same time in both directions?

Aid in restoring downed fleet communications channels is furnished on a not-to-interfere basis by which of the following networks?

Which of the following switched networks extends tactical voice to shore based operational commands?

Of the following transmitter types, which are used for basic communications?

Cw transmissions have narrow bandwidths and a high degree of intelligibility under severe noise conditions. What is the primary Navy use for cw?

A cw transmitter must contain which of the following components?

In a cw transmitter, a buffer stage performs which of the following functions?

There are differences between low- and high-power transmitters. The main difference is the high power transmitter contains a larger number of which of the following types of amplifiers?

In an AM transmitter, audio frequencies are converted into corresponding electrical energy by which of the following components?

In an fm transmitter, a varicap performs which of the following functions?

If an oscillator has a fundamental frequency of 3,550 megahertz, what is the frequency of the third harmonic?

If the fundamental frequency of an rf carrier is 1,000 kilohertz, what is the frequency of the fourth subharmonic?

Oscillator output frequencies are raised to usable values by frequency multipliers. To raise an oscillator frequency from 20 megahertz to 120megahertz, what combination of frequency multipliers would be used?

When an AM signal leaves the antenna of a transmitter, which of the following frequency components does the signal contain?

In a single-sideband transmitter, selection of the desired sideband and suppression of the other is done by which of the following components?

When compared to a conventional AM signal, an ssb signal provides which of the following advantages?

For ship-to-shore teletypewriter circuits,which of the following types of multiplexing is/are used?

Operators of transmitters and receivers use a circuit to coordinate the service of messages and to make frequency changes. What is the name of this circuit?

A transmitted electromagnetic wave enters an antenna, induces a voltage into it, and passes that voltage to a receiver.What is this chain of events called?

When a receiver picks one frequency out from all other frequencies, it's performing which of the following basic functions?

When a receiver separates the audio frequencies from the radio-frequency carrier it is performing which of the following basic functions?

The receiver action of converting electrical energy to a usable format, such as sound, is an example of which of the following basic functions?

Which of the following measurements provides an indication of the ability of a receiver to reproduce weak signals?

Overall sensitivity of a receiver is limited by which of the following factors?

How is a receiver's ability to reject unwanted signals and receive desired signals determined?

When high fidelity is your prime consideration you should select a receiver that has been designed with which of the following features?

The IF frequency in a receiver is produced by which of the following methods?

The process of heterodyning takes place in which of the following receiver circuits?

Of the following frequencies, which one is a typical value of IF for AM communications receivers?

Two or more circuits within a receiver are varied by a single control through the use of which of the following processes?

There are electrical differences between AM and fm receivers. An fm receiver contains which of the following circuits?

An fm signal has which of the following characteristics when compared to an AM signal?

Ssb transmissions have which of the following characteristics when compared to AM transmissions?

Single sideband receivers use a special oscillator. The output of that oscillator is fed directly to the detector circuit. What type of oscillator is used?

A transmitter has a suppressed carrier frequency of 4 megahertz and is radiating only an upper sideband signal. When the intelligence is a 1-kilohertz tone, which of the following sideband frequencies will be transmitted?

Manual gain lets you adjust a receiver for maximum sensitivity and amplify weak input signals. Which of the following internal sections of the receiver are varied by this control?

Manual volume control of a receiver internally varies the input to which of the following circuits?

Changes in receiver input strength due to changing atmospheric conditions is described by which of the following terms?

To automatically compensate for input signal strength variations within a receiver, which of the following types of circuits are added?

AgC circuitry within a receiver uses a portion of which of the following detector voltage components as a feedback signal to preceding stages?

Which of the following types of agc voltage drives an amplifier toward cutoff?

What is the purpose of the squelch circuit in a receiver?

How does a receiver accomplish the squelch function?

A quartz crystal filter is used in a communications receiver to improve which of the following characteristics?

Automatic frequency control circuits are used in a receiver for which of the following purposes?

A change in oscillator frequency will change which of the following input relationships between the sawtooth reference voltage and the incoming signal?

How is the long term stability and accuracy required of modern communications receivers attained?

When using the frequency synthesis process, a signal of the desired accuracy and stability is produced by which, if any, of the following methods?

Permanent magnet speakers respond quite well to which of the following audio frequency ranges?

For which of the following reasons do most standard Navy headphones respond poorly to low frequencies?