Term
| For efficient transmission, which of the following bands require high power and long antennas? |
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Definition
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Term
| What is the name of the 5 unit code that includes mark and space signals and is used in teletypewriter operation? |
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Definition
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Term
| Which of the following methods are usually used for microwave communications? |
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Definition
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Term
| During patching, pulling which plug from its tty panel jack first will produce a dangerous DC voltage on the exposed plug? |
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Definition
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Term
| What type of equipment is used to coordinate the activities of fleet units by linking them to each other and shore stations? |
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Definition
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Term
| What term is used to describe receiver amplification? |
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Definition
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Term
| What are the basic requirements for a communications system? |
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Definition
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Term
| What does the abbreviation "LOS" typically mean? |
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Definition
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Term
| For modern communications needs, CW is not a preferred method. Why is this true? |
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Definition
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Term
| How many switch positions will you find on a remote transmitter control unit? |
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Definition
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Term
| By which of the following methods can you increase the maximum number of intelligible signals on a single path? |
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Definition
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Term
| Which of the following requirements does SAS satisfy? |
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Definition
| Nonsecure voice communications, secure voice communications, and voice signal switching. |
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Term
| Radio is the transmission of electronic impulses or signals through space by means of what type of waves? |
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Definition
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Term
| Which of the following communications methods involves subdividing a channel into smaller segments of equal size and placing a signal in each subchannel? |
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Definition
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Term
| An FM signal should remain constant in what characteristic and change in what characteristic? |
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Definition
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Term
| The super-high frequency band is used extensively in what kind of communications? |
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Definition
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Term
| The emission class of an rf transmitter is based on what characteristic? |
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Definition
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Term
| True/False: In a SSB transmitter, the carrier is removed to concentrate the power in the sideband(s). |
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Definition
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Term
| To transfer control of switched circuits to another transmitter or receiver switchboard you should use what switch position? |
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Definition
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Term
| Which of the following frequency bands has limited naval use? |
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Definition
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Term
| During UHF secure voice transmission, the operator uses a secure voice remote phone unit. What is the common term for this unit? |
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Definition
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Term
| The term "dBm" is based on what standard reference level? |
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Definition
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Term
| What type of modulation is especially suited for time-division multiplexing? |
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Definition
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Term
| In a typical microwave receiver, what is the standard intermediate frequency? |
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Definition
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Term
| Which of the four receiver characteristics require compromise because of band pass requirements? |
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Definition
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Term
| How many radio set controls can be paralleled to one transmitter/receiver group? |
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Definition
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Term
| Which of the following terms for a machine that operates as a single-phase transformer? |
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Definition
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Term
| The AN/VRC-80 is not just a vhf transmitter or receiver. What is the name of a piece of equipment that performs both functions? |
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Definition
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Term
| Which of the following terms pertains only to modulation rate? |
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Definition
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Term
| In neutral TTY operation, current flow and no current flow represent the mark and space conditions. In polar tty operation what is the condition of the line current? |
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Definition
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Term
| Which of the following problems is reduced by not using start and stop signals in the synchronous teletypewriter mode? |
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Definition
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Term
| How many crypto and plain subsystems are used within SAS? |
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Definition
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Term
| Who is ultimately responsible for safety? |
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Definition
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Term
| Which of the four receiver functions involves extraction of the modulation from the rf signal? |
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Definition
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Term
| The very-low frequency receive system is designed to receive what types of signals? |
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Definition
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Term
| AN/UCC-1, AN/URA-17, and CV-2460 are examples of what type of shipboard equipment? |
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Definition
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Term
| The AN/FRT-72 transmitter is used to provide how many channels of frequency-division multiplex rtty traffic over What type of fleet broadcast system at what type of power? |
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Definition
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Term
| HF communications from shore-based transmitters to ships at sea using frequency and space diversity is an example of which of the following types of systems? |
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Definition
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Term
| What device provides looping current for the tty? |
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Definition
| A solid state power supply |
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Term
| What type of frequency diversity is used for multichannel? |
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Definition
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Term
| Which of the following types of equipment would you use to match a transmitter's output impedance to an antennas input impedance? |
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Definition
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Term
| One mode of teletypewriter operation is synchronous mode. What other mode is used for basic teletypewriter operation? |
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Definition
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Term
| In AFTS, to what does the term "half-duplex" refer? |
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Definition
| Send only, Receive only, Send or Receive |
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Term
| In an FM transmitter, the audio signal shifts the carrier frequency in what network? |
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Definition
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Term
| When you use subdivisions to assign reference designators to equipment, what is the designator of the largest subdivision? The smallest? |
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Definition
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Term
| In a microwave transmitter, the linearize couples a portion of the output power back to the klystron. This allows for modulation densities as high as 1200 channels and compensates for what klystrong deficiency? |
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Definition
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Term
| Extremely-low frequency transmission is primarily directed at which of the following users? |
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Definition
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Term
| What term is normally used for microwave transmitter input signal? |
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Definition
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Term
| The Navy's two basic RATT systems are AFTS and RFCS. What is the RFCS system commonly called? |
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Definition
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Term
| What device is used to turn TTY DC pulses into mark and space signals to modulate the transmitter carrier wave? |
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Definition
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Term
| What is/are used to interconnect all the TTY equipment in any configuration needed? |
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Definition
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Term
| Which methods are used to reduce fading and interference in long range communications? |
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Definition
| Frequency diversity and space diversity |
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