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160 Cards in this Set
- Front
- Back
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What type of equipment is used to coordinate the activities of fleet units by linking them with each other and shore stations?
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Radio
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Radio is the transmission and reception of electronic impulses or signals through space by means of what type of waves?
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Electromagnetic
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Who is ultimately responsible for safety?
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Everyone
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What are the basic requirements of a communications system?
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Transmitter and receiver
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AN/UCC-1, AN/URA-17, and CV-2460 are examples of what type of shipboard equipment?
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Terminal
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Which of the following frequency bands has limited naval use?
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MF
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What does the abbreviation "los" commonly mean?
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Line-of-sight
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The super-high frequency band is used extensively in what type of communications?
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Microwave
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The emission class of an rf transmitter is based on what characteristic?
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Modulation
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What type of modulation is especially suited for use in time-division multiplexing?
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Pulse
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For modern communication needs, CW is not a preferred method. Why is this true?
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CW is slow
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In an FM transmitter, the audio signal shifts the carrier frequency in what network?
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Audio-shift
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Which of the four receiver functions involves extraction of the modulation from the rf signal?
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Detection
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Which of the four receiver characterisitics require compromise because of bandpass requirements?
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Selectivity and fidelity
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What term is used to describe receiver amplification?
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Gain
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The term "dBm" is based on what standard reference level?
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1 milliwatt
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How many radio set controls can be paralleled to one transmitter/receiver group?
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Four
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To transfer control of switched circuits to another transmitter or receiver switchboard, you should use what switch position?
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X
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Which of the following terms is used for a machine that operates as a single-phase transformer?
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Synchro
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Extremely-low-frequency transmission is primarily directed at which of the following users?
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Submarines
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The very-low-frequency receive system is designed to receive what types of signals?
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FSK and ICW
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HF communications from shorebased transmitters to ships at sea using frequency and space diversity is an example to which of the following types of systems?
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Fleet broadcast
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Which one of the following equipment would you use to match a transmitter's output impedance to an antenna's input impedance?
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AN/URA-38
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The AN/VRC-80 is not just a vhf transmitter or receiver. What is the name given to a piece of equipment that performs both functions?
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Transceiver
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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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RPU
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What term is normally used for microwave transmitter input signal?
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Baseband signal
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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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Nonlinearity
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In a typical microwave receiver, what is the standard intermediate frequency?
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70 MHz
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Which of the following methods are usually used for microwave communications?
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LOS and troposcatter
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By which of the following methods can you increase the maximum number of intelligible signals transmitted on a single path?
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Multiplexing
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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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TDM
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How many crypto and plain subsystems are used within SAS?
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Two
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One mode of teletypewriter operation is the synchronous mode. What other mode is used for basic teletypewriter operation?
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Asynchronous
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What is the name of the five unit code that includes mark and space signals and is used in teletypewriter operation?
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Baudot
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Which of the following problems is reduced by not using start and stop signals in the synchronous teletypewriter mode?
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Distorted signal
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Which of the following terms actually pertains only to modulation rate?
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Baud
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What device is used to change TTY DC pulses into mark and space signals to modulate the transmitter carrier wave?
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Keyer
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The Navy's two basic RATT systems are AFTS and RFCS. What is the RFCS system commonly called?
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FSK
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What device provides looping current for the tty?
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A solid state power supply
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What is/are used to interconnect all the TTY equpiment in any configuration needed?
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TTY panel
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During unpatching, pulling which plug from its tty panel jack first will produce a dangerous dc voltage on the exposed plug?
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Set
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How many rotary switch positions will you find on a remote transmitter control unit?
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Three
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What type of frequency diversity is used for multichannel?
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Tone
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Which of the following methods should you use to transmit printed text?
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Facsimile
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In whihc of the following publications can you find information on TEMPEST requirements?
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MIL-STD-1680
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What is the designator of any conductor intended to carry classified plain language terminating in RED equipment or the RED side of crypto equipment?
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Primary Red
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Of the following radios, which is popularly known as the "Gibson girl"?
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AN/CRT-3A
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Which of the following radios is particularly useful during tactical black-out operations?
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AN/PRC-104
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Which of the following radios has frequency hopping capability?
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AN/PRC-117
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The use of frequency hopping has certain advantages. One advantage is that the signal is difficult to detect. How is this accomplished?
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No single carrier is used
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What system was specifically designed to provide solutions to equipment planning by automatically determining the best system that each participant in a communications link should use?
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CLIPS
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Which term refers to reception and retransmission?
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Active
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Which of the following terms refers to transmissions received from a satellite?
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Downlink
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SATCOM links are only slightly affected by what phenomena associated with hf propogation difficulties?
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Atmospheric
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Trained crews can set up what type of satellite earth terminals within hours to establish communications in remote areas?
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Mobile
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How many NCTAMS have primary responsibility for communications via satellite?
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Four
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What system do subscribers use to receive Fleet Satellite Broadcast?
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AN/SSR-1
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What is the minimum number of broadcast channels that NAVMACS guards automatically?
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Four
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What is the bandwith (in kHz) of the satellite channels allocated to CUDIXS/NAVMACS?
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25
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What term is associated with a submarine commander's ability to receive messages via satellite at scheduled intervals?
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Group broadcasts
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Secure voice uses digitized voice with a 3-kHz voice channel. What type of voice modulation does this describe?
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Narrowband
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When using Secure Voice, a ship must contact what authority before initiating communications with a shore command?
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Voice controller
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Which of the following is a subsystem specifically designed for special intelligence communicatons?
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TACINTEL
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TADIXS-equipped surface ships and submarines operate in what mode?
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Receive only
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What subsystem is used in conjunction with TADIXS to transmit OTH-T data from the fleet to other ships and shore commands?
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OTCIXS
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What system was developed to multiplex several users on one 25-kHz satellite channel?
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DAMA
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What term is used to describe how the Demand Assigned Multiple Access data stream is formatted?
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Frame
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In the DAMA multiplexed data stream, which slow is used to test for communications error?
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Link
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What are all DAMA multiplexor transmit times referenced to?
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The satellite
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Which of the following equipments is used as the DAMA mulitplexor?
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TD-1217B/U
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Who performs day-to-day control and operatio nof naval satellite communications assets?
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Naval Computer and Telecommunications Command
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How man FLTSATCOM satellites have ehf packages installed?
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Two
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LEASAT satellites have fewer 25 kHz channels than FLTSATs. What ground based system do they use to maintain communications efficiency?
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DAMA
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What is the replacement satellite for GAPFILLER, FLTSATCOM, and LEASAT?
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UHF F/O
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The AN/FSC-79 satellite communications terminal transmits on what band?
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SHF
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Which of the following is another term used to describe the shf communications band?
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X-band
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The AN/WSC-5(V) UHF transceiver is capable of using differentially encoded phaseshift-keying and what other type of modulation?
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FM
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Which of the folloiwng radios is the primary shipboard los and satellite transceiver?
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AN/WSC-3
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What shipboard system is used to receive Fleet Satellite Broadcast?
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AN/SSR-1
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Which of the following is a spread spectrum type modem and is used with the AN/FSC-79 satellite communications terminal?
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OM-51A/FR
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The AN/USQ-69(V) data terminal set is currently used with what two subsystems?
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TACINTEL/ NAVMACS
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Audio digital converter CV-3333/U is used primarily as an analog-to-digital converter for what type of communications?
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Secure voice
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Where are the system interface connectors installed on the Electrical Equipment Rack CY-7597/WSC-3?
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On the top panel
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DAMA-equipped shore installations use the OK-481(V)2/FSC Control Monitor Group to interface TD-1271B/Us, AN/WSC-5(V)s, and baseband equipment. It can accomodate up to how many TD-1271B/Us?
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14
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Link-11 is designated as which of the following types of tactical data information link?
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TADIL A
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Link-11 Communications can operate with which of the following radios?
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HF or UHF
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The size of an antenna is determined by which of the following factors?
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The operating frequency
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The frequency range of an antenna can be extended by adding which of the following factors?
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Either a capacitive or an inductive load
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Whihc of the folloiwng function s ins NOT performed by the data terminal set?
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Converting audio tones to digital data
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The data terminal set communicates with the radio set via which of the following devices?
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The communications switchboard
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Which of the following individuals is responsible for assigning primary and secondar Link-11 frequencies before the deployment of a task force?
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The task force commander
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Net Sync continuously broadcasts which of the following signals?
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Preamble frames
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When the stored sync mode is operating, the picket station uses which of the following signals to establish a time base?
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The sync signal received from NCS
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Which of the folloiwng functions is NOT tested when Net Test is running?
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CDS computer to DTS interface
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The preamble of a Link-11message consists of a total of how many frames?
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Five
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During transmission of the preamble, the 605 Hz tone is transmitted at which of the following power levels?
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+ 6 dB
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To enable the DTS to detect frame transitions during the preamble, the 2915 HZ sync tone is phase shifted how many degrees at each frame?
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180 degrees
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Exactly how many data bits are contained in each Link-11 information frame?
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24
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The control stop code is generated by which of the following units?
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NCS only
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A call-up, or interrogation message, consisits of a total of how many frames?
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Five
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The two frames following a control stop code indicate which of the following?
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The next picket address in the roll call
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The DTS operates in full duplex when it performs which of the following operations?
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System Testing
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The DTS performs which of the followng functions?
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Error detection and correction
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The xis hamming bits added to the data word enables the DTS to correct what maximum number of data bits?
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One
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The DTS develops a composite signal consisting of what total number of frequency division multiplexed audio-frequency tones?
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16
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Bits 4 and 5 of a 30-bit data word are carried by which of the following audio tone frequencies?
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1155 Hz
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What is the basic unit of the Link-11 Transmission?
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Tone
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In a single frame, the DTS can tolerate what maximum phase shift error without generating an error code?
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+/- 44 degrees
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Which of the following Link-11 signals allows the receiving unit to correct errors caused by the relative motion between the sending and receiving units?
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Doppler tone
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When the DTS is in the OPERATE mode, exactly how many fault sensing sensors can cause the SUMMARY FAULT lamp to light?
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14
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When the SIDEBAND SELECT switch is in the DIV position, which sideband signal is processed for input to the computer?
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The combination of the USB and LSB signals
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During normal Link-11 operations, the DATA RATE switch on the mode control panel should be in which of the following positions?
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TADIL A
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The SYNC MODE switch on the mode control panel is used in conjunction with which of the following switches on the TADIL A Control Panel?
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TIMING STORED/CORRECTED switch
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The NET BUSY indicator of the TADIL A control panel is activated by which of the following signals?
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Signal presence
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The SYNC COMPT indicator is lighted after the DTS has acheived which of the following conditions?
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It is in sync with NCS
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With a single address control indcator, an NCS platform can control what maximum number of participating units?
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20
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Data exchange between the Link-11 DTS and the CDS computer is controlled by the DTS using which fo the following control signal protocols?
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External interrupts
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When the DTS recognizes own station address, it transmits which of the following signals first?
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The first frame of the preamble
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Whihc of the folloiwng events takes place when the CDS computer does not answer an ODR from the DTS within the specified time limit?
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The DTS generates the stop code
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Which of the following events occur if an interrogated picket station does not answer an initial interrogations from the NCS within 15 frame intervals?
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NCS retransmits the interrogation to the unit that did not reply
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A total of how many data tones are in teh composite tone package developed by the DTS?
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16
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During receive operations, exactly how many EDAC bits are extracted from the received data tones?
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6
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The EDAC bits enable the DTS to correct a total of how many received bit errors?
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1
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When operating the Link-11 with a UHF radio set, you should place the SIDEBAND SELECT switch in what position only?
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USB
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When you keep the radio set tuned to output maximum power, it causes which of the following problems?
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Increases RFI/EMI on the transmitting unit only
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When the NCS enters dummy PUs, whcih fo the following net conditions will exist, if any?
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Net cycle time increases
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When you set up the DTS to run a single-station POFA with the radio set, which of the following equipments is/are NOT checked?
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Antenna coupler
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Running a single-station POFA can assist the technician in isolating a problem in which of the following sections of DTS?
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Transmit timing
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A single broken line in the switchboard between the DTS and the crypto device could cause which of the following problems?
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All bits randomly set to a logic "1" or a logic "0"
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When you set up the DTS to runa single station POFA, the DTS must be configured to operate inw hich of the following modes?
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POFA test mode
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The multi-station POFA is run, what total number of data words are in each block of data transmitted?
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230
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When a multi-station POFA is run, all units participating in the test should be positioned within how many miles of each other?
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25
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A multi-station POFA should be run using which of the following frequencies?
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The current operational frequency only
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The multi-station POFA should be run for what minimum amount of time?
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5 minutes
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A multi-station POFA should be considered successful when the link quality factor is which of the following values?
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Greater than 95 percent but less than 100 percent
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A multi-station POFA is considered successful when the computed receive error factor is less than what percentage?
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1
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Which of the following buffers is acceptable to be received from an unrecognized station (UNREC STA) when a multistation POFA is running?
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One buffer of 230 words
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The DPG and CDG equipment cases of the LMS-11 provide isolation from which of the following environmental forces?
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Shock and vibration
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The LMS-11 system printer is part of which of the following equipment groups?
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Accessory
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The multi-station POFA is run in which of the following modes?
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Roll call
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The HP 9920U computer of the LMS-11 contains what amount of random access memory (RAM)?
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2 MB
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To determine the phase shift of the Link-11 audio tones, the LMS-11 uses which of the following methods?
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Fast Fourier Transform Formula
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The control/display group consists of which of the following units?
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Color monitor and keyboard
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The color display monitor of the LMS-11 uses composite video when it performs which of the following operations?
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Both start-up and testing operations
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When initializing the LMS-11, the operator enters 127 frames as teh CALL-TIMEOUT value. What type of Link-11 operation is indicated by this entry?
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Satellite Link Operation
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The link monitor mode of the LMS-11 displays what information?
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Real-tiem link activity
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Which of the following function keys on the LMS-11 keyboard would the operator depress to select the link monitor mode?
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LM
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A PU address of 77 is used by the LMS-11 to indicate which of the following units, if any?
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NCS
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Carrier suppression can only be tested when the Link-11 system is operating in which of the following modes?
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Net Sync
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Link-4A is used to transmit which of the following types of information?
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Aircraft control and target information
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Link-4A data is transmitted by using which of the following methods?
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Frequency-shift keying
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What ist he maximum number of aircraft that can be controlled by a single Link-4A controlling station?
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100
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In which of the following Link-4A modes of operation is an aircraft directed to a specific location to be at an optimum position for an attack?
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Intercept vectoring
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Intercept vectoring in which of the following Link-4A modes of operation is used to maintain safe flight patterns and assigns priority for landing approach?
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Air traffic control
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Which of the following Link-4A modes of operation is used for the remote guidance of bombers, reconnaissance aircraft, and drones?
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Precision course direction
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In which of the folloiwng Link-4A modes of operation is used to land an aircraft ont he flight deck of a carrier?
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Automatic carrier landing system
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The CAINS aircraft alignment data loaded into the navigation computer of the aircraft consists of which of the following types of data?
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the latitude, longitude, and ship's velocity
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The CAINS receive cycle duration is equal to what total number of milliseconds?
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18
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What total number of time slots make up the sync preamble of each transmit frame?
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13
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What total number of transmit frame time slots contain message data bits?
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56
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