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55 Cards in this Set
- Front
- Back
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 communication 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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For Efficient transmissions, which of the following frequency bands requires high power and long antennas?
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ELF, VLF, and LF
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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 SHF band is used extensively in what 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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An FM signal should remain constant in (what) characteristic and change in only (what )characteristic?
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Amplitude and frequency
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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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In a SSB transmitter the carrier is removed to concentrate the power in the sidebands.
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True
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Which of the 4 receiver functions involves extraction of the modulation from the RF signals?
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Detection
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Which of the 4 receiver characteristics 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 watt
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Normal power out is 100 watts. During PMS, you discover that power out has dropped by 3dB. What is the new power out?
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50 Watts
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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-phased transformer?
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Synchro
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When you use subdivisions to assign reference designators to equipment, what is the designator of the (a) largest subdivision and the (b) smallest subdivision?
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System Set
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ELF transmission is primarily directed at which of the users?
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Submarines
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The VLF receive system is designed to receive what type of signals?
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FSK and ICW
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The AN/FRT-72 (IF) transmitter is used to provide (a) how many channels of frequency-division multiplex RTTY traffic over (b) what type of fleet broadcast system at (c) what type of power?
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Eight Multichannel High
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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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Fleet Broadcast
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Which of the following equipment would you use to match a transmitters output impedance to an antennas 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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Which of the following of radio-relay systems provides (a) one-way communications and (b) two-way communications?
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Simplex Duplex
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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 outlet power back to the klystron. This allows for modulations densities as high as 1200 channels and compensates for what klystron deficiency?
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Oscillations
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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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Modulation
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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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What does SAS satisfy?
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Nonsecure Voice Communications, Secure Voice communications, Voice switching signals.
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How many crypto and plain subsystems are used within the SAS.
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Five
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One mode of teletypewriter operation is the synchronous mode. What is the other mode used for the basic teletypewriter operation?
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Asynchronous
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What is the name of the five unit code that includes marks and space signals and is used in teletypewriter operation?
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Baud
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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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In neutral TTY operation current flow and no current flow represent the mark and space conditions. In polor TTY operation what is the condition of the line current?
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It is always positive
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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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After the TTY signal is received, what device must be used to change the signal back to dc pulses?
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converter and receiver
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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 equipment in any configuration needed?
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TTY Panel
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Which of the following methods is/are used to reduce fading or interference in long-range communications?
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Frequency and Space Diversity
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What type of frequency diversity is used for multichannel broadcasts?
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Tone
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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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In AFTS, to what does the term "half-duplex" refer?
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Send Only, Receive only, and Send or Receive.
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