RF Communication Systems Quiz

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Questions and Answers

What is the typical range for the UHF communication band?

  • 300 Mhz- 3Ghz (correct)
  • 3-30 Mhz
  • 1 Ghz- 3 Ghz
  • 100 Mhz- 1 Ghz

What type of antenna is used for HF transmission (Twin Whips)?

  • AS-1735
  • OE-418A (correct)
  • AS-3771B/U
  • AS-4163

What is the primary function of a coupler in RF communication?

  • Filtering unwanted frequencies from the RF signal
  • Amplifying the RF signal strength
  • Generating the RF signal waves
  • Matching the RF signal impedance to the antenna (correct)

Which communication system is considered mission critical and supports command and control operations on the ship?

<p>ON-740 (D)</p> Signup and view all the answers

What is the maximum estimated range for UHF LOS communication?

<p>30-40 nautical miles (B)</p> Signup and view all the answers

What system is used for electronic patching of various radio circuits?

<p>TVS (C)</p> Signup and view all the answers

Which of the following DMRs is used exclusively for UHF SATCOM operations?

<p>DMR 7 (D)</p> Signup and view all the answers

What does HF stand for in the context of communication?

<p>High Frequency (C)</p> Signup and view all the answers

Which system provides a secondary means for message traffic via UHF SATCOM?

<p>CUDIXS (D)</p> Signup and view all the answers

What does the acronym DRRS-N stand for?

<p>Defense Readiness Reporting System-Navy (A)</p> Signup and view all the answers

What feature of HF communication allows for its use in long-distance communication?

<p>The ability of radio waves in the HF band to reflect off the ionosphere (C)</p> Signup and view all the answers

Which system provides situational awareness (SA) and tracking of forces for the U.S. Navy?

<p>GCCS-M (A)</p> Signup and view all the answers

What is the difference between UHF LOS and UHF SATCOM?

<p>UHF LOS relies on direct line-of-sight transmission, while UHF SATCOM uses satellites for relay (A)</p> Signup and view all the answers

What is the primary means for obtaining message traffic?

<p>OIX (D)</p> Signup and view all the answers

Which antenna is located in front of the pilot house?

<p>AS 4679 3-10B (C)</p> Signup and view all the answers

What is the primary RF path for IP services?

<p>LINK- UTJ (D)</p> Signup and view all the answers

What is the primary purpose of the Furuno 8900S Radio Set?

<p>Non-secure voice communication for safety-at-sea information between ships and piloting stations (C)</p> Signup and view all the answers

What type of communication does the AN/WSC-9(V)2 system provide?

<p>EHF satellite communication with low probability of detection and anti-jam capabilities (D)</p> Signup and view all the answers

Which communication system is primarily used for navigation and amphibious operations?

<p>VHF LOS communication using the Furuno 8900S (D)</p> Signup and view all the answers

What type of communication does the IAD (International Air Distress) frequency of 121.5 Mhz use?

<p>VHF LOS communication (A)</p> Signup and view all the answers

Which of the following is NOT a capability of the EHF (30 Ghz- 300 Ghz) communication system?

<p>Long-range satellite communication with high probability of detection (A)</p> Signup and view all the answers

Which communication system is used for green gear communication between ship and boots on the ground?

<p>PRC communication (B)</p> Signup and view all the answers

What is the purpose of the 3-13 AS-4667 antenna located above the Pilot House?

<p>To provide EHF satellite communication capabilities (C)</p> Signup and view all the answers

Which communication system provides MTJ (Multi-Level Transmission) services over a TIP (Time Division Multiple Access Interface) path?

<p>EHF communication (C)</p> Signup and view all the answers

What is the primary function of CENTRIXS?

<p>To enable information sharing among coalition networks (D)</p> Signup and view all the answers

Which system is primarily used for purchasing goods onboard ships?

<p>NAVY CASH (A)</p> Signup and view all the answers

What does the Navy Standard Integrated Personnel System (NSIPS) provide to Sailors?

<p>Access to training materials and career records (C)</p> Signup and view all the answers

What is the purpose of the Automated Digital Networking System (ADNS)?

<p>To transmit IP data across various communication systems (D)</p> Signup and view all the answers

Which of the following systems is involved in ship and inventory management?

<p>NTCSS (D)</p> Signup and view all the answers

What distinguishes the Non-classified Internet Protocol Router Network (NIPRNET)?

<p>It is dedicated to unclassified communications. (A)</p> Signup and view all the answers

What type of data does ADNS utilize for transmission?

<p>IP data from connected networks (A)</p> Signup and view all the answers

What does the NIAPS system provide access to?

<p>Real-time logistics information and technical support (C)</p> Signup and view all the answers

Flashcards

Radiofrequency (RF) Energy

Electromagnetic energy consisting of electric and magnetic waves.

HF Communication

High Frequency communication, ranging from 3 to 30 MHz, used for long-distance exchanges.

HF Transmitters (T-1603)

Transmitters that operate on HF, with a total of 9 units: 8 broadband and 1 narrowband.

HF Receivers (R-2557)

Devices that receive HF signals, with a total of 18 units.

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HF Coupler

Device that matches RF signals to the antenna for efficient transmission.

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UHF Communication

Ultra High Frequency communication, ranging from 300 MHz to 3 GHz, supporting line-of-sight transmissions.

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Line-of-Sight (LOS) Propagation

UHF radio waves travel in a straight line and can be blocked by obstacles.

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Link 11

Data link allowing exchange of tactical information between Link 11-capable units in both HF and UHF.

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Furuno 8900S Radio Set

VHF radio system used for non-secure voice communication between vessels.

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VHF LOS Communications

Line of Sight communication capability for ship-to-ship and ship-to-shore.

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NMT (Navy Multiband Terminal)

Terminals providing satellite communication in EHF and SHF bands.

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PTP Circuit

Point to Point voice or data circuit between one ship and another unit.

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IAD Frequency

International Air Distress channel operating on 121.5 MHz.

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POTS

Plain Old Telephone System providing secure and unsecure voice communications.

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ON-740

A secure voice system used for tactical communications on ships.

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IVCS

Shipboard phone system managed by the Integrated Communications (IC) department.

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TVS

Tactical Variant Switch for electronic patching of radio circuits.

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SWICS

Shipwide Interior Wireless Communications System for shipboard radios.

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SIPRNET

Secret Internet Protocol Router Network for classified communications.

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DRRS-N

Defense Readiness Reporting System-Navy for evaluating Navy readiness and capabilities.

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GCCS-M

Global Command and Control System-Maritime for situational awareness and force tracking.

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CENTRIXS

A coalition network system for information sharing through email, web services, and VoIP.

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NIAPS System

An unclassified system giving sailors access to training materials and support applications.

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NTCSS

Software suite for ship and inventory management in Navy and Marine Corps operations.

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NAVY CASH

A system for purchasing goods on ships, replacing traditional currency.

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NSIPS

The Navy’s electronic pay and personnel system allowing easy access to records.

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ADNS

Automated Digital Networking System for transferring IP data across RF networks.

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KG-175 Taclane

A device ensuring secure data transfer across different security enclaves.

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Study Notes

Radiofrequency (RF) Energy

  • RF energy is another name for radio waves
  • It's a form of electromagnetic energy
  • Consists of electric and magnetic energy waves moving together
  • Generated by transmitters and sent through antennas
  • Travels at the speed of light to distant antennas and receivers

High Frequency (HF) Communication

  • HF communication operates in the 3-30 MHz range
  • HF transmitters (T-1603) consist of 9 units (8 broadband, 1 narrowband)
  • HF receivers (R-2557) total 18 units

R-2557/URC Radio Receiver

  • A general-purpose LF/MF/HF receiver
  • Designed for computer-controlled systems
  • Operates in AM, CW, FSK, USB, LSB, and ISB modes
  • Operates in the 14kHz to 1.61999 MHz and 2 to 29.99999 MHz frequency range
  • Tunable in 1 Hz increments
  • Stores up to 100 preset channels
  • LF/MF wired receivers connected in positions 1-4 via F-1650/URC Bandpass Filter AUX RF input port
  • Narrowband transmitter (R-2557 unit #5) is linked to the F-1650/URC AUX port

HF Couplers

  • Match RF signals to antennas
  • Examples include: CU-2544, CU-2475A, CU-2416A, and CU-2460

HF Antennas

  • Examples include: 2-3 OE-418A Transmit (Twin Whips)

Other Communication Types

  • UHF (300 MHz - 3 GHz): used for ship-to-ship, ship-to-shore, ship-to-air communication

  • DMRs: used for various UHF communication types

  • VHF (30 MHz - 300 MHz): includes portable radio communication, bridge-to-bridge communication, etc. Requires communication between ship-masters and piloting stations

  • EHF: long-range satellite communication with low detection probability

  • SHF: has long range satellite communication, primarily use for IP services; secure and unsecure voice communication

  • ON-740: secure voice system for tactical communications

  • IVCS: shipboard telephone system

  • TVS: electronic patching system to connect various radio circuits

  • SWICS: ship-wide interior wireless system (walkie-talkies)

  • TSN: Tomahawk Strike Network

  • Fleet broadcast: Another method of message traffic via UHF satellites.

  • Computer systems: examples include SIPRNET (Secret Internet Protocol Router Network) and DRRS-N

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