CDC 2e153 Ground Radio Communications Journeyman

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  • 1/133 Questions

    What happens to duplicate messages that might be received on more than one missile site communications system?

    • Duplicates are deleted
    • Duplicates are stored in memory
    • Duplicates are returned to the source transmitter
    • Duplicates are displayed and await operator action
Please wait...
About This Quiz

This quiz assesses knowledge in ground radio communications, focusing on AFSPC missions, HF systems, missile site communications, and command structures.

CDC 2e153 Ground Radio Communications Journeyman - Quiz

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  • 2. 

    What does the Minuteman MEECN Program use to prevent electromagnetic pulse damage?

    • High current fuses

    • Lead-cased enclosures

    • Electrical surge arrestors

    • Automatic circuit disconnect

    Correct Answer
    A. Electrical surge arrestors
    Explanation
    The Minuteman MEECN Program uses electrical surge arrestors to prevent electromagnetic pulse damage. Electrical surge arrestors are devices that protect electrical systems from voltage spikes by diverting excess current to the ground. This helps to prevent damage to sensitive electronic equipment caused by electromagnetic pulses, which are short bursts of electromagnetic energy that can disrupt or destroy electronic devices. High current fuses, lead-cased enclosures, and automatic circuit disconnects are not specifically designed to protect against electromagnetic pulses, making them incorrect options.

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  • 3. 

    Which statement best describes the function of a high frequecy (HF) system enhanced with automatic link establishment (ALE) capability?

    • The ALE circuity ensures only the most-critical data is transmitted

    • The ALE circuity ensures all data is transmitted, but sends the most-critical first

    • The ALE circuity stores transmitted intelligence in its memory and sends it when the channel is clear

    • The ALE circuity automatically tests several channels and selects the clearest for communications

    Correct Answer
    A. The ALE circuity automatically tests several channels and selects the clearest for communications
    Explanation
    The ALE circuitry automatically tests multiple channels and chooses the one with the least interference for communication. This ensures that the communication is carried out on the clearest channel, improving the quality and reliability of the transmission.

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  • 4. 

    We define Link Quality Analysis as?

    • Reviewing a network station listing and determining which is assigned a clear channel

    • Reviewing a network station listing and assigning a channel to each

    • The process of sounding and determining channel clarity

    • The process of calling and determining channel clarity

    Correct Answer
    A. The process of sounding and determining channel clarity
    Explanation
    Link Quality Analysis refers to the process of evaluating and assessing the clarity of a channel by conducting sound tests. This involves analyzing the quality of the connection and determining its reliability and performance. The term "sounding" is commonly used in the context of wireless communication to measure the channel quality and assess its suitability for transmitting data. Therefore, the given answer accurately describes the concept of Link Quality Analysis.

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  • 5. 

    Which SCOPE Command mission provides high frequency (HF) communications for the President, Vice President, and Cabinet members?

    • DCS HF Entry

    • USAF Global

    • Mystic Star

    • SITFAA

    Correct Answer
    A. Mystic Star
    Explanation
    Mystic Star is the correct answer because it is the mission that provides high frequency (HF) communications for the President, Vice President, and Cabinet members. The other options, DCS HF Entry, USAF Global, and SITFAA, do not specifically mention providing HF communications for these individuals.

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  • 6. 

    What is one advantage of using SCOPE Command's high frequency (HF) signal as opposed to satellite for sending and receiving E-mails?

    • Better security

    • HF is most likely to be available during crises

    • HF allows attachment of larger text documents

    • Satellite E-mail is often overrun with Spam

    Correct Answer
    A. HF is most likely to be available during crises
    Explanation
    During crises, such as natural disasters or emergencies, satellite communication systems may become disrupted or unavailable. On the other hand, the high frequency (HF) signal used by SCOPE Command is more likely to remain accessible even in such situations. This advantage makes HF a reliable option for sending and receiving emails during times of crisis when other communication channels may be compromised.

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  • 7. 

    What transport protocol is used for communication between all SCOPE Command software?

    • TCP/UDP

    • TCP/IP

    • RMTP

    • HTTP

    Correct Answer
    A. TCP/IP
    Explanation
    The correct answer is TCP/IP. TCP/IP is a widely used transport protocol that allows communication between devices on a network. It is the foundation of the internet and is used for transmitting data packets between computers. SCOPE Command software, being a network-based software, would rely on TCP/IP for communication between different instances of the software. TCP/IP ensures reliable and efficient transmission of data, making it the most suitable choice for this purpose.

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  • 8. 

    What is the primary difference between the receive/transmit (RT) used at the transmitter sited and the RT units used at the receiver sites at a SCOPE Command station?

    • There is no difference, they are the same unit

    • One has a detector, the other a power amplifier

    • Internally driven software that is loaded from the CNCS

    • One has a detector, the other has a signal discrimator

    Correct Answer
    A. There is no difference, they are the same unit
    Explanation
    The primary difference between the receive/transmit (RT) units used at the transmitter site and the receiver sites at a SCOPE Command station is that there is no difference, they are the same unit. Both the transmitter site and the receiver sites use the same RT units, indicating that there is no distinction between them in terms of their hardware or functionality.

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  • 9. 

    What is the tune level used during the RF loop-back test?

    • 0 dBm

    • -5 dBm

    • -13 dBm

    • -113 dBm

    Correct Answer
    A. -13 dBm
    Explanation
    In the RF loop-back test, the tune level used is -13 dBm. This tune level is selected because it provides an optimal power level for the test without causing any distortion or interference in the signal. It ensures that the signal is strong enough to be accurately measured and analyzed, but not too strong to cause any issues in the test setup.

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  • 10. 

    Which sommunication system is a commercial telephone switch?

    • AN/PRC-117F

    • Redcom-IGX

    • DNE TAC-900

    • CSU/DSU

    Correct Answer
    A. Redcom-IGX
    Explanation
    The Redcom-IGX is a commercial telephone switch. It is a communication system that is specifically designed for use in commercial telephone networks. The other options listed, AN/PRC-117F, DNE TAC-900, and CSU/DSU, are not commercial telephone switches but rather different types of communication equipment used for other purposes.

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  • 11. 

    Which Command does the SPecial Operations Communications Flight Support?

    • US Central Command

    • US Joint Forces Command

    • US Special Operations Command

    • US Strategic Command

    Correct Answer
    A. US Special Operations Command
    Explanation
    The correct answer is US Special Operations Command. This command is responsible for providing communications support to special operations forces. They ensure that these forces have the necessary communication capabilities to carry out their missions effectively.

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  • 12. 

    What was the White House Communications Agency originally known as?

    • Defense Communications Agency

    • White House Communications Agency

    • White House Signal Detachment

    • Office of the Chief Signal Office, Army Signal Corps

    Correct Answer
    A. White House Signal Detachment
    Explanation
    The correct answer is White House Signal Detachment. The White House Communications Agency was originally known as the White House Signal Detachment. This agency is responsible for providing communication support to the President and other senior government officials.

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  • 13. 

    Which organization plans, coordinates, directs, and performs signals intelligence and information security functions in support of both Defense and non-Defense US Government activities?

    • AFPCA

    • DISA

    • NSA

    • WHCA

    Correct Answer
    A. NSA
    Explanation
    The National Security Agency (NSA) is the correct answer because it is the organization responsible for planning, coordinating, directing, and performing signals intelligence and information security functions in support of both Defense and non-Defense US Government activities. The other options listed (AFPCA, DISA, WHCA) are not involved in signals intelligence and information security functions to the same extent as the NSA.

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  • 14. 

    Which system is a commercial telephone switch

    • PRC-117

    • VOX

    • CSU/DSU

    • Redcom - IGX

    • JSTARS

    Correct Answer
    A. Redcom - IGX
    Explanation
    Redcom - IGX is the correct answer because it is a commercial telephone switch. The other options listed, PRC-117, VOX, CSU/DSU, and JSTARS, are not commercial telephone switches.

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  • 15. 

    State the three steps of ALE linking

    • Call, response, acknowledgement

    • Call, response, call back

    • Response, call, talking

    • Acknowedgement, message, call

    • Call, call back, talking

    Correct Answer
    A. Call, response, acknowledgement
    Explanation
    The three steps of ALE linking are call, response, and acknowledgement. This means that the process begins with a call, where a request or query is made. Then, a response is received, providing the necessary information or action. Finally, an acknowledgement is sent to confirm the successful completion of the request or transaction.

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  • 16. 

    What is the team that function is to recover and relaunch aircraft

    • TAC-P

    • ROMAD

    • SART

    • SERE

    • DVO

    Correct Answer
    A. SART
    Explanation
    SART stands for Search and Rescue Team. Their function is to recover and relaunch aircraft in emergency situations. They are trained to respond quickly and efficiently to locate and rescue individuals in distress, as well as to provide medical assistance if needed. SART teams are an essential part of aviation safety, ensuring that any aircraft incidents are handled effectively and lives are saved.

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  • 17. 

    What was WHCA originally known as?

    • White House Radio Communications

    • White House Communications Agency

    • White House Signal Detachment

    • White House Transmisson Systems

    • White House Comm Analyzers

    Correct Answer
    A. White House Signal Detachment
    Explanation
    The correct answer is White House Signal Detachment. This is the original name for WHCA, which stands for White House Communications Agency. The White House Signal Detachment was responsible for providing secure and reliable communication services to the President and other high-level officials.

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  • 18. 

    Which statement is true concerning receiver operation?

    • In order to change the operating frequency, we must change the IF only

    • When we change frequencies, the IF does not change, local oscillator frequency does

    • Changing the local oscillator frequency has no effect on our operating frequency

    • When we change frequencies, the IF changes by an amount equal to the change in the local oscillator frequency

    Correct Answer
    A. When we change frequencies, the IF does not change, local oscillator frequency does
  • 19. 

    During transmit operation, what is the purpose of the compressor circuit in the RT-1446 HF Transceiver?

    • Equalizes varying voice levels so the audio signal is more uniform in amplitude

    • Amplify the microphone audio level to ensue it is of adequate amplitude

    • Provides a tune-select signal to the antenna coupler

    • Provides heterodyning of the audio and RF carrier

    Correct Answer
    A. Equalizes varying voice levels so the audio signal is more uniform in amplitude
    Explanation
    The compressor circuit in the RT-1446 HF Transceiver is used to equalize varying voice levels so that the audio signal is more uniform in amplitude. This helps to ensure consistent audio quality during transmit operation. The compressor circuit adjusts the audio levels to prevent distortion and maintain a consistent volume level, resulting in a clearer and more understandable transmission.

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  • 20. 

    In the AM-7223 LPA, which circuit provides outputs that are directly proportional to the forward and reflected power?

    • VSWR Bridge

    • Directional Filter

    • Power and control subgroup

    • Tanks's signal detection circuit

    Correct Answer
    A. VSWR Bridge
    Explanation
    The VSWR Bridge circuit in the AM-7223 LPA provides outputs that are directly proportional to the forward and reflected power. The VSWR (Voltage Standing Wave Ratio) Bridge is used to measure the impedance mismatch between the transmitter and the load, which can cause reflections of power. By measuring the forward and reflected power, the VSWR Bridge can provide accurate information about the impedance match and the amount of power being reflected.

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  • 21. 

    The ability of an antenna to receiver as well as transmit effectively is called

    • Fidelity

    • Capacity

    • Reciprocity

    • Transquality

    Correct Answer
    A. Reciprocity
    Explanation
    Reciprocity refers to the ability of an antenna to both receive and transmit effectively. This means that the antenna can not only pick up signals from other devices but also send out signals to communicate with them. It is an important characteristic for antennas in various communication systems as it ensures bidirectional communication. Fidelity refers to the accuracy of signal reproduction, capacity refers to the amount of data that can be transmitted, and transquality is not a recognized term in the context of antennas.

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  • 22. 

    If an antenna concentrates its signal in one direction while reducing the signal in other directions, it can be classified as

    • Directional

    • Reciprocal

    • Bi-directional

    • Omnidirectional

    Correct Answer
    A. Directional
    Explanation
    An antenna that concentrates its signal in one direction while reducing the signal in other directions is classified as directional. This means that the antenna is designed to transmit or receive signals in a specific direction, providing a focused and concentrated signal in that direction. Unlike omnidirectional antennas that radiate signals in all directions equally, a directional antenna is used when the signal needs to be focused towards a particular target or receiver.

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  • 23. 

    Nonsynchronus orbit satellites are in orbit which is

    • Circular

    • Elliptical

    • Hyperbolic

    • Parabolic

    Correct Answer
    A. Elliptical
    Explanation
    Nonsynchronous orbit satellites are in elliptical orbits. Unlike synchronous orbits where the satellite remains stationary above a fixed point on the Earth's surface, nonsynchronous orbits have varying distances from the Earth at different points in their orbit. This results in an elliptical path rather than a circular, hyperbolic, or parabolic path.

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  • 24. 

    A polar orbit has an inclination of

    • 0 degrees

    • 45 degrees

    • 60 degrees

    • 90 degrees

    Correct Answer
    A. 90 degrees
    Explanation
    A polar orbit is a type of orbit where the satellite passes over or near both the North and South poles of the planet being orbited. This orbit has an inclination of 90 degrees because it is inclined at a right angle to the equator. As a result, the satellite's path will cross the poles during each orbit, allowing it to cover the entire globe. Therefore, a polar orbit has an inclination of 90 degrees.

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  • 25. 

    The distance from your facility to the satellite is the

    • Crossing point

    • Footprint

    • Intercept point

    • Slant range

    Correct Answer
    A. Slant range
    Explanation
    The term "slant range" refers to the distance between a facility and a satellite when measured along the line of sight. It takes into account the elevation angle and the direct path between the two points. In contrast, the other options do not specifically address the distance between the facility and the satellite. Therefore, "slant range" is the most appropriate answer in this context.

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  • 26. 

    An advantage of passive satellites is that they

    • Have a larger transmitter power

    • Have a larger antenna system

    • Have more sensitive equipment

    • Operate over a wider-frequency range

    Correct Answer
    A. Operate over a wider-frequency range
    Explanation
    Passive satellites have the advantage of operating over a wider-frequency range. This means that they are capable of receiving and transmitting signals across a broader range of frequencies. This versatility allows them to be used for various purposes and applications, making them more flexible and adaptable in different communication scenarios. By operating over a wider-frequency range, passive satellites can accommodate a greater range of communication needs and provide more comprehensive coverage.

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  • 27. 

    What is the delay of a real-time satellite?

    • 0. 1 seconds

    • 0.6 seconds

    • 1.0 seconds

    • 6.0 seconds

    Correct Answer
    A. 0.6 seconds
    Explanation
    The delay of a real-time satellite is 0.6 seconds. This means that there is a slight delay in the transmission of signals between the satellite and the ground station. This delay is due to the time it takes for the signals to travel back and forth between the satellite and the ground station, as well as any processing time required.

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  • 28. 

    In a Demand Assigned Multiple Access (DAMA) system, which functions as the network control station (NCS)?

    • Only a network management system (NMS) outside of the satellite’s footprint

    • The central network control station(CNCS) at Andrews AFB, MD

    • Any remote unit possessing the appropriate hardware and software

    • The network control element (NCE) at Andrews AFB, MD

    Correct Answer
    A. Any remote unit possessing the appropriate hardware and software
    Explanation
    In a Demand Assigned Multiple Access (DAMA) system, the network control station (NCS) is not limited to a specific location or entity. Any remote unit that has the necessary hardware and software can function as the NCS. This means that multiple remote units can potentially act as NCS, depending on their capabilities and configuration.

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  • 29. 

    What are the primary missions of the Global Positioning System (GPS)?

    • Navigation and timing transfer

    • Navigation and nuclear detection

    • Position and nuclear detection

    • Position and timing transfer

    Correct Answer
    A. Navigation and nuclear detection
  • 30. 

    Because of overlapping frequency ranges, how many wireless LAN's can exist in any one area?

    • 1

    • 2

    • 3

    • 4

    Correct Answer
    A. 3
    Explanation
    Wireless LANs operate on different frequency ranges, such as 2.4 GHz and 5 GHz. These frequency ranges have overlapping channels, which means that they can interfere with each other if multiple wireless LANs are operating in close proximity. However, to minimize interference, it is recommended to have a gap of at least three non-overlapping channels between wireless LANs. Therefore, in any one area, it is ideal to have a maximum of three wireless LANs to ensure minimal interference and optimal performance.

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  • 31. 

    Which conventional LMR device serves as the hub of a net?

    • Portable

    • Mobile

    • Repeater

    • Base station

    Correct Answer
    A. Base station
    Explanation
    A base station is a conventional LMR device that serves as the hub of a network. It acts as a central communication point, connecting multiple portable and mobile devices within the network. The base station provides a wide coverage area and facilitates communication between different devices, allowing them to transmit and receive signals effectively. It plays a crucial role in establishing and maintaining communication within the network.

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  • 32. 

    How many squadrons and detachments does JCSE have?

    • Four squadrons and one detachment

    • Four squadrons and two detachment

    • Five squadrons and one detachment

    • Five squadrons and two detachment

    Correct Answer
    A. Five squadrons and one detachment
    Explanation
    The correct answer is five squadrons and one detachment. This means that JCSE has a total of five squadrons and one additional detachment.

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  • 33. 

    Which career fields ar assigend to a special operations communications flight?

    • Air traffical control and landing systems

    • Radio operations and maintenance

    • Computer networking

    • Visual intrusion detection systems

    • Octocamo design

    Correct Answer
    A. Radio operations and maintenance
    Explanation
    The career fields assigned to a special operations communications flight are radio operations and maintenance. This involves the operation and maintenance of radio equipment and systems used for communication within the special operations unit. It includes tasks such as setting up and maintaining radio networks, troubleshooting communication issues, and ensuring the proper functioning of radio equipment.

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  • 34. 

    For successful communications to take place, the transmitter's carrier output must be

    • Relatively rich in harmonics

    • Transmitted in a specific direction

    • Relatively stable in a frequency and amplitude

    • Attenuated to prevent overdriving the reciever output

    Correct Answer
    A. Relatively stable in a frequency and amplitude
    Explanation
    For successful communications to take place, the transmitter's carrier output must be relatively stable in a frequency and amplitude. This is because a stable carrier frequency ensures that the receiver can accurately detect and demodulate the transmitted signal. Any fluctuations or instability in the frequency or amplitude of the carrier signal can lead to distortion or loss of the transmitted information. Therefore, stability in frequency and amplitude is crucial for maintaining the integrity and reliability of the communication signal.

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  • 35. 

    Referring to foldout 2, what determines which specific filter is used in the IF FILTER Assembly?

    • An error voltage generated from the TGC circuitry

    • Front-Panel LPF selector switch

    • The balanced modulator

    • The mode of operation

    Correct Answer
    A. The mode of operation
    Explanation
    The mode of operation determines which specific filter is used in the IF FILTER Assembly. The different modes of operation may require different filter settings to achieve the desired signal processing. Therefore, the mode of operation plays a crucial role in determining which filter is used.

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  • 36. 

    The primary limitin factor concerning use of waveguides at lower frequencies is

    • Arcing would be sustantial at the lower frequencies

    • High loss due to the increases capacitive reactance

    • The need for increased amplification

    • Physical size

    Correct Answer
    A. Physical size
    Explanation
    The primary limiting factor concerning the use of waveguides at lower frequencies is the physical size. As the frequency decreases, the wavelength increases, and this requires larger waveguide dimensions to accommodate the longer wavelengths. However, practical constraints such as space limitations can make it difficult to implement waveguides of sufficient size at lower frequencies. Therefore, the physical size becomes a significant limitation in using waveguides at lower frequencies.

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  • 37. 

    Which statement concerning waveguides is FALSE?

    • Very slight damage to the internal surface of a waveguide can cause arcing

    • The flexible nature of waveguides make them easy to install

    • Effectiveness of waveguides is hindered by moisture

    • Waveguides can be destroyed by corrosion

    Correct Answer
    A. The flexible nature of waveguides make them easy to install
    Explanation
    Flexible waveguides are not necessarily easy to install. In fact, the flexibility of waveguides can make them more challenging to install compared to rigid waveguides. Flexible waveguides require careful handling and positioning to ensure proper alignment and connection. Therefore, the statement that the flexible nature of waveguides makes them easy to install is false.

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  • 38. 

    What is the maximum raw data rate fir the 802.11b standard?

    • 1Mbit/s

    • 6Mbit/s

    • 11Mbit/s

    • 54Mbit/s

    Correct Answer
    A. 11Mbit/s
    Explanation
    The maximum raw data rate for the 802.11b standard is 11Mbit/s. This standard was introduced in 1999 and operates in the 2.4 GHz frequency range. It uses direct-sequence spread spectrum (DSSS) modulation technique to transmit data wirelessly. The 11Mbit/s data rate refers to the maximum speed at which data can be transmitted over a wireless connection using this standard.

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  • 39. 

    What is the net throughput of 802.11g standard?

    • 2Mbit/s

    • 11Mbit/s

    • 24.7Mbit/s

    • 54Mbit/s

    Correct Answer
    A. 24.7Mbit/s
    Explanation
    The net throughput of the 802.11g standard is 24.7Mbit/s. This standard is capable of providing a maximum data rate of 54Mbit/s, but due to various factors such as interference and overhead, the actual net throughput is lower. In this case, it is 24.7Mbit/s.

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  • 40. 

    Which missle site antenna is considered dual-mode and is used by both unltra high frequency (UHF) voice and the AFSATCOM system?

    • ISST UHF transmit antenna

    • ISST UHF receive antenna

    • Hard UHF antenna

    • SLFCS antenna

    Correct Answer
    A. Hard UHF antenna
    Explanation
    The Hard UHF antenna is considered dual-mode and is used by both ultra high frequency (UHF) voice and the AFSATCOM system.

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  • 41. 

    What are the three steps of the ALE linking sequence?

    • Call, response, and acknowledgment

    • Call, request, and acknowledgment

    • Sound, handshake, response

    • Sound, call and response

    Correct Answer
    A. Call, response, and acknowledgment
    Explanation
    The three steps of the ALE linking sequence are call, response, and acknowledgment. This means that the process begins with a call, which is a request or signal for communication. The recipient then responds to the call, indicating that they have received and understood the message. Finally, an acknowledgment is given to confirm that the communication has been successfully established.

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  • 42. 

    What is the output of the SCOPE Command power amplifier (PA)?

    • 500 Watts

    • 2000 Watts

    • 4000 Watts

    • 5000 Watts

    Correct Answer
    A. 4000 Watts
    Explanation
    The output of the SCOPE Command power amplifier (PA) is 4000 Watts.

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  • 43. 

    What AACE communications terminal is a one way paging system?

    • AFSATCOM

    • Klaxon

    • TAAN

    • UHF radios

    Correct Answer
    A. TAAN
    Explanation
    The correct answer is TAAN because TAAN stands for Tactical Airborne Alerting Network, which is a one-way paging system used by the U.S. Air Force. A one-way paging system means that it only allows for the transmission of messages or alerts to the recipients, without the ability for them to respond or communicate back. AFSATCOM, Klaxon, and UHF radios are not specifically mentioned as one-way paging systems in the question.

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  • 44. 

    Hammer ACE systems are securable up to what classification?

    • Confidential

    • Secret

    • Top Secret

    • Unclassified

    Correct Answer
    A. Top Secret
    Explanation
    Hammer ACE systems are securable up to the Top Secret classification. This means that the systems have the necessary security measures in place to protect information that is considered highly sensitive and could cause severe damage to national security if accessed by unauthorized individuals.

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  • 45. 

    What is the frequency range of the AN/PRC-148

    • 116 - 149.975 MHZ

    • 225 - 399.975 MHZ

    • 400 - 512 MHZ

    • 30 - 512 MHZ

    • 2 - 30 MHZ

    Correct Answer
    A. 30 - 512 MHZ
    Explanation
    The correct answer is 30 - 512 MHZ. This frequency range represents the operating range of the AN/PRC-148, which is a handheld radio commonly used by military personnel. This range allows for communication over a wide range of frequencies, making it versatile and suitable for various operational needs.

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  • 46. 

    In what section of a super heterdyne reciever does most of the amplification take place?

    • IF section

    • RF amplifier

    • Audio amplifier

    • Input tuning tuning section

    Correct Answer
    A. IF section
    Explanation
    In a super heterodyne receiver, the IF (Intermediate Frequency) section is where most of the amplification takes place. This section amplifies the signal after it has been mixed with a local oscillator frequency, allowing for better selectivity and sensitivity. The RF amplifier amplifies the incoming radio frequency signal, the audio amplifier amplifies the audio output, and the input tuning section is responsible for tuning the receiver to the desired frequency. However, it is the IF section that primarily handles the amplification of the signal in a super heterodyne receiver.

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  • 47. 

    Which of the following identifies the output power of the AN/GRC-171B(V)4?

    • 25 Watts in both AM and FM

    • 20 Watts in AM, 50 Watts in FM

    • 20 Watts in AM, 20 Watts in FM

    • 50 Watts in narrowband, 25 Watts in wideband

    Correct Answer
    A. 20 Watts in AM, 50 Watts in FM
    Explanation
    The correct answer is 20 Watts in AM, 50 Watts in FM. This means that the AN/GRC-171B(V)4 has an output power of 20 Watts when operating in AM (Amplitude Modulation) mode and 50 Watts when operating in FM (Frequency Modulation) mode.

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  • 48. 

    If an out-of-tolerance condition is detected during a self-test on the AN/GRC-171B(V)4 the

    • Fault lamp illuminates

    • Transceiver powers down

    • Safety interlock energizes

    • Unit switches to low-power mode

    Correct Answer
    A. Fault lamp illuminates
    Explanation
    When an out-of-tolerance condition is detected during a self-test on the AN/GRC-171B(V)4, the fault lamp illuminates. This means that there is a problem or fault with the transceiver. The fault lamp serves as a visual indicator to alert the user that there is an issue that needs to be addressed. It does not necessarily indicate that the transceiver will power down, that a safety interlock will energize, or that the unit will switch to low-power mode.

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  • 49. 

    The path above the horizon through which an antenna radiates the largest amount of its RF energy is called the

    • Skip angle

    • Escape angle

    • Radiation angle

    • Critical frequency angle

    Correct Answer
    A. Radiation angle
    Explanation
    The path above the horizon through which an antenna radiates the largest amount of its RF energy is called the radiation angle. This angle determines the direction in which the antenna's energy is focused and transmitted. By adjusting the radiation angle, the antenna can effectively target a specific area or receive signals from a particular direction. The skip angle refers to the angle at which radio waves are refracted back to Earth, allowing for long-distance communication. The escape angle and critical frequency angle are not relevant to the concept of antenna radiation.

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  • Apr 20, 2023
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    ProProfs Editorial Team
  • Mar 31, 2009
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