CDC 2e153 Ground Radio Communications Journeyman

Active and passive are the two types of communication satellites. Active satellites are equipped with onboard electronic systems that amplify and retransmit the received signals, allowing for stronger and clearer communication. They are capable of receiving, processing, and transmitting signals independently. On the other hand, passive satellites do not have onboard electronic systems and rely on reflecting or redirecting signals from the ground to the desired location. They act as a relay station, bouncing signals from one point to another without amplifying or altering them.

Passive satellites reflect signals transmitted toward them. Unlike active satellites, which generate and transmit their own signals, passive satellites rely on external signals for communication. These satellites act as mirrors, reflecting the signals back to Earth. This makes them useful for various applications, such as communication, weather monitoring, and navigation systems.

When a communications link is established using Demand Assigned Multiple Access (DAMA), the circuit remains active only as long as needed. This means that once the communication is completed, the circuit is released and made available for other users. Unlike other options that suggest the circuit remains active indefinitely or until someone else requests a channel, DAMA ensures efficient use of resources by activating and deactivating the circuit based on the actual need for communication. The duration of the circuit is not directly proportional to the bandwidth, as suggested by the last option, but rather depends on the specific communication requirements.

INMARSAT, also known as the International Maritime Satellite Organization, was originally developed in 1979 for ship management and distress and safety applications. It provides satellite communications services to the maritime industry, including voice, data, and internet connectivity, as well as search and rescue services. INMARSAT plays a crucial role in ensuring the safety and efficiency of maritime operations worldwide.

A Bluetooth master device can support a maximum of 7 devices. This is because Bluetooth technology uses a frequency-hopping spread spectrum technique, where it rapidly switches between different frequencies to avoid interference. Each Bluetooth connection requires a specific frequency channel, and there are only 79 available channels. Therefore, a master device can support up to 7 simultaneous connections, as it needs one channel for its own communication.

A repeater is a conventional LMR device that maximizes the communication distance between low-powered equipment. It receives weak signals from portable or mobile devices and amplifies and retransmits them, effectively extending the range of communication. This allows for better coverage and stronger signals in areas with poor reception or long distances between devices. A repeater acts as a relay station, enhancing the overall communication distance for low-powered equipment.

CDMA stands for Code Division Multiple Access, which is a cellular telephone technology that uses "spread spectrum" to transmit and receive signals. Spread spectrum is a technique that spreads the signal over a wide frequency range, allowing multiple users to share the same frequency band simultaneously. CDMA uses unique codes to differentiate between different users, enabling efficient use of the available bandwidth. This technology is used in many modern cellular networks for its ability to provide increased capacity and improved call quality.

The ALE circuitry automatically tests several channels and selects the clearest one for communication. This means that the system is able to assess the quality of different channels and choose the one with the least interference or noise for transmitting data. By doing so, it ensures that the communication is clear and reliable.

When the SCOPE Command station links with a station that is not preprogrammed into the other-station address listing, the address of this other station is stored as a floating address. This means that the address is temporarily saved in the system's memory until the Link Quality Analysis (LQA) can be performed. Once the LQA is accomplished, the address will either be saved as a permanent address or deleted if it fails the LQA.

The protocol used for all communications between SCOPE command software processors is TCP/IP. TCP/IP is a widely used protocol suite that enables communication over networks, including the internet. It provides reliable, connection-oriented communication between devices, allowing for the exchange of data packets. In the context of SCOPE command software processors, TCP/IP facilitates the transmission of commands, data, and information between these processors, ensuring efficient and secure communication.

The NSA, or National Security Agency, is responsible for Signal Intelligence. This means that they gather and analyze information from various sources, such as intercepted communications and electronic signals, to gain insights into potential threats to national security. This includes monitoring and deciphering encrypted messages, tracking the activities of foreign governments and organizations, and providing intelligence to support military operations and decision-making.

The image frequency is calculated by adding or subtracting the intermediate frequency (IF) from the operating frequency. In this case, since the IF is 10.7MHz, the image frequency would be 150MHz + 10.7MHz = 160.7MHz. Therefore, the correct answer is 171.4MHz, as it is the closest option to the calculated image frequency.

Diode detectors give high fidelity detection for signals of sufficient amplitude. This means that they are able to accurately detect and reproduce the original signal when the amplitude is strong enough. Unlike other options, diode detectors are not described as complex devices or devices that can only handle small signals. Additionally, there is no mention of diode detectors providing a tremendous amount of power gain, so this option can be ruled out.

The purpose of the Input Overload Protection Circuit is to prevent any receiver damage due to excessively strong signals. This circuit is designed to detect and limit the strength of incoming signals to protect the receiver from being overwhelmed by high-power inputs. By controlling the signal strength, the circuit ensures that the receiver operates within safe limits and prevents any potential damage that could be caused by excessively strong signals.

When a transmission line is terminated in an open, it means that the line is not connected to any load or receiver. In this scenario, the signal that is being transmitted along the line will encounter a high impedance at the open termination. This high impedance mismatch causes a significant portion of the signal to be reflected back towards the source, resulting in signal loss. Therefore, the correct answer is that there would be significant signal loss.

A Demand Assigned Multiple Access (DAMA) system allows for efficient allocation of satellite resources by dynamically assigning channels to users on demand. This system optimizes the use of transponders, enabling them to support a large number of subscribers. Therefore, a single transponder using a DAMA system can support several thousand subscribers.

The minimum output power of the UHF radio system is 100 Watts. This means that the radio system is capable of producing a minimum power output of 100 Watts.

The Air Force Thunderbirds belong to the Air Combat Command. This command is responsible for organizing, training, and equipping combat-ready forces for air, space, and cyberspace operations. The Thunderbirds are the Air Force's premier aerial demonstration team, showcasing the skill and precision of their pilots through breathtaking aerial maneuvers and formations. They perform at air shows and events across the United States and around the world, representing the Air Force and demonstrating the capabilities of its aircraft.

The output power at the transmit site is 4000 watts. This means that the transmit site is capable of generating and transmitting 4000 watts of power.

Overmodulating increases bandwidth due to the production of harmonics. When a signal is overmodulated, the amplitude of the carrier wave is increased beyond its normal range. This results in the production of harmonics, which are additional frequencies that are multiples of the original signal frequency. These harmonics occupy additional bandwidth, leading to an increase in the overall bandwidth of the signal.

The resistance of the conductor material in a transmission line leads to copper loss. Copper loss occurs due to the resistance of the copper wire used in the transmission line. When current flows through the conductor, it encounters resistance, which results in the conversion of electrical energy into heat. This heat is known as copper loss. It is an important factor to consider in power transmission systems as it can cause inefficiencies and decrease the overall efficiency of the transmission line.

When a transmission line is terminated in a short, it means that the line is connected to a load with very low impedance. In this case, the current flowing through the line will be at a maximum because the low impedance allows for a large amount of current to flow. On the other hand, the voltage at the termination will be at a minimum because the low impedance causes a voltage drop across the load. Therefore, the correct answer is that the current is at a maximum and the voltage is at a minimum at the termination.

The AN/PRC-117F has 100 programmable net presets. This means that it can store and recall up to 100 different network configurations, allowing for quick and easy switching between different communication settings. This feature is particularly useful in military operations where there may be a need to rapidly switch between different networks or frequencies. Having a large number of presets ensures that the device is versatile and can adapt to various communication requirements.

AFSPC, which stands for Air Force Space Command, is responsible for organizing, training, and equipping forces for space and cyberspace missions. The command has four primary missions: space superiority, space support, space situational awareness, and space control. These missions involve activities such as protecting and defending space assets, providing support to military operations, monitoring and tracking space objects, and ensuring the ability to deny adversaries' use of space capabilities.

The Minuteman MEECN Program consists of two communication systems: EHF MILSTAR and VLF/LF. EHF MILSTAR stands for Extremely High Frequency Military Strategic and Tactical Relay, which is a satellite communication system used for secure and high-capacity transmission of data. VLF/LF refers to Very Low Frequency/Low Frequency communication systems, which use low-frequency radio waves to communicate over long distances. Together, these two systems provide a comprehensive communication network for the Minuteman MEECN Program.

The technical order states that the transmitter has a frequency accuracy of 0.0001 percent. This means that the acceptable range for the operating frequency can deviate by 0.0001 percent from the specified frequency of 225MHz.

To calculate the acceptable range, we can multiply 225MHz by 0.0001 percent (0.0001/100 = 0.000001) to find the deviation.

225MHz * 0.000001 = 0.000225MHz

Therefore, the acceptable range for the operating frequency is from 225MHz - 0.000225MHz to 225MHz + 0.000225MHz, which is 224.999775MHz to 225.000225MHz.

Thus, the correct answer is 224.999975MHz to 225.000225MHz.

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When discussing transmission lines, maximum power transfer actually results from a resonant line, not a non-resonant line. Using a non-resonant line can lead to significant loss and damage to equipment.

Log Periodic antennas exhibit essentially constant characteristics over the entire frequency range. This means that the antenna's performance remains consistent and predictable regardless of the frequency being used. This is an important feature in many applications, as it allows for reliable and accurate communication or direction-finding.

When the speed of a satellite is constant, the only orbit that can be maintained is a circular orbit. In a circular orbit, the satellite moves at a constant speed around the central body, such as the Earth, in a perfect circle. This is because the gravitational force acting on the satellite is balanced by the centripetal force, resulting in a stable orbit. In contrast, elliptical, hyperbolic, and parabolic orbits require varying speeds for the satellite to maintain its trajectory, making them incompatible with a constant speed.

The Bluetooth protocol changes channels 1600 times per second. This high frequency of channel changes allows for efficient and reliable communication between Bluetooth devices. By rapidly switching channels, Bluetooth can avoid interference from other devices operating in the same frequency range, ensuring a stable connection and minimizing data loss.

A dispatch console has the ability to patch different talk groups together. This means that it can connect and merge multiple talk groups into one communication channel. This feature is crucial in emergency situations or large-scale operations where different teams or groups need to coordinate and communicate effectively. The dispatch console acts as a central hub for managing and controlling communication between different parties, allowing for seamless and efficient collaboration.

The UHF radios in the AACE communications terminal are set at the frequencies of 311 and 321 MHz.

The White House Communications Agency provides worldwide audiovisual, voice, and data communications to support the President. This agency is responsible for ensuring secure and reliable communication between the President, White House staff, and other government officials. They play a crucial role in coordinating and facilitating communications during the President's travels and in the White House itself.

When modulation is reduced to less than 100 percent, it means that the amplitude of the carrier signal is not affected by the modulating signal. In this case, the carrier power remains unchanged because the carrier signal is not being altered or attenuated in any way. The reduction in modulation only affects the sideband power, which is the power carried by the modulating signal. Therefore, there is no reduction in carrier power.

The IF filter in a receiver determines overall selectivity. The IF filter is responsible for filtering out unwanted signals and noise, allowing only the desired signals to pass through. It helps in improving the receiver's ability to select and separate different frequencies, ensuring better signal quality and reducing interference. The IF filter plays a crucial role in determining the selectivity and performance of the receiver.

The amount of skin-effect loss is directly proportional to the signal frequency. Skin effect is a phenomenon where high-frequency currents tend to flow near the surface of a conductor, resulting in increased resistance and power loss. As the frequency of the signal increases, the skin depth decreases, causing more current to concentrate near the surface and leading to higher skin-effect loss. Therefore, the higher the signal frequency, the greater the skin-effect loss.

The statement that wavelength is inversely related to frequency is true. This is based on the fundamental relationship between wavelength and frequency in wave phenomena, such as electromagnetic waves. According to this relationship, as the frequency of a wave increases, its wavelength decreases, and vice versa. This can be explained by considering that wavelength represents the distance between two consecutive points of a wave, while frequency represents the number of complete wave cycles that pass a given point in one second. Therefore, when the frequency increases, more wave cycles occur in a given time, resulting in a shorter wavelength.

A nonresonant transmission line is a line that does not have any reflected waves. This means that all the energy sent through the line is transmitted without any portion of it being reflected back. In other words, the line is perfectly matched, with the impedance of the line and the load being the same. As a result, there are no reflections and the entire input power is delivered to the load.

INMARSAT series satellite 3 was the first to concentrate power on particular areas of high traffic within the footprint.

The item "stand-alone" is not a type of wireless LAN infrastructure because it does not involve the connection of multiple devices to form a network. Stand-alone refers to a single device that operates independently without the need for any other devices or infrastructure. In contrast, ad-hoc, infrastructure, and peer-to-peer are all types of wireless LAN infrastructures that involve the connection and communication between multiple devices.

The SCOPE Command RF loop-back testing is not designed to indicate how well the station communicates with a distant station. It is a test conducted utilizing only local equipment. The purpose of the test is to evaluate the performance of the station's own RF transmission and reception capabilities, rather than its ability to communicate with a distant station. The test is conducted three times to ensure accurate and consistent results, but it does not measure the station's communication with a distant station.

The reason the Department of Defense (DOD) has an issue with wireless LANs is due to insecurity. Wireless LANs are vulnerable to security breaches and unauthorized access, which poses a significant risk for sensitive information and communications within the DOD. Therefore, the DOD is concerned about the lack of security in wireless LANs and the potential threats they pose to their infrastructure and operations.

The question is asking which UTC (Unit Type Code) is not part of the Theater Acromedical Evacuation system. The correct answer is CRG/CRE. This means that the CRG/CRE UTC is not included in the Theater Acromedical Evacuation system.

The AN/PRC-148 is a multiband inter/intra radio. This means that it is capable of operating on multiple frequency bands, both within a single radio network and between different radio networks. This flexibility allows for communication across different radio systems, making it a versatile and adaptable radio device.

The correct answer is using a 600-ohm transmission line. This means that when using the C-11329 Remote Control Unit, the transmit audio is routed to the RT-1446 through a 600-ohm transmission line. This type of transmission line is commonly used for audio signals and provides a balanced connection for better signal quality and noise rejection.

When using the CU-2310 antenna coupler, a VSWR exceeding 2 causes the keying circuit to be disabled and the tuning cycle must be repeated. This means that if the VSWR (Voltage Standing Wave Ratio) exceeds 2, there is a mismatch between the antenna and the transmission line, which can cause damage to the equipment. In order to prevent any potential damage, the keying circuit is disabled and the tuning cycle must be repeated to ensure proper matching between the antenna and the transmission line.

A Global Positioning System (GPS) receiver needs timing signals from a minimum of four satellites to calculate its position. This is because each satellite provides a signal that includes its precise location and the time the signal was transmitted. By receiving signals from at least four satellites, the GPS receiver can use the time delay between when each signal was transmitted and when it was received to calculate the distance to each satellite. With this information, the receiver can then triangulate its position accurately.

Class 2 is the most common Bluetooth power class. This class has a range of up to 10 meters and is commonly used in most consumer devices like smartphones, tablets, and laptops. Class 1, on the other hand, has a range of up to 100 meters and is typically found in professional or industrial devices. Class 3 and Class 4 have even shorter ranges and are less common in everyday devices.

A portable LMR device is the correct answer because it is a conventional device that can be carried and used on the go. It typically has a lower transmit power compared to other LMR devices like mobile, repeater, or base station. The transmit power of 5 or 6 watts is commonly found in portable LMR devices, making it the most suitable option.

A trunked mobile radio can monitor only one talk group at a time. This means that it can only receive and transmit communications from one specific group of users within the trunked radio system. It cannot simultaneously monitor multiple talk groups or all the talk groups programmed in the radio.

Air Mobility Command is a component of the US Transportation Command. The US Transportation Command is responsible for providing transportation and logistical support to the US military, including the movement of personnel, equipment, and supplies. Air Mobility Command specifically focuses on providing air transportation capabilities, such as airlift and aerial refueling, to support military operations worldwide.

The wavelength of a wave is inversely proportional to its frequency. As the frequency increases from 150MHz to 250MHz, the wavelength decreases. This is because higher frequencies have shorter wavelengths. Therefore, the correct answer is 1.2 meters, which is the shortest wavelength among the given options.

The AN/PSN-11 selects satellites during initial acquisition with a minimum elevation angle of 10 degrees. This means that the system will only consider satellites that are above the horizon by at least 10 degrees when establishing a connection. This minimum elevation angle helps ensure a clear line of sight between the AN/PSN-11 and the satellite, reducing potential signal interference or obstructions.

The additional accessory that the purchaser must buy when procuring Iridium handheld terminals is the Iridium security module.

AACE stands for Airborne Alert Communications Equipment. This system provides communications between a Command Post operator and alert aircrew personnel. It is specifically designed for use in airborne alert missions, ensuring effective communication between the command post and the aircrew members who are on alert and ready to respond to any emergency or mission. The AACE system enables real-time communication and coordination, allowing the command post operator to provide updates, instructions, and receive status reports from the alert aircrew personnel.

LMR stands for Land Mobile Radio, which is a type of communication system commonly used by public safety agencies, such as police and fire departments. LMR equipment provides secure intra-site communication, meaning it allows communication within a specific location or site. Unlike cell phones, which can be accessed by the general public and media, LMR systems are typically used for private and secure communication between authorized personnel. Therefore, LMR is the correct answer for providing secure intra-site communication from the media and the public.

Using a very high-resistance dielectric in a transmission line can minimize leakage loss. Leakage loss occurs when some of the electrical energy being transmitted through the line is lost as heat due to leakage currents. By using a high-resistance dielectric, the leakage currents are reduced, resulting in lower energy losses. This allows for more efficient transmission of electrical energy through the line, minimizing the overall leakage loss.

The correct answer is AECS. The Aeromedical Evacuation Support Cell (AECS) is responsible for reporting to the higher authorities regarding aeromedical evacuations. This cell plays a crucial role in coordinating and supporting the transportation of patients in need of medical care. They ensure that all necessary arrangements and resources are in place for safe and efficient evacuations.

CSU/DSU stands for Channel Service Unit/Data Service Unit, and it is the correct answer because both ends of a T1 or T3 connection require this communication system. CSU/DSU is responsible for converting digital data from the user's equipment into a format suitable for transmission over the T1 or T3 line, and vice versa. It also performs line monitoring and conditioning functions to ensure reliable communication. Therefore, CSU/DSU is essential for establishing and maintaining a T1 or T3 connection.

Demodulation is the process of extracting the original information signal from a modulated carrier signal. Sensitivity is required to accurately detect and interpret the weak modulated signal. Nonlinearity is necessary to convert the modulated signal back to its original form. The RF carrier signal is needed as a carrier wave for the modulation process. Filtering is essential to remove any unwanted noise or interference from the demodulated signal. Therefore, the basic requirements for any type of demodulation include sensitivity, nonlinearity, RF carrier signal, and filtering.

The correct answer is 4 because the question asks for the number of 7-level technicians in the Aeromedical Evacuation Support Cell. Out of the given options, 4 is the only number that matches the requirement.

The correct answer is HF & MILSTAR systems. The MMP (Mobile Microwave Package) includes two communication systems: HF (High Frequency) and MILSTAR. HF systems operate in the high frequency range and are commonly used for long-distance communication. MILSTAR (Military Strategic Tactical and Relay) is a satellite communication system used by the U.S. military for secure and reliable communication. Both of these systems play a crucial role in the MMP.

Modulation is the process of varying a carrier signal in order to transmit information. In order for modulation to take place, several elements must be present. A reference signal is needed as a baseline for comparison. A modulating signal is required to carry the information that needs to be transmitted. Nonlinearity is necessary to mix the carrier signal with the modulating signal, creating sidebands that carry the information. Lastly, filtering is needed to remove any unwanted frequencies and ensure that the modulated signal is clean and ready for transmission. Therefore, the correct answer is "A reference signal, a modulating signal, nonlinearity, and filtering".

With a constant physical length, the frequency and electrical length are directly related. This means that as the frequency increases, the electrical length also increases, and vice versa.

The master control station provides C2 (command and control) operations for the space segment. It is responsible for monitoring and controlling the various satellites in space. This includes tasks such as tracking their positions, adjusting their orbits, and managing their communications. The master control station acts as the central hub for managing and coordinating the operations of the space segment.

VOX stands for Voice Operated eXchange. It is a method of keying used by SCOPE Command's digital electronic switch (DES) when a circuit is a phone patch. VOX allows the circuit to automatically switch between transmit and receive modes based on the presence or absence of audio input. This means that when someone speaks into the phone, the circuit will automatically switch to transmit mode, and when there is no audio input, it will switch to receive mode. This eliminates the need for manual keying or using a foot-switch, making communication more convenient.

20th Air Force is responsible to US Strategic Command. US Strategic Command is one of the eleven unified combatant commands of the United States Department of Defense. It is responsible for the global command and control of U.S. strategic forces to meet national security objectives. The command oversees strategic deterrence, global strike, and operating the country's nuclear arsenal.

The AN/PRC-148 is used for ground base defense and line of sight communications.

The A& module's low pass filter performs the function of rejecting image frequencies in the receive mode and attenuating harmonics in the transmit mode. This means that it helps to eliminate unwanted frequencies that can interfere with the desired signal during reception, and it also reduces the presence of harmonics that may be generated during transmission.

The correct answer is 15. The SCOPE command HFGCS refers to the High Frequency Global Communications System, which is a network of stations used for long-range military communications. The system consists of 15 stations strategically located around the world to provide coverage and ensure reliable communication for military operations.

The remote message processing subsystem (RMPS) is the correct answer because it enables the monitor and control of MMP, AFSATCOM, and SACDIN directly from the console. The RMPS is responsible for processing and managing messages between different components of the missile site, allowing for efficient communication and control.

The 802.11a standard has the advantage of less interference compared to the other options. This is because it operates on a higher frequency band (5 GHz) which is less crowded and has fewer devices using it. The 802.11b and 802.11g standards operate on the 2.4 GHz frequency band, which is more susceptible to interference from other devices such as microwaves, cordless phones, and Bluetooth devices. The 802.11 legacy standard refers to the original version of the 802.11 standard and does not specify a particular frequency band, so it may have similar interference issues as 802.11b and 802.11g.

The Controller module contains all of the voice/data interfaces to external equipment. This module is responsible for managing and controlling the communication between the system and external devices. It allows for the exchange of voice and data signals between the system and external equipment, enabling seamless communication and integration with other devices. The RF/IF module is responsible for processing radio frequency signals, the COMSEC module handles encryption and decryption of communications, and the Transmitter module is responsible for transmitting signals.

JCSE stands for Joint Communications Support Element, which is a specialized unit responsible for providing communication support to joint military operations. The question asks about the subordinate of JCSE, and the correct answer is USJFC, which stands for United States Joint Forces Command. This makes sense because JCSE is a subordinate unit under the command of USJFC, which is responsible for planning and executing joint military operations.

The mission of Special Operations Communications Flights is to provide secure voice and data communications. This includes line of sight communications, HF, VHF, and UHF capabilities. They also assist the ASOC (Air Support Operations Center) during wartime operations and provide tactical antennas in a deployed environment.

The Joint Staff controls the JCSE.

The AN/PSN-11 can store a total of 15 routes, with each route having 25 legs. This means that the device can store 15 different paths or directions, and each path can consist of 25 different segments or legs.

AESC is the correct answer because it stands for Aerospace Ground Equipment Systems Craftsman. A ground radio maintenance technician in an AE squadron would be responsible for maintaining and repairing aerospace ground equipment systems, which makes AESC the most suitable option for their assigned UTC (Unit Type Code).

The cutoff frequency refers to the lowest frequency that a transmission line can successfully pass. This means that any frequency below the cutoff will be attenuated or blocked by the line, while frequencies above the cutoff will be transmitted through the line without significant loss.

TAES (Theater Aeromedical Evacuation System) has command and control responsibility for all theater AE (Aeromedical Evacuation) elements. This means that TAES is responsible for overseeing and coordinating all aeromedical evacuation operations in the theater of operations. They ensure that patients are transported safely and efficiently from the point of injury or illness to medical facilities, and they manage the logistical and operational aspects of the AE mission. TAES plays a crucial role in providing medical support and ensuring the timely evacuation of injured or sick personnel in a theater of operations.

TACC stands for Tanker Airlift Control Center. It is responsible for planning, scheduling, and executing global air mobility operations. Mobile C2 teams deployed by TACC support strategic and theater air mobility operations, ensuring efficient and effective coordination of tanker and airlift assets. MARC, CRG/CRE, and TAES are not specifically associated with mobile C2 teams or air mobility operations.

An antenna that radiates well in all directions is said to be omnidirectional. This means that the antenna can transmit and receive signals equally well in all directions, providing a 360-degree coverage. On the other hand, a bi-directional antenna is capable of transmitting and receiving signals in two opposite directions, while unidirectional antennas have a focused beam pattern that allows transmission and reception in a specific direction. Quad-directional is not a recognized term in antenna technology.