B3 Flashcards
ID the frequency range of the SINCGARS
SINCGARS operates with Frequency Modulation (FM) in the VHF spectrum from 30 MHz to 87.975 MHz
ID the 4 requirements to operate a radio in frequency hopping mode
- HOPSET
- Transmission Security Key (TSK)
- Time
- Net ID
(Traffic Encryption Key (TEK) is also included in FH data, but not strictly required IOT operate in FH mode)
Given a SINCGARS configuration, ID the power requirements
@PRC-119A:
- Main battery power. One of the following:
- BA-5590 (non-rechargeable lithium-ion)
- BB-390 (rechargeable nickel)
- BB-590 (rechargeable nickel-cadium)
- Hold-Up Battery (HUB)
- BA-5372 (non-rechargeable lithium-ion)
- Cannot power radio on its own
@PRC-119F: Identical PRC-119A
@All vehicle SINCGARS configs:
- 22-32 VDC
- Standard power available from batteries of all HMMWV variants
- Also require a HUB
Given a SINCGARS vehicle configuration, identify the equipment nomenclature
VRC-87: One short range radio VRC-88: One short range radio Dismount capable VRC-89: One short range radio One long range radio VRC-90: One long range radio VRC-91: One short range radio One long range radio VRC-92: Two long range radios rtx cable??? MRC-145: Two long range radios
ID the principle mission of the AN/MRC-145
Retransmission of VHF nets
ID the difference between AN/MRC-145 and AN/VRC-92
Both a vehicle and retransmission cable come SL-3 with MRC-145
- ID the power outputs of multi-band radios
- ID the frequency ranges of multi-band radios
- ID the operational modes of multi-band radios
PICTURE
Given a radio configuration, associate the man-pack multi-band radio to its vehicle configuration
Man-pack- Vehicle Equivalent PRC-117F-VRC-103 PRC-117G-VRC-114 PRC-152-VRC-110 PRC-148-VRC-111
ID the 3 major components of a satellite
- Transceiver
- Antenna
- Source of power generation
ID the definition of a satellite’s footprint
- Area of communication coverage on the earth’s surface.
- It is the portion of the Earth that is effectively irradiated by that antenna and is determined by the type of orbit and the antenna’s directionality and size.
- It is the area with which a satellite can communicate.
ID the type of orbit predominately used with communications satellites
Geostationary
ID the 3 segments of a typical satellite communication system
- Space segment
- Ground segment
- Control segment
ID the advantages of satellite communications
- Satellite links are unaffected by the propagation variations that interfere with HF radio
- Free from high attenuation of wire or cable facilities
- Capable of spanning long distances
- Higher bandwidth links with higher fidelity
- Not dependent upon reflection/refraction
- Only slightly affected by atmospheric phenomena
- Destruction of a single satellite would be difficult and expensive
- High degree of freedom from jamming
- Lower probability of both detection and interception
ID the 2 single channel radio tactical satellite bandwidths/waveforms most commonly used with USMC multi-band radios
- 5 kHz
- 25 kHz
ID the purpose of Demand Assigned Multiple Access (DAMA) operation
Increase loading of limited SATCOM channels by assigning channels as needed by terminal users for their communication needs
Select from a list of distractors the 2 addresses required for Demand Assigned Multiple Access operation
- Terminal base address
- Network address
ID the characteristics of Time Division Multiple Access (TDMA)
- Divides the signal into different time slots. The users transmit in rapid succession, one after the other, each using their own time slot
- TDMA is the channel access method used with DAMA
ID the characteristics of Frequency Division Multiple Access (FDMA)
- FDMA gives users an individual allocation of one or several entire frequency bands within a channel
- Provides users a small amount of bandwidth all of the time
ID the purpose of retransmission
Extends single channel communications around obstacles and across increased distances
- Increase distance
- Overcome obstacle
ID the 2 types of retransmission
- Automatic
2. Manual
ID the 3 modes of retransmission capable in the SINCGARS radio system
- Frequency Hop to Frequency Hop
- Frequency Hop to Single Channel
- Single Channel to Single Channel
ID the modes of retransmission capable in the different USMC multiband radios
- VHF/UHF SC
- Dedicated SATCOM
- FH
ID the characteristics of the J-1077 Junction Box
- Two CX-4566 connections
- 26 binding post pairs
ID the 2 most common guided media used to extend services from antenna hill to the COC
- CX-4566
- WD-1A/TT
