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Bravo > B3 > Flashcards

B3 Flashcards

1
Q

ID the frequency range of the SINCGARS

A

SINCGARS operates with Frequency Modulation (FM) in the VHF spectrum from 30 MHz to 87.975 MHz

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2
Q

ID the 4 requirements to operate a radio in frequency hopping mode

A
  1. HOPSET
  2. Transmission Security Key (TSK)
  3. Time
  4. Net ID

(Traffic Encryption Key (TEK) is also included in FH data, but not strictly required IOT operate in FH mode)

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3
Q

Given a SINCGARS configuration, ID the power requirements

A

@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
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4
Q

Given a SINCGARS vehicle configuration, identify the equipment nomenclature

A 
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
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5
Q

ID the principle mission of the AN/MRC-145

A

Retransmission of VHF nets

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6
Q

ID the difference between AN/MRC-145 and AN/VRC-92

A

Both a vehicle and retransmission cable come SL-3 with MRC-145

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7
Q
  1. ID the power outputs of multi-band radios
  2. ID the frequency ranges of multi-band radios
  3. ID the operational modes of multi-band radios
A

PICTURE

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8
Q

Given a radio configuration, associate the man-pack multi-band radio to its vehicle configuration

A 
Man-pack- Vehicle Equivalent
PRC-117F-VRC-103
PRC-117G-VRC-114
PRC-152-VRC-110
PRC-148-VRC-111
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9
Q

ID the 3 major components of a satellite

A
  1. Transceiver
  2. Antenna
  3. Source of power generation
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10
Q

ID the definition of a satellite’s footprint

A
  • 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.
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11
Q

ID the type of orbit predominately used with communications satellites

A

Geostationary

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12
Q

ID the 3 segments of a typical satellite communication system

A
  • Space segment
  • Ground segment
  • Control segment
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13
Q

ID the advantages of satellite communications

A
  • 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
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14
Q

ID the 2 single channel radio tactical satellite bandwidths/waveforms most commonly used with USMC multi-band radios

A
  • 5 kHz

- 25 kHz

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15
Q

ID the purpose of Demand Assigned Multiple Access (DAMA) operation

A

Increase loading of limited SATCOM channels by assigning channels as needed by terminal users for their communication needs

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16
Q

Select from a list of distractors the 2 addresses required for Demand Assigned Multiple Access operation

A
  • Terminal base address

- Network address

17
Q

ID the characteristics of Time Division Multiple Access (TDMA)

A
  • 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
18
Q

ID the characteristics of Frequency Division Multiple Access (FDMA)

A
  • 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
19
Q

ID the purpose of retransmission

A

Extends single channel communications around obstacles and across increased distances

  • Increase distance
  • Overcome obstacle
20
Q

ID the 2 types of retransmission

A
  1. Automatic

2. Manual

21
Q

ID the 3 modes of retransmission capable in the SINCGARS radio system

A
  1. Frequency Hop to Frequency Hop
  2. Frequency Hop to Single Channel
  3. Single Channel to Single Channel
22
Q

ID the modes of retransmission capable in the different USMC multiband radios

A
  1. VHF/UHF SC
  2. Dedicated SATCOM
  3. FH
23
Q

ID the characteristics of the J-1077 Junction Box

A
  • Two CX-4566 connections

- 26 binding post pairs

24
Q

ID the 2 most common guided media used to extend services from antenna hill to the COC

A
  • CX-4566

- WD-1A/TT

25
Q

Given a radio system, ID the radio remote control unit used to extend voice services from an antenna hill to a COC

A

RF-5800R:
PRC-150
PRC-117F

RF-7800R-RC:
FALCON II
FALCON III
(All Harris radios in use by the Marine Corps)

AN/GRA-39:
SINCGARS
Harris

C-11561 RCU:
SINCGARS only

RT-1523C/D/E:
SINCGARS only

26
Q

Given a scenario with Equipment Density List, correctly organize the equipment string to extend voice services from antenna hill to a COC

A

Antenna > Coax > Radio > WD-1 > LCU > CX-4566 > RCU > WD-1 > SRCU

Bravo (2 decks)

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