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IP Basic Qualification Board > RF Spectrum > Flashcards

RF Spectrum Flashcards

1
Q

DRAW AND LABEL A SINE WAVE

A

CYCLE

AMPLITUDE

PERIOD

PHASE ANGLE

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2
Q

AMPLITUDE

A

PEAK VALUE OF A WAVE

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3
Q

CYCLE

A

ONE COMPLETE WAVEFORM

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4
Q

PERIOD (T)

A

TIME REQUIRED TO COMPLETE ONE CYCLE.

EXPRESSED IN MILLISECONDS OR MICROSECONDS

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5
Q

WAVELENGTH

A

PHYSICAL LENGTH OF WAVE IN METERS.

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6
Q

FREQUENCY

A

CYCLES PER SECOND

EXPRESSED IN HERTZ (Hz)

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7
Q

VELOCITY (C)

A

SPEED OF LIGHT

3 x 108 m/s

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8
Q

PHASE

A

Using degrees, how much of the period has elapsed

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9
Q

RADIO

A

COMMUNICATION BETWEEN TWO OR MORE POINTS USING ELECTROMAGNETIC WAVES

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10
Q

FREQUENCY x WAVELENGTH =

A

SPEED OF LIGHT

3 x 108 m/s

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11
Q

SIMPLEX

A

COMMS LINK THAT ONLY OPERATES IN ONE DIRECTION

(AM/FM RADIO, FLT BROADCAST, GBS)

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12
Q

HALF DUPLEX

A

COMMS IN TWO DIRECTIONS, ONE AT A TIME.

ONLY ONE CAN TRANSMIT AT A TIME.

(RADIO TELEPHONE)

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13
Q

FULL DUPLEX

A

COMMS IN BOTH DIRECTIONS, SIMULTANEOUSLY BETWEEN TWO STATIONS.

(TELEPHONE)

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14
Q

FDMA

A

FREQUENCY DIVISION MULTIPLE ACCESS

SOME OF THE BANDWIDTH, ALL OF THE TIME.

FREQUENCY SPECTRUM DIVIDED INTO SLOTS SIGNALS OF DIFFERENT USERS PLACED INTO DIVIDED SLOTS

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15
Q

TDMA

A

TIME DIVISION MULTIPLE ACCESS

ALL OF THE BANDWIDTH, SOME OF THE TIME

DIVIDE TIME INTO SLOTS AND SEPARATE THE SIGNALS OF DIFFERENT USERS BY PLACING THE SIGNALS IN SEPARATE TIME SLOTS

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16
Q

CDMA/SSMA

A

CODE DIVIDED / SPREAD SPECTRUM MULTIPLE ACCESS

ALL OF THE BANDWIDTH, ALL OF THE TIME

FREQUENCY HOPPING

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17
Q

HUF

A

HIGHEST USABLE FREQUENCY

THE HIGHEST FREQUENCY THAT CAN BE USED VIA REFLECTION FROM THE IONOSPHERE.

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18
Q

MODULATION

A

ALTERING A CARRIER WAVE

the encoding of information in a carrier wave

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19
Q

SURFACE / GROUND WAVE

A

MF, HF, VHF, UHF

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20
Q

SKY WAVE

A

HF

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21
Q

SPACE WAVE

A

UHF, EHF, SHF

22
Q

LUF

A

LOWEST USABLE FREQUENCY

no comms with decrease in frequency

23
Q

VLF

A

3KHZ - 30KHZ

WAVELENGTH = 10KM

NEAR SURFACE COMMUNICATION WITH SUBMARINES

VERDIN (VLF Digitial Information Network)

EAM SYSTEM

E-6B

TACAMO (Take Charge and Move Out)

24
Q

LF

A

30KHZ - 300KHZ

WAVELENGTH = 1KM

SIMILAR TO VLF. USED FOR RADIO NAVIGATION TRANSMISSIONS.

25
Q

MF

A

300KHZ - 3MHZ

WAVELENGTH = 100M

PRIMARILY USED FOR COMMERCIAL AM BROADCASTING. ALSO USED FOR AIRCRAFT AND MARITIME COMMUNICATIONS. PROVIDES MEDIUM RANGE COMMUNICATIONS.

26
Q

HF

A

3MHZ - 30MHZ

WAVELENGTH = 10M

MEDIUM AND LONG RANGE RADIO COMMUNICATIONS. HF CAN TRAVEL THOUSANDS OF MILES DUE TO RF SIGNAL REFLECTING OFF THE IONOSPHERE.

HFRG (URC-131), R-2368 RCVR, URT-23 XMTR

FAN WIRE AND WHIP ANTENNAS

27
Q

VHF

A

30MHZ - 300MHZ

WAVELENGTH = 1M

USED FOR COMMERCIAL FM BROADCASTING

USED FOR TACTICAL COMMS AND LOS TRANSMISSIONS

BRIDGE TO BRIDGE, IAD (121.5MHZ), MAD (243MHZ)

SINCGARS (Single Channel Ground and Airborne Radio System) - VEHICLE, BACKPACK, HANDHELD VARIANTS

28
Q

UHF

A

300MHZ - 3GHZ

WAVELENGTH = 10CM

NAVY MANAGED BAND. USED FOR LOS AND SATCOM CIRCUITS; VOICE AND DATA; WORKHOUSE OF NAVAL SATELLITE COMMUNICATIONS

ANTENNAS: AS390 - LOS (GROUND) , OE82 (SKY), SSR-1 FLT BCST

DMR (DIGITAL MODULATION RADIO) - HF, VHF, UHF REPLACES WSC-3, DAMA, MINI DAMA

29
Q

HAVEQUICK

A

HAVEQUICK IS A FREQUENCY HOPPING SYSTEM USED TO AS AN ANTI-JAMMING COMMUNICATION SYSTEM. THE HAVEQUICK SYSTEM USES A SERIES OF 16 UHF RADIO FREQUENCIES.

TIME OF THE DAY (TOD) - SYNCHRONIZATION

WORD OF THE DAY - FREQUENCY HOP RATE / PATTERN

NET # - ALLOWS MULTIPLE NETS TO USE SAME WOD

COMMS CHECK - “CONDUCTING MICKIES”

30
Q

CUDIXS

A

COMMON USER DIGITAL INFORMATION EXCHANGE SYSTEM

CUDIXS IS A HIGH SPEED, DIGITAL DATA EXCHANGE SYSTEM USING NAVY SATELLITE SYSTEMS TO PROVIDE SHIP TO SHORE COMMS

TERTIARY MESSAGE TRAFFIC

USES NAVMACS TERMINAL

31
Q

UHF CIRCUITS

A

HAVEQUICK

CUDIXS

FLEET BROADCAST

TSN

LINK 16 (TADIL J)

STJ

32
Q

SHF

A

3GHZ - 30 GHZ

WAVELENGTH = 1CM

ARMY MANAGED BAND

POINT TO POINT SATELLITE COMMUNICATIONS. SOURCE OF IP SERVICES

33
Q

SATELLITES

(3 SEGMENTS)

A

SPACE SEGMENT - PHYSICAL EQUIPMENT

GROUND SEGMENT - FIXED, TRANSPORTABLE, AND MOBILE USER TERMINALS

CONTROL SEGMENT - RESPONSIBLE FOR THE DAY-TO-DAY MANAGEMENT, CONTROL, OPERATION, AND MONITORING OF A SATELLITE CONSTELLATION AND SYSTEM

34
Q

DSCS

A

DEFENSE SATELLITE COMMUNICATIONS SYSTEM

5 IN USE

3 SLEP (SERVICE LIFE ENHANCEMENT PROGRAM)

X BAND

35
Q

WGS

A

WIDEBAND GLOBAL SYSTEM

3 SATELLITES

WSC-6 OR NMT

X, KA BAND, AND GBS

36
Q

CBSP

A

Commercial Broadband Satellite Program

COMMERCIAL

USC-69 OR NMT

C, KU, X BAND

37
Q

NMT

A

NAVY MULTIBAND TERMINAL

CONSOLIDATES SATELLITE COMMS EQUIPMENT (WSC-6, WSC-8, USC-69, USR 10)

INTEGRATED WITH ADNS INC III, THE EBEM (MD-1366) IS A HIGH BANDWIDTH MODEM THAT WORKS WITH X, C, KU, AND KA BAND FREQS, ALLOWS 100MB/S DATA RATES FOR XDR

38
Q

GBS

A

GLOBAL BROADCAST SYSTEM

30 Mb/s

AUGMENTS MILSATCOM BY PROVIDING A HIGH SPEED DOWNLOAD RATE TO CUSTOMERS

USR-10 AND NMT

USES WGS 1-3, UFO 8,10,11, AND COMMERCIAL SATS

SPLIT IP, TV, IMAGERY, IA PATCHES

39
Q

EHF

A

30 GHz - 300 GHz

WAVELENGTH = 1mm

AIR FORCE MANAGED BAND

very short wavelength; severely affected by rain; Anti-Jam, Low Probability of Detection, and Low Probability of Interception

USC-38 OR NMT

SATELLITES - AEHF (LDR, MDR, XDR); MILSTAR 4-6; UFO 7,8,10,11; 3 POLAR (SUBS)

40
Q

LDR

A

LOW DATA RATE (EHF)

2400 BITS/SECOND

SUPPORTS: MISSION DATA UPDATES (MDU), AIR TASKING ORDER (ATO), CUDIXS, FLTBCST

41
Q

MDR

A

MEDIUM DATA RATE (MDR)

1.544 Mb/s

SUPPORTS: MISSION DATA UPDATES (MDU), AIR TASKING ORDER (ATO), MTJ, SIPR IP, STJ, PTP

42
Q

XDR

A

EXTENDED DATA RATE

8+ Mb/s

43
Q

EHF POINT TO POINT (PTP)

A

HALF DUPLEX - Either Tx or Rx, cannot do both simultaneously

FULL DUPLEX - Tx/Rx at the same time

SIMPLEX TRANSIT - Caller can Tx

SIMPLEX RECEIVE - Caller can Rx

44
Q

COMMON FREQUENCIES

A
  • Fleet Tactical - 277.8
  • Navy Red - 332.8
  • MAD - 243
  • IAD - 121.5
45
Q

AM

A
  • Amplitude modulation. Information is put into a radio wave by varying the amplitude. For example, if all we wanted to do was send 1’s and 0’s, we could have just two different levels of amplitude that correspond to these numbers–1 being high, 0 being low.
46
Q

FM

A

Frequency modulation. This time the amplitude is kept constant, it is the frequency that is varied..

47
Q

SINCGARS

A

Single Channel Ground and Airborne Radio System (SINCGARS)

It has single-frequency and frequency hopping modes.

The frequency-hopping mode hops 111 times a second.

48
Q

LINK 11

A
49
Q

LINK 11

A

Link 11 requires a Net Control Station (NCS) and Participating Units (PUs) to operate.

M series message

TADIL A

.2S FOR POLLING RESPONSE

50
Q

WSC-8

A

Commercial Wideband C-band SATCOM

51
Q

WSC-6

A

SHF: X, KA, C (Commercial) Bands

IP Basic Qualification Board (5 decks)

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