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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
MF
300KHZ - 3MHZ WAVELENGTH = 100M PRIMARILY USED FOR COMMERCIAL AM BROADCASTING. ALSO USED FOR AIRCRAFT AND MARITIME COMMUNICATIONS. PROVIDES MEDIUM RANGE COMMUNICATIONS.
26
HF
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
VHF
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
UHF
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
HAVEQUICK
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
CUDIXS
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
UHF CIRCUITS
HAVEQUICK CUDIXS FLEET BROADCAST TSN LINK 16 (TADIL J) STJ
32
SHF
3GHZ - 30 GHZ WAVELENGTH = 1CM ARMY MANAGED BAND POINT TO POINT SATELLITE COMMUNICATIONS. SOURCE OF IP SERVICES
33
SATELLITES (3 SEGMENTS)
_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
DSCS
DEFENSE SATELLITE COMMUNICATIONS SYSTEM 5 IN USE 3 SLEP (SERVICE LIFE ENHANCEMENT PROGRAM) X BAND
35
WGS
WIDEBAND GLOBAL SYSTEM 3 SATELLITES WSC-6 OR NMT X, KA BAND, AND GBS
36
CBSP
Commercial Broadband Satellite Program COMMERCIAL USC-69 OR NMT C, KU, X BAND
37
NMT
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
GBS
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
EHF
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
LDR
LOW DATA RATE (EHF) 2400 BITS/SECOND SUPPORTS: MISSION DATA UPDATES (MDU), AIR TASKING ORDER (ATO), CUDIXS, FLTBCST
41
MDR
MEDIUM DATA RATE (MDR) 1.544 Mb/s SUPPORTS: MISSION DATA UPDATES (MDU), AIR TASKING ORDER (ATO), MTJ, SIPR IP, STJ, PTP
42
XDR
EXTENDED DATA RATE 8+ Mb/s
43
EHF POINT TO POINT (PTP)
_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
COMMON FREQUENCIES
* Fleet Tactical - 277.8 * Navy Red - 332.8 * MAD - 243 * IAD - 121.5
45
AM
* 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
FM
Frequency modulation. This time the amplitude is kept constant, it is the frequency that is varied..
47
SINCGARS
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
LINK 11
49
LINK 11
Link 11 requires a Net Control Station (NCS) and Participating Units (PUs) to operate. M series message TADIL A .2S FOR POLLING RESPONSE
50
WSC-8
Commercial Wideband C-band SATCOM
51
WSC-6
SHF: X, KA, C (Commercial) Bands

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