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RF > Mod 9 > Flashcards

Mod 9 Flashcards

(55 cards)

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1
Q

Reflector

A

Used for transmitting and receiving microwave frequencies to and from space

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2
Q

Using a parabolic shape results in

A

Higher Gain

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3
Q

This size of the parabolic reflector is ________ proportionate to the frequency

A

Inversely

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4
Q

Feed horn

A

Horn antenna that offers conveying of signals to and from the dish, attached to waveguides

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5
Q

Feed horn linear polarization

A

Horizontal or vertical polarization adjustments

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6
Q

Feed horn circular polarization

A

Adjusted right hand or left hand polarization

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7
Q

Feed horns are specific to their

A

Frequency Band

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8
Q

Job of a modem

A

Convert the digital data to useable electromagnetic waves during transmit

Opposite during receive

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9
Q

Transmit signal flow

A

DTE sends digital (baseband)
info to modem > modem turns digital to analog IF > IF sent to up converter for final translation to RF (transmit frequency )

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10
Q

FEC (Forward Error Correction)

A

Adds artificial redundancy to a data stream and uses this redundancy to fix errors caused by noise and interference

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11
Q

Scrambling

A

Modems can obfuscate analog data, makes it difficult to read without proper key

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12
Q

Scrambling should not be confused with

A

Encryption

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13
Q

Coaxial cable

A

Due to its grounded outer conducting shield, less vulnerable to EMI

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14
Q

GMT is capable of how many uplinks and how many downlinks per hub

A

1 uplink and 6 downlinks per hub

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15
Q

The GMT has how many transit cases total?

A

29: 19 antenna cases, 6 electronics cases, 2 PDP cases, 2 spare equipment cases

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16
Q

What cases go on the second pallet

A

2 Spare equipment and 2 PDP cases

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17
Q

GMT requires how many personnel for setup

A

2 personel

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18
Q

List all 5 antennas

A

Small aperture antenna (SAA)

Quick Reaction Satellite antenna (QRSA)

Lightweight High Gain Xband Antenna (LHGXA)

Large Aperture Multiband Deployable Antenna (LAMDA)

Quad band Large Aperture Antenna (QLAA)

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19
Q

PDPs are designed for use with how many amps

A

60

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20
Q

Local PDP has to be within how many feet of local power source

A

50 feet

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21
Q

Remote PDPs can be separated from the local PDP up to how many feet

A

250 feet

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22
Q

Which cases is the NSM in

A

A and D

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23
Q

ETSSP stands for

Study These Flashcards
A

Enhanced Tactical Satellite Signal Processor

24
Q

Define NSM

Study These Flashcards
A

Synchronous time division multiplexer used in satellite earth terminal

Full duplex

inputs from synchronus data users and digital non secure/secure voice orderwire are multiplexed into a single output aggregate and supplied to modem

25
Max data rate for NSM
52 Megabits per second
26
NSM number of ports
26 total: 12 NRZ, 6 TI/E1, 2 HSSI, 6 conditioned di phase ports only 12 ports can be configured in a single configuration
27
Port router
Movement of data from ports to the multiplexer channels and from demultiplexer channels to ports Electronic patch panel, provides interconnectivity of data flow
28
Monitor and control of the NSM is accomplished through what type of connection
RS232
29
Establishing a communications channel with another user is to ensure..
you are transmitting a signal through all phases, from modem, to block up converter, to amplifier
30
during transmission: Once data from the DTE is received by modem..
Modem modulates the information into an IF
31
During transmission, From the modem the IF is
Passed to the block up converter where it is translated into a usable RF
32
During transmission, the final stage is
amplification at the high power amplifier (HPA)
33
Primary responsibility of block up converter
Translate the IF into RF Provides a veriable amount of attenuation to the transmission frequency in order to control power output
34
A high power amplifier is used to
amplify the RF to a level suitable to reach the satellite, provide adequate signal strength for the receiving terminal
35
Most common Amplifier
Traveling Wave Tube Amplifier (TWTA)
36
First step of receiving
Receive a downlink RF from the assigned satellite
37
Ground terminals often receive a weak downlink signal from satellite due to
Distance ranging from -140dbm and -70 dbm
38
LNA
Where it is amplified without degrading the signal to noise ratio
39
Block down converter is used for
Frequency Translation
40
Block down converts ______ into _______
RF into IF If will then be sent to modem for data extraction
41
What case is the timing replaceable unit (TRAK9000) contained in
Electronics case B/E
42
What allows the antenna to contiously peak on the satellites beacon with minimal drifting
Tracking
43
SAA Small Aperture Antenna
Operates on C, X, KU, KA bands 8 reflector panels tri band HPA must be mounted to the feed boom 2.4 meter (8ft)
44
QLAA Quad Band Large Aperture Antenna
Operates on C, X, KU, KA bands 3.9 meter (13ft)
45
LAMDA Large Aperture Multi Band Deployable Antenna
Operates in C, X and KU 4.9 meters (16ft) Requires 3-4 personnel and 45 min to 1 hour
46
Lightweight High Gain Xband Antenna (LHGXA)
Trailer Mounted 4.9 meter (16ft) 3-4 personnel to set up 45 min - 1 hour
47
Quick Reaction Satellite Antenna (QRSA)
Trailer mounted 6.1 meter (20ft) x band 6-8 personnel for setup, 1-2 hours
48
Primary tracking mode in ACU
Optrack
49
STORES azimuth, elevation and polarization
Optrack
50
Forms an Ephermeris model
Optrack
51
Can predict where the satellite is in the event of signal loss
Optrack
52
Enhanced version of Optrack, but USER ENTERS intial azmiuth, elevation, and polarization
Position track
53
Enchanced Optrack, but user enters latitude and longitude
Geotrack
54
Once it reaches set postion, it wil begin optrack or step track
Geo track
55
Memory track
After enough stored memory is aquired, the antenna will repeat its track principles day by day

RF (5 decks)

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