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RF > Mod 9 > Flashcards

Mod 9 Flashcards

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

A

Enhanced Tactical Satellite Signal Processor

24
Q

Define NSM

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
Q

Max data rate for NSM

A

52 Megabits per second

26
Q

NSM number of ports

A

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
Q

Port router

A

Movement of data from ports to the multiplexer channels and from demultiplexer channels to ports

Electronic patch panel, provides interconnectivity of data flow

28
Q

Monitor and control of the NSM is accomplished through what type of connection

A

RS232

29
Q

Establishing a communications channel with another user is to ensure..

A

you are transmitting a signal through all phases, from modem, to block up converter, to amplifier

30
Q

during transmission:
Once data from the DTE is received by modem..

A

Modem modulates the information into an IF

31
Q

During transmission, From the modem the IF is

A

Passed to the block up converter where it is translated into a usable RF

32
Q

During transmission, the final stage is

A

amplification at the high power amplifier (HPA)

33
Q

Primary responsibility of block up converter

A

Translate the IF into RF

Provides a veriable amount of attenuation to the transmission frequency in order to control power output

34
Q

A high power amplifier is used to

A

amplify the RF to a level suitable to reach the satellite, provide adequate signal strength for the receiving terminal

35
Q

Most common Amplifier

A

Traveling Wave Tube Amplifier (TWTA)

36
Q

First step of receiving

A

Receive a downlink RF from the assigned satellite

37
Q

Ground terminals often receive a weak downlink signal from satellite due to

A

Distance

ranging from -140dbm and -70 dbm

38
Q

LNA

A

Where it is amplified without degrading the signal to noise ratio

39
Q

Block down converter is used for

A

Frequency Translation

40
Q

Block down converts ______ into _______

A

RF into IF

If will then be sent to modem for data extraction

41
Q

What case is the timing replaceable unit (TRAK9000) contained in

A

Electronics case B/E

42
Q

What allows the antenna to contiously peak on the satellites beacon with minimal drifting

A

Tracking

43
Q

SAA
Small Aperture Antenna

A

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
Q

QLAA
Quad Band Large Aperture Antenna

A

Operates on C, X, KU, KA bands

3.9 meter (13ft)

45
Q

LAMDA
Large Aperture Multi Band Deployable Antenna

A

Operates in C, X and KU

4.9 meters (16ft)

Requires 3-4 personnel and 45 min to 1 hour

46
Q

Lightweight High Gain Xband Antenna (LHGXA)

A

Trailer Mounted

4.9 meter (16ft)

3-4 personnel to set up 45 min - 1 hour

47
Q

Quick Reaction Satellite Antenna (QRSA)

A

Trailer mounted

6.1 meter (20ft)

x band

6-8 personnel for setup, 1-2 hours

48
Q

Primary tracking mode in ACU

A

Optrack

49
Q

STORES azimuth, elevation and polarization

A

Optrack

50
Q

Forms an Ephermeris model

A

Optrack

51
Q

Can predict where the satellite is in the event of signal loss

A

Optrack

52
Q

Enhanced version of Optrack, but USER ENTERS intial azmiuth, elevation, and polarization

A

Position track

53
Q

Enchanced Optrack, but user enters latitude and longitude

A

Geotrack

54
Q

Once it reaches set postion, it wil begin optrack or step track

A

Geo track

55
Q

Memory track

A

After enough stored memory is aquired, the antenna will repeat its track principles day by day

RF (5 decks)

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