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ACOM/IFT CAT 1 > VLF Receive > Flashcards

VLF Receive Flashcards

1
Q

What is the function of the VLF Receive susbystem?

A

automatically receive, amplify, demodulate, decrypt, and process secure and nonsecure messages at extended ranges in nuclear and jammed environments

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2
Q

Where is the VLF Receive Antenna located?

A

top of the aircraft, forward of the vertical stabilizer

station 1240

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3
Q

What are the power requirements for the VLF Receive Antenna?

A

Passive

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4
Q

What is the function of the VLF Receive Antenna?

A

to receive incoming VLF signals and route them to the VLF Pramplifier/Filter on two separate conductors (one for each orthogonal loop)

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5
Q

Where are the 3 Modified Miniature Receive Terminals (MMRT) located?

A

E43 Bay 2

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6
Q

What are the power requirements for the MMRTs?

A

115 VAC 400 Hz 3 phase from MMRT RCVR AC c/b on MDF 2

28 VDC from MMRT RCVR DC c/b on MDF 2

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7
Q

What is the function of the MMRTs?

A

receives, amplifies, demodulates, decrypts, and processes secure and nonsecure messages (receive-only)

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8
Q

Where is the End Cryptographic Unit (ECU) Remote Control located?

A

P30 Bay 4

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9
Q

What are the power requirements for the ECU Remote Control?

A

+7 VDC from Transfer Module (TM)

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10
Q

What is the function of the ECU Remote Control?

A

to provide Transfer Module (TM) control selection via the ECU SELECT switch

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11
Q

Where are the KGV-361/TSEC ECs located?

A

E43 Bay 2

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12
Q

What are the power requirements for the KGV-361s?

A

receives operating voltages from its respective MMRT

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13
Q

What is the function of the KGV-361s?

A
  • provide the capability for operator loading and selection of cryptographic algorithms
  • store 20 algorithms
  • run 10 algorithms
  • provide Traffic Encryption Key (TEK) Key Bank storage
  • store up to 10 Algorithm Encryption Keys (AEK)
  • store up to 13 Key Encryption Keys (KEK)
  • perform a BIT
  • allow the operator to update software
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14
Q

Where is the VLF Receiver Control Panel (RCP) located?

A

P30 Bay 4

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15
Q

What are the power requirements for the VLF RCP?

A

28 VDC from MMRT RCP 1, 2, & 3 on P30-3

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16
Q

What is the function of the VLF RCP?

A

to apply power to and remove power from the VLF Receivers

17
Q

Where are the VLF Preamplifier/Filters located and how many are there?

A

E48 VLF receive overhead platform

6

18
Q

What are the power requirements for the VLF Preamplifier/Filters?

A

28 VDC from VLF Preamp/Filter Control Panel

19
Q

What is the function of the VLF Preamplifier/Filters?

A

to receive incoming VLF signals from the VLF Receive Antenna and to amplify, combine, and distribute the signals to the MMRTSs

20
Q

From where do the VLF Preamplifier/Filters receive the signal?

A

2 incoming VLF signals from the VLF Receive Antenna

21
Q

By how much do the VLF Preamplifier/Filters amplify RF signals?

A

approximately -23 dB (14 KHz) to 11 dB (60 KHz)

22
Q

What is used to reject the onboard VLF transmitted signal?

A

a bank of 6 Notch Filters (band reject filters) covering the 17- to 30-KHz frequency band

23
Q

In AUTO mode, the transmitted frequency will be attenuated by…

A

at least 57 dB

24
Q

How do the VLF Preamplifier/Filters provide in-house loopback capability?

A

by injecting a signal from the SSPA/C Input Module directly into the MMRT Receive System

25
Q

Where is the VLF Preamplifier/Filter Control Panel located?

A

P30 Bay 4

26
Q

What are the power requirements for the VLF Preamplifier/Filter Control Panel?

A

28 VDC from VLF NOTCH FILTER c/b on MDF 2

27
Q

What is the function of the VLF Preamplifier/Filter Control Panel?

A

provide power to the Preamplifier and control of the Notch Filter
provide the routing of the transmit monitor signal to the VLF receivers

28
Q

What are the 3 positions of the Notch Filter Freq Select-KHz switch?

A

AUTO, MANUAL, BYPASS

29
Q

In AUTO, frequencies are attenuated between…

A

17 and 30 KHz by at least 57 dB at the front end of the VLF Preamplifier/Filter

30
Q

In MANUAL…

A

operator manually selects one of the six notch filters

31
Q

In BYPASS…

A

no notch filtering is used

RF signals are amplified in the 14- to 60-KHz range by approximately -23 dB (14 KHz) to 11 dB (60 KHz)

ACOM/IFT CAT 1 (27 decks)

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