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ACOM/IFT CAT 1 > VLF Receive > Flashcards

Flashcards in VLF Receive Deck (31):
1

What is the function of the VLF Receive susbystem?

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

2

Where is the VLF Receive Antenna located?

top of the aircraft, forward of the vertical stabilizer
station 1240

3

What are the power requirements for the VLF Receive Antenna?

Passive

4

What is the function of the VLF Receive Antenna?

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

5

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

E43 Bay 2

6

What are the power requirements for the MMRTs?

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

7

What is the function of the MMRTs?

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

8

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

P30 Bay 4

9

What are the power requirements for the ECU Remote Control?

+7 VDC from Transfer Module (TM)

10

What is the function of the ECU Remote Control?

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

11

Where are the KGV-361/TSEC ECs located?

E43 Bay 2

12

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

receives operating voltages from its respective MMRT

13

What is the function of the KGV-361s?

-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

14

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

P30 Bay 4

15

What are the power requirements for the VLF RCP?

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

16

What is the function of the VLF RCP?

to apply power to and remove power from the VLF Receivers

17

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

E48 VLF receive overhead platform
6

18

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

28 VDC from VLF Preamp/Filter Control Panel

19

What is the function of the VLF Preamplifier/Filters?

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

20

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

2 incoming VLF signals from the VLF Receive Antenna

21

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

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

22

What is used to reject the onboard VLF transmitted signal?

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

23

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

at least 57 dB

24

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

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

25

Where is the VLF Preamplifier/Filter Control Panel located?

P30 Bay 4

26

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

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

27

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

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

28

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

AUTO, MANUAL, BYPASS

29

In AUTO, frequencies are attenuated between...

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

30

In MANUAL...

operator manually selects one of the six notch filters

31

In BYPASS...

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)