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ACOM/IFT CAT 1 > VLF Transmit > Flashcards

VLF Transmit Flashcards

1
Q

What is the function of the VLF Transmit?

A

to process message data into a suitable format for VLF transmission

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2
Q

What does the Dual Trailing Wire Antenna (DTWA) consist of?

A

Short Trailing Wire Antenna (STWA)
Long Trailing Wire Antenna (LTWA)
Utility Trailing Wire Antenna (UTWA)

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3
Q

Where are the DTWA components located?

A

STWA - mounted on top of the UTWA enclosure
LTWA - aft mission equipment area
UTWA - supports the STWA enclosure

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4
Q

What are the power requirements for the DTWA?

A

passive

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5
Q

What is the function of the LTWA?

A

serves as a couterpoise antenna (ground plane) for the RF-fed antenna

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6
Q

What is the function of the STWA?

A

serves as an RF-fed antenna (transmitting plane) for the counterpoise antenna

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7
Q

What is the function of the UTWA?

A

included for redundancy but functions only as a ground plane antenna

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8
Q

Where is the VLF Transmit Terminal (aka VERDIN Transmit Terminal) located?

A

middle shelf of P30 Bay 5

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9
Q

What are the power requirements of the VLF Transmit Terminal?

A

115 VAC 400 Hz from VLF XMT TERM on P30

28 VDC from VLF XMT TERM on P30

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10
Q

What is the function of the VLF Transmit Terminal?

A

accept teletypewriter data from MCS and convert it to MSK or FSK data

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11
Q

What frequency range is the carrier signal that the VLF Transmit Terminal sends to the SSPA/C?

A

10- to 59.99-KHz

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12
Q

What frequency range is the Stable Master Oscillator (SMO) reference signal that is applied to the SSPA/C and the VLF Preamplifier/Filter Control?

A

715 to 741 KHz

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13
Q

What is TX mode 1530

A

MM15
FSK 50
unsecure

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14
Q

What is TX mode 3933

A

HIDAR
MSK 1600
secure

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15
Q

What is TX mode 0933

A

MMPM
MSK 800
secure

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16
Q

Where is the VLF Transmit Terminal Processor located?

A

middle shelf of P30 Bay 5

17
Q

What are the power requirements for the VLF Transmit Terminal Processor?

A

115 VAC 400 Hz from VLF XMT TERM on P30

28 VDC from VLF XMT TERM on P30

18
Q

What is the function of the VLF Transmit Terminal Processor?

A

process and route message data from MCS to VERDIN Control Unit, process the data and control the I/O devices, perform error detection

19
Q

Where is the VERDIN Control Unit located?

A

middle shelf of P30 Bay 5

20
Q

What are the power requirements of the VERDIN Control Unit?

A

115 VAC 400 Hz from VLF XMT TERM on P30

28 VDC from VLF XMT TERM on P30

21
Q

What is the function of the VERDIN Control Unit?

A

maintains and detects faults in timing, interfaces processor I/O data and applies data to SSPA/C input modules

22
Q

Where are TSEC 5 & 6 located?

A

P30 Bay 5

23
Q

What are the power requirements for TSEC 5 & 6?

A

28 VDC from TSEC 5 & TSEC 6 on P30

24
Q

What is the function of TSEC 5 & 6?

A

encryp data

25
Q

KG 1 is TSEC __

KG 2 is TSEC __

A

6

5

26
Q

Where is the VLF Air Interlock Panel located?

A

below the T/FSDS in P30 Bay 6

27
Q

What are the power requirements for the VLF Air Interlock Panel?

A

28 VDC from VLF AIR INTLK on P30

28
Q

What is the function of the VLF Air Interlock Panel?

A

remove primary power from VLF TX Terminal during overheat; BATTLE SHORT for emergency loss of cooling air

29
Q

What does VDT stand for?

A

Verify DePLSO Text

ACOM/IFT CAT 1 (27 decks)

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