VLF Transmit Flashcards
What is the function of the VLF Transmit?
to process message data into a suitable format for VLF transmission
What does the Dual Trailing Wire Antenna (DTWA) consist of?
Short Trailing Wire Antenna (STWA)
Long Trailing Wire Antenna (LTWA)
Utility Trailing Wire Antenna (UTWA)
Where are the DTWA components located?
STWA - mounted on top of the UTWA enclosure
LTWA - aft mission equipment area
UTWA - supports the STWA enclosure
What are the power requirements for the DTWA?
passive
What is the function of the LTWA?
serves as a couterpoise antenna (ground plane) for the RF-fed antenna
What is the function of the STWA?
serves as an RF-fed antenna (transmitting plane) for the counterpoise antenna
What is the function of the UTWA?
included for redundancy but functions only as a ground plane antenna
Where is the VLF Transmit Terminal (aka VERDIN Transmit Terminal) located?
middle shelf of P30 Bay 5
What are the power requirements of the VLF Transmit Terminal?
115 VAC 400 Hz from VLF XMT TERM on P30
28 VDC from VLF XMT TERM on P30
What is the function of the VLF Transmit Terminal?
accept teletypewriter data from MCS and convert it to MSK or FSK data
What frequency range is the carrier signal that the VLF Transmit Terminal sends to the SSPA/C?
10- to 59.99-KHz
What frequency range is the Stable Master Oscillator (SMO) reference signal that is applied to the SSPA/C and the VLF Preamplifier/Filter Control?
715 to 741 KHz
What is TX mode 1530
MM15
FSK 50
unsecure
What is TX mode 3933
HIDAR
MSK 1600
secure
What is TX mode 0933
MMPM
MSK 800
secure
Where is the VLF Transmit Terminal Processor located?
middle shelf of P30 Bay 5
What are the power requirements for the VLF Transmit Terminal Processor?
115 VAC 400 Hz from VLF XMT TERM on P30
28 VDC from VLF XMT TERM on P30
What is the function of the VLF Transmit Terminal Processor?
process and route message data from MCS to VERDIN Control Unit, process the data and control the I/O devices, perform error detection
Where is the VERDIN Control Unit located?
middle shelf of P30 Bay 5
What are the power requirements of the VERDIN Control Unit?
115 VAC 400 Hz from VLF XMT TERM on P30
28 VDC from VLF XMT TERM on P30
What is the function of the VERDIN Control Unit?
maintains and detects faults in timing, interfaces processor I/O data and applies data to SSPA/C input modules
Where are TSEC 5 & 6 located?
P30 Bay 5
What are the power requirements for TSEC 5 & 6?
28 VDC from TSEC 5 & TSEC 6 on P30
What is the function of TSEC 5 & 6?
encryp data
