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96 Cards in this Set
- Front
- Back
801.1 State the purpose of the reference frequency oscillator.
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To generate a frequency used to control timekeeping of the internal clocks in ECCM components, which in turn enables frequency hopping.
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801.2 Match the mode of operation.
1.hf-ssb a an/vrc-92 2.vhf-fm b. an/vrc-83 3.vhf-am c. an/urc-113 4.uhf-am |
1.C
2.A 3.B 4.B |
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802.1 What part of the RT-1319/URC accomplishes tuning of the main receiver?
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The data converter
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802.3 What happens in the event of overheating in the RT-1319/URC during high power operation?
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Output power is reduced to 2 watts.
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802.3 What is the purpose of the reflectometer?
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It develops forward and reflected power samples that are returned to modulator circuits to maintain a constan carrier output level and percentage of modulation.
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802.4 In the display and control circuitry, what happens if the source voltage drops below +20 Vdc.
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A lo-battery signal from the power supply is sent to the microprocessor in the data converter.
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803.1 List the five functional modules contained within the AN/URC-113 RT unit.
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Control panel, synthesizer, modulator/dimodulator, harmonic filter and power supply.
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803.2 State the functions of the AM-7148.
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Impedance matching, amplification, fault sensing, and faulty assembly identification.
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803.3 What determines synthesizer frequency output?
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Mode of operation
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804.1 What equipment is considered the heart of the entire antenna system?
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The RFSM
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804.2 For how many receivers can each OCU select the RF beam?
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16
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804.3 What is the purpose of the goniometer?
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To simulate antenna rotation.
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805.1 What is the purpose of the antenna array's two reflecting screens?
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The screens funtion as reflectors to increase the power gain of individual antenna elements and to aid in the formation of specific beam patterns.
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805.2 Describe the purpose of the ground screens.
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The ground screens help to stabilize antenna element impedance characteristics and provide uniform impedance from element to element, regardless of the variation in the electrical properties in the soil.
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805.3 By what method do signals travel from the central building to the operations building?
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Via a cable tunnel.
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806.1 Describe the dual processor cancept utilized in the RFSM.
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The second processor unit continually monitors the first processor unit for malfunctions. In the event of a failure in the first processor unit, the second processor unit assumes system control.
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806.2 What is the purpose of the RFSM control subsystem?
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To provide the necessary computer-assisted functions for the RFSM system.
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806.3 List the subsystems tested during BITE operation.
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Multicoupler subsystem, matrix subsystem, and DF subsystem
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806.4 What is the purpose of the ID MUX?
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To provide an interface between the RFSM control subsytem and the OCU's.
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806.5 What item does the operator use to select the azimuth of an RF signal to be sent to a particular receiver?
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The operator control unit (OCU).
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807.1 Identify the two major assemblies of the ETVS.
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Communications console and central equipment
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807.2 Where are the maintenance position located?
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At the central equipment racks
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807.3 What capabilities can be provided at the maintenance position?
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The same as any operator position
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808.1 What is the primary operator-control mechanism?
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The TED
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808.2 How is position to frequency programming accomplished?
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Via the SCT
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808.3 Is system fault location desplayed on the SCT's display?
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True
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808.4 What type of link does the system use to pass card status and switchover control between reduntant radio processor cards?
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RS-232 link
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809.1 What is the purpose of the central equipment processor cards?
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To provide central equipment interface
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809.2 What is the purpose of the DA and IA controls?
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To establish telephone communications.
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809.3 How does an operator initiate communications for a radio channel?
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Via a key-press on the TED
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809.4 In what form does microphone audio travel to the equipment rack during transmit?
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In digital form
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809.5 State the functions of the CCS
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To disignate operator position functions and system configuration.
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810.1 How is DRU record and playback controlled?
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With the computer workstation
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810.2 State the purpose of the NiceLog Software Suite?
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To manipulate various features within the system.
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810.3 In the event of a power failure, how long will the UPS power the system?
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Five minutes
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811.1 What is the recording capacity of each DAT in the DVRS?
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500 linear hours
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811.2 What is the source of time of day for recording time stamp purposes?
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A GPS receiver
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811.3 Which CCA in the DRU digitizes the audio?
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The audio interface (ADIF)
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811.4 When is information on the hard disk deleted?
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When the software determines that particular audio is the oldest audio on the hard disk and the hard disk is full.
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812.1 Define the term Sounding?
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The process of transmitting a signal on a frequency used by other stations to determine that channel's usability.
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812.2 State the purpose of Link Quality Analysis?
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To determine a particular frequency's signal quality.
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812.3 What designation is given a station that has an address that is not programmed into your station's other address table?
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Floating address.
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813.1 Name the three sites that comprise a SCOPE Command remote station?
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control site, receive site, transmit site.
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813.2 What is the output power at the transmit site?
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4000 watts
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813.3 How many stations exist in the SCOPE Command HFGCS?
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14
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813.4 Give an advantage of using HF communications for E-mail
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The spectrum is always available wheras satellites tend to be busy during a crisis.
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814.1 State the three steps of ALE linking?
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Call, response, acknowledge
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814.2 Name the protocal used for all communications between SCOPE Command software processors.
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TCP/IP.
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814.3 What are the only audio-related circuits that do not terminate in the digital electronic switch?
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Key-line and inter-site modems.
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815.1 What RT-2200 subassembly performs all HF mode modulation, demodulation, and ALE modem processing?
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Digital signal processor
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815.2 What controls scanning receiver operation?
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RS-422 interface data from the SCOPE command software server.
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815.3 What is the channel-hour capacity of the removable disks in the digital recorders?
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650 channel-hours
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816.1 What do we use the initial RF loop-back test to establish?
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To establish baseline values
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816.2 Does the RF loop-back test determine the system's performance while communicating with a distant station?
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No
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816.3 When initiated, how many times is an RF loop-back test actrually ran?
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Three times
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817.1 State the purpose of DAMA.
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to allocate and share satellite bandwidth on a demand assigned basis
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817.2 Who may function as a network control station?
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Any unit with the required hardware and software.
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817.3 State the frequency range in which the PSC-5 can operate in DAMA mode.
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225-400 MHz
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818.1 What is the reference frequency for the 1st synthesizer loop?
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200 kHz
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818.2 Which AN/PSC-5 module performs BIT functions?
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The controller module
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818.3 State the purpose of the COMSEC module's INDICTOR chip.
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It performs voice and data encryption
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819.1 During preselection/amplification, what is the purpose of the digitally controlled potentiometers?
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Developing the tuning voltage and squelch level
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819.2 In AM receive mode, what generates the AGC voltage?
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The AM detector
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819.3 What provides RF selectivity for receive operations?
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A varactor tuned front end.
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820.1 How is information that is received on the SLFCS displayed?
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On the HA VDU
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820.2 Name the two systems that utilize the hard UHF transmit and receive antenna
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UHF voice and AFSATCOM
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820.3 Which of the missile communications system antennas is buried?
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The SLFCS antenna.
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821.1 The RMPS enables monitor and control of what three systems?
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SLFCS, AFSATCOM, and SACDIN
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821.2 State the purpose of the AFSATCOM control indicator.
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Operator interface
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821.3 What is used as the transceiver unit in the UHF communications system?
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The RT-980/GRC-171.
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821.4 What is the Minimum output power of the UHF system?
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100 watts
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822.1 What produces EMP?
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Nuclear explosions
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822.2 What is the relationship between EMP damage susceptibility and circuit complexity?
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Vulnerablility to EMP increases with electronic complexity
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822.3 What requirements must be met for the demodulator to provide data deciphering of encrypted signals?
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wrong
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823.1 What are the two basic units of the AN/FRR-97
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The antenna assembly and the recfeiver group.
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823.2 What is the operating frequency range of the SLFCS?
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VLF/LF, 14-60 kHz
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823.3 What requirements must be met for the demodulator to provide data deciphering of encrpyted signals?
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The receiver site must be time-synchronized with and use the identical key as the distant transmitter.
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823.4 What two components make up the REACT console?
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The RMPS and the HA VDU.
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824.1 What does the term ICOM indicate?
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The term ICOM indicates integrated COMSEC capability.
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824.2 Which section of the RT-1523 is responsible for modulation and demodulation.
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The RF section
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824.3 State the purpose of the interleaver during receive.
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Removal of synchronization and frequency hopping information that is embedded in the signal.
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825.1 How many different impedance bands are contained in the impedance matching network?
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4
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825.2 Which band of the impedance matching network is used if a BNC-type connector is connected to the RT?
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The 50 ohm band
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825.3 State two conditions which will cause the SIDETONE DISABLE line to be set to logic level 1.
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Temperature exceeding 105C or VSWR exceeding 5:1
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826.1 Name the 3 items used to select frequency from the look-up table during FH mode.
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The TRANSEC variable, FH sync time (TOD), and net ID number.
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826.2 Where does the control module obtain instructions during remote operation?
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The control module executes intructions from the remote I/O module during remote operations.
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826.3 Which RF section module performs modulation of the carrier?
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The exciter/power amplifier.
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827.1 What component controls the level of two or more inputs?
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The mixer
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827.2 What component might be needed if audio were distributed to several amplifiers? What wold this prevent?
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A distribution amplifier might be needed Its use would help to prevent signal loss.
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827.3 State the difference between RMS power and peak power in terms of speaker specification.
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RMS power denotes the wattage the speaker can handle on a continuous basis while peak power denotes the wattage it can handle on an intermittent basis.
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828.1 Name the three configurations we use to connect speakers to an amplifier.
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Series, parallel, and series-parallel.
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828.2 What is the result of an impedance mismatch between an amplifier and speakers?
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An impedance mismatch causes distortion
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828.3 If your amplifier offers 4, 8, and 16-ohm outputs, which one provides an exact impedance match for four 16 ohm speakers connected in parallel?
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The 4 ohm output(4=16/4)
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828.4 What is the result of connection too many speakers in parallel?
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Loss of power capability
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828.5 State teh disadvantage of using a 70 volt, constant voltage speaker connection
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Volume is limited
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828.6 Name the three most common sound system connectors.
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Phone connector, phono connector, and XLR connector.
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