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