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96 Cards in this Set

  • Front
  • Back
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
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?
804.2 For how many receivers can each OCU select the RF beam?
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?
808.2 How is position to frequency programming accomplished?
Via the SCT
808.3 Is system fault location desplayed on the SCT's display?
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?
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.
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?
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?
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?
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?
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.