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136 Cards in this Set
- Front
- Back
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what is the primary purpose of HF radios |
to provide long range/distance communication |
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name four primary disadvantages associated with HF transceivers |
higher transmitter power narrower bandwidth carrier wave power lower fidelity |
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what's the primary reason for using SSB modulation |
bc of the need for many channels in HF radio |
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How many channels does a typical HF radio have and what's the spacing between each channel |
280,000 channels spaced 100 Hz apart |
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When using the USB mode, what's the transmitted frequency when the HF control box is set to 25.000 MHz and the signal is modulated by a 1000 Hz tone |
the USB is 25.001 MHz |
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What's the difference between normal AM signal and AME signal |
AME consists of the carrier and only one sideband. AM consists of carrier and both sideband |
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Why is an antenna coupler required in an HF system |
to match the impedance of the antenna to the selected frequency |
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What's the frequency range of the ARC-190 system |
2.0000 to 29.9999 MHz |
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Name 6 modes of transmission and reception |
USB voice LSB voice USB data LSB data AME CW |
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What are the major components of the ARC 190 system |
receiver transmitter control box antenna coupler |
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How does the ARC 190 receiver minimize the effects of strong interfering signals |
by using dual conversion and crystal band pass filters |
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what's the ARC 190 tune time when using a learned preset |
less than 35 ms |
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what's the major functional difference between the three versions of the RT 1341 |
the RT 1341 (V) 1 works only with coupler CU 2275 (V) 1. other RTs work with all couplers |
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What form of frequency control data are sent between the RT and the control box |
serial ASCII control words at a rate of 9,600 bauds |
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Why is the tuner section of the antenna coupler pressurized |
to prevent high voltage arcing at high altitudes to allow controlled cooling and to prevent the entry of corosion elements |
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Why does the antenna coupler need to match the impedance of the antenna to the RT unit |
for max power transfer |
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When does the RTs external blower come on |
when the RT is keyed and for about a minute after its unkeyed |
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What indications will you get if the external blower overheats |
it will cause an RT fault and will keep the transmitter from functioning |
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Which comm/nav systems operate in the VHF spectrum |
VHF AM and FM VOR localizer |
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What propagation characteristic do the VHF system share |
operated by LOS |
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What's the main use for military FM radio |
communication with army and other ground units |
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Why do you need a VHF AM radio on an aircraft |
alternate command radio contacting civilian and foreign agencies |
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Which VHF radio communication extends beyond the LOS |
VHF FM at the lower frequencies depending at atmospheric conditions the signal can skip over the horizon |
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Which VHF systems need antenna tuning |
How many
FM |
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How many antennas does a VHF AM/FM radio need for communication and direction finding |
5; one for each AM communication FM communication and AM DF; 2 for FM homing |
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How far apart are the channels of the ARC 186 system |
25 kHz |
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To which frequencies of the VHF spectrum can the ARC 186 tune |
FM 30 to 87.975 MHz AM 108 to 151.975 MHz |
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On which frequencies can the ARC 186 only receive |
108 to 115.975 MHz |
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Why is the C11029 considered a true comm/nav control box |
bc it controls both the ARC 186 and the VOR/ILS receiver |
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Which LRU would only be required in an installation where there was no available source for +28 VDC power |
PP 7541 power supply |
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What type of communication are UHF radios used for |
short range |
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When the ARC 164 was originally introduced, what was its main advantage |
high reliability |
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How many frequencies can the ARC 164 transmitter operate on |
7000 |
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How does the HQ program resist jamming |
by frequency hopping |
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Why is it difficult for enemies to jam HQ transmissions |
bc they never know what frequencies the radio are operating on |
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Why does frequency hopping work with multiple HQ radios |
bc all HQ radio frequencies hop to the same frequency at the same time |
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How could an enemy effectively jam HQ communication |
by jamming the entire UHF band |
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What three entries are required to operate in the AJ mode |
WOD TOD net number |
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What prevents WODs from being lost when power is removed from the radio set |
they're stored in nonvolatile memory in the RT |
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How many WODs can be loaded into memory |
six |
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How does the HQII radio know which WOD to use |
a date code is loaded in memory location 14 for each word |
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What entry ensures HQII radios frequency hop at the same instant in time |
TOD |
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What entry establishes an HQII radios entry point to the frequency hopping pattern |
net number |
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Whats conferencing |
the ability of an HQII radio to receive two signals simultaneously
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What type of bandpass characteristics makes conferencing possible |
wideband |
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In what two configurations is the ARC 164 available |
remote and panel mount |
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What configuration was most often used as a replacement for an older radio |
remote |
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Whats the function of the data converter found on remote RT units |
to interface between control unit and RT |
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What is a ID 1961 |
optional remote frequency channel indicator |
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With the MWOD modification, how many WODs can be loaded |
six WOD for six days |
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Whats the purpose of the modification providing the capability to use ANVIS green panel lighting |
to allow the use of the radio set with night vision goggles |
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What is the primary purpose of the ARC210 radio system |
provides air to air and air to ground two way voice communications in both the VHF and UHF ranges |
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What modules are contained within RT 1794 |
COMSEC control synthesizer receiver/exciter power supply power amp |
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Which LRU is considered the backup method of controlling the ARC 210 radio system |
radio set control |
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Why is the high pass filter used in the ARC210 radio system |
to attenuate high powered commercial FM stations below 108 MHz |
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When will the radio set control be used to operate the ARC210 radio system |
in the event of a dual integrating processing center failure, the RSC will be used to control the radio system |
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How do you swap the active and standby frequencies on the remote tuning panel |
by pressing the swap pushbutton (inner knob) |
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How mnany channels can be selected by the RSC while in preset frequency mode |
25 channels |
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What frequency range must you tune the ARC210 RT if you want to listen to a specific airports air traffic control info |
108 through 117.975 MHz AM receiver only for ATC info |
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On what assumption is the ability to share bandwidth in the Demand Assigned Multiple Access SATCOM radio system based |
not all users require simultaneous access to communication channelsI |
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f you are using the internal KY58 cypher capabilities of the ARC210 radio, then which mode of SATCOM are you communicating |
KY58 mode for dedicated SATCOM voice communication |
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What is the relationship between the receive and transmit frequency ranges on the ARC210 DAMA SATCOM radio system |
there are two distinct bands, one for downlink and the other for uplink. The system receives on 243-270 MHz FM and transmitson 291-318 MHz |
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What is the purpose of emergency communications equipment |
to transfer intelligence during an emergency condition or situation |
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What are the emergency frequencies for the HF, VHF, UHF radio bands |
HF 8.364 VHF AM 121.5 VHF FM 40.5 UHF 243.0 |
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Why don't you transmit on a guard frequency for more than a few seconds |
bc the channels need to be kept clear for emergencies and bc automatic satellite systems report your transmission as a distress call |
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What are two types of personal emergency radios |
survival and parachute radios |
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What emergency frequency radio spectrum does the parachute radio transmit on |
UHF |
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What are the two fixed emergency frequencies the PRC 90 transmit on |
243.0 and 282.8 MHz |
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What are the three modes the PRC 90 personal emergency radio can operate in |
two way voice communications warbling (variable audio modulations) morse code |
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What are the three types of crash location transmitter systems |
CPI ELT UAB |
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What emergency communications system transmits pulses of HF sound |
UAB |
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How deep can the UAB be submerged and still operate |
up to 20,000 ft |
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UABs are commonly attached to which LRU |
cockpit voice recorder |
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How long can the UAB transmit |
approximately 30 days |
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How is inadvertent activation of the UAB prevented |
by a switch design that prevents the formation of a short circuit across the insulator |
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What causes the ELT to activate |
an impact along this longitudinal axis above a predetermined amplitude and time period |
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How long does the ELT continuously transmit |
until the self contained battery pack is exhausted or reset is selected on the control switch or ELT operation switch |
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What are the ELT emergency transmit frequencies |
VHF AM 121.5
UHF 243 |
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How many gs will the transmitter and antenna survive |
100 gs |
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What component is bypassed when you have the control unit switch set to TEST mode |
the impact sensor |
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For what is the g force reset switch used |
to reset the g force sensor circuits to their predetermined level after installation of the ELT or when jolts activate the sensor |
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How can you stop ELT transmissions |
by placing the control switch or the ELT operation switch in the RESET position |
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List the two functions of the interphone system |
amps the audio signals from various aircraft systems keys and modulates the radio transmitters |
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Describe the relationship between return lines and battery ground |
interphone systems, battery ground and the audio return lines for all interphone and audio producing units are grounded to the aircraft frame at the same single point |
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What is the reason for having audio common connected to ground at a single point |
to minimize the stray electromagnetic radiation picked up by the system |
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What is the function of the interphone control lines |
they determine whether a transceiver connected to the interphone system is either in transmit or receive condition |
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What's the purpose of the individual volume controls on the monitor switches of the C 6567 |
to compensate for weak audio of a particular system |
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What's the function of the rotary select switch on the C 6567 |
to allow the operator to select,monitor, key, and modulate any one of six radios or to listen and talk on the interphone |
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When is the CALL function used |
for emergency or high priority communications between crew members |
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During CALL operation, what is the purpose of the +17 to +29 volts DC |
this voltage is used to activate the AGC circuits in all aircraft control panels causing the audio signal to be heard |
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How will the CALL operation affect the interphone audio level |
CALL audio will be at least 6 dB louder than any other signals |
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What is the purpose of the hot mic function |
to give a crewmember the ability to talk to other aircraft interphone positions without having to press mic button |
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What interphone function allows you to listen to a TACAN id tone |
monitor |
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What is the function of the radio transmitter selection switch |
to enable a crewmember to control the keying and modulation of a selected transmitter or interphone |
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What is the advantage of two button operation over one button operation |
two button operation is where an operator may talk on the interphone line or on the selected radio transmitter without the need for operating the rotary selector switch on the interphone control panel |
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What are the interphone functions available when using the C 6624 bulkhead control panel |
to listen to hot mic, call, and interphone it also allows talk on call and interphone |
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How and where are status messages displayed to operators of the airborne digital interphone system |
each IACP has an eight digit display to provide the operator with status messages |
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When the KC 135 aircraft is connected to a receiver aircraft, how is the airborne digital interphone system connected to the receiver |
the ADIS is connected and interfaced through the CAIU with the receiver aircraft via Air Refueling comunication control unit |
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What audio signals are routed by the combined audio interface unit |
the CAIU routes radio navigation and warning signals to each operator headphones as selected by each individual IACP |
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How is maintenance BIT activated |
MBIT is activated by depressing the BIT pushbutton switch on the front panel |
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The ADIS system has how many external receptacles and what are the designations |
there are three external stations designated forward, main wheel well, and aft |
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How do you adjust individual volume levels on the interphone audio control panel |
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In transmit mode on the ADIS interphone audio control panel, when a transmitter is selected how is the corresponding monitoring pushbutton selected
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when a transmitter is selected, the audio monitoring pushbutton switch for that transmitter is auto selected |
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What is established by activating the intercom mode on the ADIS interphone audio control panel
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activating the intercom mode establishes an intercom conference among all operators who have the ICS button selected |
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List the aural warning signals prioritized by the ADIS interphone adapter unit in order of highest to lowest priority
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audio transformer box output then call alert chime |
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What type of output is tape converted to by the KOI-18
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a serial output |
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How many cryptographic keys can be stored in a KYK-13
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six |
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In the KYK-13, what indicates a key is stored in one of the six positions |
the red indicator will flash once when the initiate button is pushed while the MODE SELECT switch is in the OFF CHECK position |
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What is the function of the Z position on the mode select switch
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to zeroize the key in the selected address |
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How many lines are displayed on the CYZ-10 LCD display
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two |
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What is the function of the CYK |
to encrypt info stored in the DTD |
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How many microprocessors are contained in the DTD host/application section |
one |
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What keys on the keypad route directly to the COMSEC section of the DTD |
zero and on/off |
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What happens to classified operations when the CIK is removed
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classified operations are inhibited |
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How long are batteries expected to last during normal operational periods
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30 days |
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What is the default shut off time |
2 minutes |
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How do you enter the zeroize function of the CYZ-10 |
by pressing the zero key three times |
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When does a cold boot start up occur |
the first time the DTD is powered up after a zeroize, and every time the DTD is restarted after a battery charge that took longer than 2 minutes |
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How long does warm boot BIT take to complete
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between 30 and 60 seconds |
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What two types of secure voice communications can be selected by the pilot |
encrypted and decrypted |
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List four LRUs that make up the secure voice system
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KY 58 secure voice processor Z AHQ adapter KYK 13 fill device |
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What is the primary function of the KY 58 processor |
to provide the operator the capability to transmit and receive secure voice messages |
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What is the purpose of the Z AHQ adapter |
to allow the KY 58/TSEC to be integrated into existing KY 28 aircraft installations |
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What is the purpose of the KYK 13 fill device
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to transfer crypto variable into the KYK 58 processor |
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Why does the KY 58 processor require a battery
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to provide power to maintain the secure voice code |
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List the five modes of operation |
C cipher CO cipher only LD load RV receive variable |
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Which switch position on the processor FILL switch zeroize variable 1 through 5 only
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Z 1-5 position |
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What effect will placing the secure voice power switch in the TD position have on the transmitted signal
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the time delay (TD) position delays secure voice transmission for 800 ms |
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What is the function of the REM/LOC switch on the Z AHQ adapter |
to put the KY 58 processor in either the remote operation or the local operation. local operation is where the operator can control the system at the KY 58 location |
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What is the function of the FILTER switch on the Z AHQ adapter
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to improve low frequency response of the cipher signal prior to modulation and amplification in the radio |
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What components make up a KY100 narrowband system |
TSEC/KY 100 main terminal unit (MTO) Z AVH remote control a COMSEC mode control panel and a KY/RAD switch unit |
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What is the purpose of the equipment contained within the MTU |
to encode and decode the transmitted and receive audio signals |
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What does the Z AVH remote control allow for
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for operating modes to be selected and zeroizing of all codes presently loaded in the KY 100 MTU |
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Which component provides switching of plain text, guard, COMSEC, and mic audio (PTT) between AN/AIC18 interphone system, the command or V/UHF radio sets, and the KY 100 secure voice system
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KY/RAD unit |
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How is the secure voice system addressed
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AN/AIC 18 interphone system |
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Name two additional common narrowband secure voice units
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the ANDVT and KY 75
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