Cdc 2A851N Volume 3

Front 1

The primary reason the high-frequency radio uses single sideband modulation is

Back 1

that it provides many channels to operate on

Front 2

The typical high-frequency radio has

Back 2

280,000 channels spaced 100 hertz apart

Front 3

What is the transmitted frequency when a high-frequency radio control is set to 27.5 MHz, the signal is modulated by a 1000-hertz tone, and lower sideband mode is selected?

Back 3

27.499 MHz

Front 4

Which is true concerning high-frequency radio reception?

Back 4

Audio fidelity is higher than in ultra-high frequency radios

Front 5

Which is not a mode of operation for the ARC-190 high frequency radio system?

Back 5

FM

Front 6

You are using a learned preset for the ARC-190 high-frequency radio system. For this application, the transmit tune time is less than

Back 6

35 milliseconds

Front 7

Which version of the ARC-190 high frequency radio system receiver-transmitter must be installed to operate properly if the system has a CU-2275(V)1 high-frequency coupler installed?

Back 7

RT-1341V(1), RT-1341(V)2, or RT-1341(V)3

Front 8

In the ARC-190 high-frequency radio system, the high-frequency coupler matches the impedance of the antenna to the receiver-transmitter in order to

Back 8

give maximum power transfer

Front 9

A VHF FM radio is mainly used on aircraft that

Back 9

contact ground forces

Front 10

Which VHF radio system would have been the best chance of receiving a signal from a station located beyond the horizon?

Back 10

VHF FM

Front 11

Which VHF radio system uses two antennas?

Back 11

FM Homing

Front 12

On which frequencies can the ARC-186 VHF radio not transmit in the AM mode?

Back 12

108 to 115.975 MHz

Front 13

The frequency range of the ARC-186 VHF radio receiver in the FM mode is from

Back 13

30 to 87.975

Front 14

We call the C-11029/ARC-186 a true comm/nav control box because

Back 14

it controls both the VHF radio and VOR/ILS receiver

Front 15

How many frequencies are available for use by the main receiver in the ARC-164 UHF radio?

Back 15

7000

Front 16

The HAve Quick II frequency hopping pattern and rate is programmable by the 

Back 16

word-of-day

Front 17

The Have Quick II radio's entry  point in the frequency-hopping pattern is established by the word-of-day; however, it is actually programmed by

Back 17

the net number

Front 18

When not operating in the secure voice mode, two signals are received simultaneously on the same operating net, the Have Quick II radio automatically goes into conferencing. It does this by

Back 18

offseting the second transmitter frequency by 25 kilohertz

Front 19

An advantage of the remote Have Quick II configuration over the panel mount configuration in an aircraft is that it

Back 19

reduces cost by using existing aircraft wiring

Front 20

The HAVE QUICK II multiple word-of-day modification provided loading capacity that allows entry of up to 

Back 20

six words-of-day for 6 day use

Front 21

What LRU provides primary control of the ARC-210 radio system?

Back 21

Remote tuning panel

Front 22

Which LRU will automatically take over in the event of a failure in the ARC-210 radio system primary control method?

Back 22

Control display unit

Front 23

The remote tuning panel cannot control the ARC-210 radio system if the

Back 23

radio set control is turned on

Front 24

If the ARC-210 radio system high pass filter is inoperable, what symptoms may be present to the radio operator?

Back 24

Receiving FM commercial stations below 108 MHz

Front 25

What LRU is used to control the ARC-210 radio system in the event of a dual integrating processing failure?

Back 25

Radio set control

Front 26

How do you swap the active and standby frequencies of the ARC-210 sradio system using the remote tuning panel?

Back 26

Pressing the inner knob

Front 27

The ARC-210 radio system must be tuned within which frequency range to receive tactical/close air support information?

Back 27

30 to 87.975 MHz

Front 28

Which one of the following frequencies is not reserved for emergency use?

Back 28

8.0 MHz

Front 29

Oarachute emergency radios transmit on the 

Back 29

UHF emergency frequency

Front 30

The PRC-90 hand-held emergency radio transmits on what two fixed channels?

Back 30

243.0 and 282.8 MHz

Front 31

Which one of the following is not an operating mode of the PRC-90 emergency radio?

Back 31

Three-way voice communications

Front 32

The emergency communications system that deploys from the aircraft before or at impact to give it a better chance of surviving a crash is the 

Back 32

Crash position indicator

Front 33

The emergency communications system that emits pulses of high-frequency sound is the 

Back 33

underwater acoustical beacon

Front 34

The underwater acoustical beacon can operate in fresh or salt water to a depth of 

Back 34

20000 feet

Front 35

Inadvertent activation of the underwater acoustical beacon from moisture is prevented by

Back 35

a switch design

Front 36

When activated, the emergency locator transmitter continuously transmits on frequencies 

Back 36

121.5 and 243.0 MHz

Front 37

What switch on the emergency locator transmitter resets the impact sensor circuits to 

Back 37

g-force reset switch

Front 38

One purpose of the interphone system is to

Back 38

provide a means of keying and modulating the radio transmitters

Front 39

The term used to describe the lines used to determine whether a tranceiver connected to the interphone system will be in the transmit or receive condition is

Back 39

control lines

Front 40

The C-6567/AIC-25 interphone set control

Back 40

has eight monitor/volume controls that are switches and potentiometers

Front 41

The purose of the +17 to +29 VDC on the CALL control line of the C-6567 is to 

Back 41

activate the AGC circits in the headset amplifiers

Front 42

The CALL switch applies a DC voltage to the CALL control line and activates the AGC circuits in all aircraft control panel's headset amplifiers causing the CALL audio to be heard at least how many dB louder han any other signals present?

Back 42

6

Front 43

Which crewmembers will recieve messages during hot-mic operation?

Back 43

Only those with the hot-mic listen switch activated

Front 44

Which transmission operation of the interphone system is most advantagous to pilots/copilots?

Back 44

Two-button operation because it allows pilot/copilot to talk on radios and maintain comm with crew

Front 45

The C-6624/AIC-25 allows a crewmember to talk on the

Back 45

CALL and interphone functions

Front 46

The major difference between the U-92A/U and the U-94A/U jack is the

Back 46

U-94A/U jack has a PTT button

Front 47

When connecting the WM-85/U inerphone cable to the U-94 A/U, what wire color is connected to the PTT button on the U-94 A/U?

Back 47

Yellow

Front 48

Which is not a level of BIT on the ADIS?

Back 48

Degraded bit

Front 49

The ADIS interphone audio control panel provides monitoring facilities for listening to audio signals on how many possible channels?

Back 49

10

Front 50

The VOL adjustment on the ADIS interphone audio control panel allows the operator to

Back 50

adjust combined received signals simultaneously or individually

Front 51

The formward external interphone receptacle in the ADIS system allows the operator to transmit on a radio, even though the other two external receptacles cannot, because it is connected to the

Back 51

boom operator's forward IACP

Front 52

On the ADIS, when either the crew compartment or boom compartment is in the local ICS mode, no communication between the front and back can occur without the use of the 

Back 52

CALL function

Front 53

When CALL mode is activated on the ADIS, all radios (excluding aural warnings) are

Back 53

decreased to 6 dB of max volume

Front 54

When the ADIS is in emergency mode, IACP #3 is directly connected to 

Back 54

HF radio #1

Front 55

When the ADIS interphone adapter unit passes priority one input signals, the signals are passed

Back 55

without signal level adjustment

Front 56

IF you need to store 12 cryptographic keys, then how many KYK-13 devices will you require?

Back 56

2

Front 57

The capability of the KYK-13 to connect to different crypto units or another KYK-13 is provided by

Back 57

two chasis mounted six-pin connectors

Front 58

If the mode select switch on the KYK-13 is set to OFF CHECK and the user presses the INITIATE button, then the KYK-13 will

Back 58

verify presence of a single stored key

Front 59

When checking the KYK-13 for stored crypto keys, the presence of a valid key is indicated by

Back 59

one red indicator flash

Front 60

Which control  on the KYK-13 transfer device transfers a key into the selected storage address?

Back 60

Initiate button On

Front 61

Why does the KYK-13 parity light flash on and off continously?

Back 61

Because key transfer was prevented

Front 62

Which of the following is not a primary purpose of the CYZ-10 data transfer device?

Back 62

Process host/application data

Front 63

The CYZ-10 has a sealed case with only

Back 63

three external openings

Front 64

If the CYZ-10 is placed in long-term storage in the OFF condition, then batteries are expected to last approximately

Back 64

119 days

Front 65

What is the purpose of the DTD zeroize function?

Back 65

To erase all battery backed memory in the DTD

Front 66

What KY-58 LRU has the primary function of transmitting and receiving secure voice messages?

Back 66

TSEC secure voice processor

Front 67

Which one of the following units is needed to transfer crypto variables into the KY-58 processor?

Back 67

KYK-13 fill device

Front 68

What is the purpose of the KY-100 main terminal unit?

Back 68

Encodes and decodes transmitted and received audio signals

Front 69

Which of the following is not a function of the COMSEC mode control panel?

Back 69

Allows selected radio audio signals to be passed through the intercom

Front 70

The crewmembers address the secure voice system through the 

Back 70

interphone system