2A251 Volume 3 UREs
- 1.The primary reason a high frequency (HF) radio uses single sideband (SSB) modulation is
- A.
That fidelity is greatly increased
- B.
The system can use a very wide-band pass
- C.
The transmitter output power is 10 watts
- D.
That it provides many channels on which to operate
- 2.What is the transmitted frequency when a high frequency (HF) radio control is set to 25.000-megahertz (MHz), with a signal modulated by a 1000-hertz tone, when the lower sideband mode is selected?
- A.
24.500 MHz
- B.
24.999 MHz
- C.
25.001 MHz
- D.
25.000 MHz
- 3.Which is not a mode of operation for the ARC-190 high-frequency radio system?
- A.
Frequency modulation (FM)
- B.
Upper sideband (USB) data
- C.
Lower sideband (LSB) voice
- D.
Amplitude modulated equivalent (AME)
- 4.You are using a learned preset for the ARC-190 high-frequency (HF) radio system. For this application, the transmit tune time is less than
- A.
5 milliseconds
- B.
25 milliseconds
- C.
35 milliseconds
- D.
50 microseconds
- 5.This version of the ARC-190 high-frequency (HF) radio system receiver-transmitter (RT) only operated properly if the system has a CU-2275(V)1 HF antenna coupler installed?
- A.
RT-1341(V)1
- B.
RT-1341(V)2
- C.
RT-1341(V)3
- D.
RT-1341(V)4
- 6.In the ARC-190 high-frequency (HF) radio system, what helps prevent high voltage arcing within the HF coupler at high altitudes?
- A.
Sealed tuner assembly
- B.
Sealed control compartment
- C.
Pressurized tuner assembly
- D.
Pressurized control compartment
- 7.The external blower for an ARC-190 high-frequency radio system is overheating. This situation will cause a receiver-transmitter (RT) fault and
- A.
Keep the coupler from tuning
- B.
Reduce the external blower speed
- C.
Cause the RT fault light to turnoff
- D.
Keep the transmitter from functioning
- 8.A very-high frequency (VHF) frequency modulated (FM) radio is mainly used on aircraft that
- A.
Contact ground forces
- B.
Contacts airborne tankers for fuel
- C.
Uses Air Force controlled airfields
- D.
Is controlled by civilian air traffic controllers
- 9.Which very-high frequency (VHF) radio system would have the best chance of receiving a signal from a station located beyond the line of sight (LOS)?
- A.
VHF amplitude modulated (AM)
- B.
VHF omnirange (VOR)
- C.
VHF frequency modulated (FM)
- D.
Localizer/glideslope
- 10.Which very-high frequency (VHF) radio system uses two antennas?
- A.
Frequency modulated (FM) homing
- B.
Amplitude modulated (AM) communications
- C.
FM communications
- D.
AM direction finder
- 11.The frequency range of the ARC-186 very-high frequency (VHF) radio receiver, in only the receive amplitude modulated (AM) mode, is this megahertz (MHz) range
- A.
30 to 87.975
- B.
38 to 87.975
- C.
108 to 151.975
- D.
116 to 151.975
- 12.Which frequencies can the ARC-186 very-high frequency (VHF) radio not transmit with in the amplitude modulated (AM) mode?
- A.
30 to 87.975 megahertz (MHz)
- B.
38 to 87.975 MHz
- C.
108 to 115.975 MHz
- D.
116 to 151.975 MHz
- 13.We call the C-11029/ARC-186 a true communications/navigation (comm/nav) control box because
- A.
Rivet work force changed its design
- B.
It controls the very-high frequency amplitude-modulated (AM) and frequency modulated (FM) systems
- C.
It controls both the very-high frequency (VHF) radio and the VHF-omnirange/instrument landing system (VOR/ILS) receiver
- D.
Automatic direction finding and homing share similar communication and navigation systems' characteristics
- 14.How many frequencies are available for the tunable main receiver to use in the ARC-164 ultra-high frequency (UHF) radio?
- A.
10000
- B.
7000
- C.
3500
- D.
700
- 15.How do Have Quick (HQ) radios resist jamming?
- A.
Frequency-hopping
- B.
Retransmission
- C.
Encryption
- D.
Phase shifting
- 16.The Have Quick II radios' frequency-hopping pattern and rate is programmed using this feature
- A.
Time-of-day
- B.
Word-of-day
- C.
Net number used
- D.
Universal time coordinated
- 17.Have Quick II radios frequency hop at the same instant in time because they
- A.
Use the same net number
- B.
Use time-of-day information
- C.
Have the same word-of-day entered
- D.
Are equipped with internal atomic clocks
- 18.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 using the
- A.
Time-of-day
- B.
Net number
- C.
Multiple word-of-day
- D.
Universal time coordinated
- 19.When two signals are received simultaneoulsy on the same operating net, the Have Quick II radio automatically goes into conferencing. It does this by
- A.
Resetting the net number for communication
- B.
Setting the receiver to narrowband reception
- C.
Injecting a beat frequency to prevent loss of intelligence
- D.
Offsetting the second transmitter frequency by 25 kilohertz
- 20.The HAVE QUICK II panel-mount configuration is primarily used in
- A.
Retrofit situations
- B.
Bomber aircraft
- C.
Cargo aircraft
- D.
New aircraft
- 21.What is the advantage of the remote Have Quick II configuration over the panel mount configuration in an aircraft?
- A.
More convenient for maintenance
- B.
Can be used with a remote channel indicator
- C.
Reduced cost by using existing aircraft wiring
- D.
Can be used with a ultra-high frequency direction finding system
- 22.The HAVE QUICK II multiple word-of-day (MWOD) modification provided loading capability to allow entering up to how many words for what number of days usage, respectively?
- A.
Two; 2 days use
- B.
Four; 4 days use
- C.
Six; 6 days use
- D.
Eight; 8 days use
- 23.Which component takes over control in the event of an ARC-210 radio system remote tuning panel's failure?
- A.
Radio set control
- B.
Control display unit
- C.
Remote tuning panel
- D.
Remote volume control
- 24.The remote tuning panel can not control the ARC-210 radio system if the
- A.
Radio set control is turned on
- B.
Radio set control is turned off
- C.
Remote volume control is turned on
- D.
Remote volume control is turned off
- 25.A high pass filter is installed on the ARC-210 radio system to
- A.
Attenuate frequency-modulated (FM) commercial stations below 108 megahertz (MHz)
- B.
Attenuate FM commercial stations above 108 MHz
- C.
Bleed over aircraft FM transmissions below 108 MHz
- D.
Bleed over airraft FM transmissions below 108 MHz
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