3c251 vol 4 cdc's ures
The longer distances involved in communications with forces in Europe
The need for more reliable high-capacity communications
The development of line of sight (LOS) communications
The need for more resistance to nuclear blast
Direct and surface
Sky and surface
Ground and sky
Direct and sky
Reflection
Refraction
Diffraction
Diffusion
Less dense and at a lower altitude
More dense and at a lower altitude
Less dense and at a higher altitude
More dense and at a higher altitude
Frequency of optimum traffic
Maximum usable frequency
Most usable frequency
Critical frequency
An active system
A passive system
A synchronous system
A low-altitude
It can't amplify signals
It orbits the earth in a figure eight pattern
The transmitted frequency is below 10-gigahertz (GHz)
The two-way propagation delay is about 0.6 seconds
10 gigahertz (GHz)
8 GHz
6 GHz
4 GHz
Faraday effect
Doppler effect
Free space attenuation
None of the above
Transmit frequency drift
Transmit frequency drift off the phase-lock ground receivers
The satellite's motion in space relative to ground stations
Rotation of the polarization of radio waves
Earth
Space
Orbital
Control
Station keeper
Satellite amplifier
Satellite transponder
Regenerative repeater
An active satellite and one earth terminal
An active satellite and two earth terminals
Two active satellites and one earth terminal
Two active satellites ans two earth terminals
Satellite control
Station keeping
Satellite ground track
Communications control
Spread spectrum multiple access (SSMA)
Frequency division multiple access (FDMA)
Demand assignment multiple access (DAMA)
Time division multiple access (TDMA)
Power
Frequency
Synchronization
Transponder complexity
Frequency division multiple access (FDMA)
Time division multiple access (TDMA)
Spread spectrum multiple access (SSMA)
Band spreading multiple access
Defense logistics agency
Communications squadron
Air force communications agency
Defense information systems agency (DISA)
End offices are multiple-homed
End offices do not interoperate with allied networks
The DSN offers precedence access thresholding (PAT)
The DSN offers single mulitlevel precedence and preemption (MLPP)
End offices are multiple-homed
End offices do not interoperate with allied networks
The DSN offers precedence access thresholding (PAT)
The DSN offers single mulitlevel precedence and preemption (MLPP)
Flash
Priority
Intermediate
Flash override
Flash
Priority
Intermediate
Flash override
KG-84
KG-94
KIV-7
Secure telephone unit- III (STU-III)
Access line protocol functions
Network management functions
Internal call processing features and functions
Administrative, operations and maintenance functions
A secure telephone unit -III (STU-III) cannot make calls through a RSU
Precedence calling is not available with RSU
RSU can become saturated and deny all service
RSU can become isolated from the parent switch
Wait!
Here's an interesting quiz for you.