150 Quiz Test Flashcards
Pass at all cost
In what year did DIRECTV launch it’s first satellite?
1993
What is DIRECTV’s vision?
Make DIRECTV the best television experience in the world
Identify some of the causes of a weak signal. Select all that apply.
- Damaged cable
- Improperly placed ODU
- Stapled cable
- Water inside cable
All of the above
Define communications satellite?
Man-made equipment that orbits the Earth in a defined orbit
What is a geosynchronous orbit?
A circular orbit directly above the equator, 22,300 miles from Earth
Define azimuth relative to ODU pointing?
The horizontal (left or right) adjustment that will point the ODU at the DTV satellite
What does CONUS mean?
Continental United States
What is the primary purpose of Spot Beams
Spot Beams focus on satellite signals in specific areas, allowing DIRECTV to reuse the same frequencies or transponders of the country
What are the frequencies of the Ka band?
18.3 to 20.2 GHz
What is the drop off of signal (dBm) loss over a distance known as?
Attenuation
In telecommunications, what is a waveform (usually a sine wave) that is modulated or modified in an input signal for the purpose of conveying information an example of?
A carrier wave
What signal is used by the IRD to communicate with the SWiM network?
The FSK signal
What determines the capacity for transmitting information of a specific channel?
The bandwidth of the signal
What is the difference in dB from the noise floor and the peak of the signal known as?
Signal-to-Noise Ratio
As the signal travels from the satellite to the ODU, it spreads out and loses strength. What is used to recover that signal at the ODU?
A high gain antenna (reflector) and an amplifier within the LNB
What is the approximate minimum signal level, as measured with the AIM, that you should see at the IRD before you consider it good?
-55 dB
What is the celling threshold of the signal power for IRD to operate correctly?
-25 dBm
What frequency does the FSK utilize?
2.3 MHz
What are the main functions of the LNB?
To amplify and down-convert signal
Why must the downlink frequencies be down converted to lower frequency range?
To protect against attenuation, or the dropping off of signal over distance
To what frequency is the Ku band down-converted for delivery to the customer’s home?
950-1450 MHz
Which of the following pieces of equipment do all DIRECTV installations have in common?
An integrated Receiving Device (IRD)
Which of the following devices are used in both the initial site survey and in troubleshooting? Select all that apply:
- Electrical outlet tester
- Signal level meter
- Inclinometer
- Volt/Oh meter
- Electrical outlet tester
- Signal level meter
Who should you call to assist you in satisfying your customer with a upgraded service package?
Technician Service Center (TSC)