Understanding Signals and the headend
31 important questions on Understanding Signals and the headend
In what frequency bands are over-the-air signals originating from local broadcast stations?
Over-the-air signals originate from local broadcast stations in the VHF (channels 2-13 or 54-88 MHz/174-216 MHz) and UHF (channels 14-69 or 470-806 MHz) frequency bands.
OTA broadcast signals are acquired at the headend using?
What is a yagi antenna?
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What are log periodic antennas?
How does the cable operator receive broadcast signals from far away communities?
How do transponders on most commercial communications satellites receive and transmit satellite signals?
How does the cable operator acquire signals from satellite transponders?
How did "community antenna television" systems operate?
How can analog signals be described?
How can digital signals be described?
What are three methods in which a carrier is "shaped" to contain the original signal?
How are the video, audio, and color carriers each modulated?
Name two unique properties of microwave bands.
What happens once microwave signals are received?
Describe the difference between FM and AML microwave transmission techniques.
What is a geosynchronous orbit?
Satellites used in transmitting cable programming orbit the Earth at an altitude of about 22,300 miles. This is called a geosynchronous orbit because such satellites maintain their position relative to a particular point on the surface of the Earth at all times. They actually orbit in exact synchronization with the rotation of the Earth and thus appear to stationary in the sky.
How do satellites take advantage of each transponder's 36 MHz capacity more efficiently?
What are the uplink and downlink satellite frequencies in the C- and Ku-bands?
Uplink frequencies, which programmers use to send signals to the satellite from a ground-based transmitter, are at 5.9-6.4 GHz. Downlink frequencies, which are used when the satellite delivers its signals to TVRO antennas, are situated between 3.7 and 4.2 GHz. These frequencies are referred to as the C-band. To reduce interference in the C-band, newer satellites operate in the Ku-band, uplinking at 14-14.5 GHz and downlinking at 11.7-12.2 GHz.
What is the purpose of the TVRO antenna's parabolic shape?
What happens to the satellite signal once it is received by the feedhorn?
What happens as the digital signals are downlinked at the headend?
What does each satellite receiver in the headend do?
What do filters in the headend do?
What is the function of test equipment in the headend?
What does EAS equipment do?
What are frequency-agile modulators?
What happens after the processing and modulation steps are performed and the RF signals are ready for transmission?
During the 1980's, what led to the expansion in the cable system channel capacity
Digital and analog signals are different in that
In the cable antenna relay service (CARS)
A satellite transponder
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