What balance the gravitational pull of the earth to allow the satellite to stay on its orbit?
Centripetal force
ECE Board Exam November 2000
Satellite that rotates around the earth in a low-altitude elliptical or circular pattern.
Nonsynchronous satellite
ECE Board Exam April 1999
In a transoceanic satellite conversation, how much is the typical delay before a reply is heard?
600 ms
ECE Board Exam November 1999
What are the repeaters inside communications satellite known for?
Transponders
ECE Board Exam April 2000
Under a circular satellite orbiy, how high is a certain satellite located above the surface of the earth if the total satellite height is 9869 miles?
ECE Board Exam November 1998
Is a kind of satellite which has a period of revolution equivalent to the period if rotation of the earth about its axis.
Geosynchronous satellite
ECE Board Exam April 1998
A radio land station in the land mobile service.
Base station
ECE Board Exam November 1997
The use of telecommunication for automatic indicating or recording measurement at the distance from the measuring instrument.
Telemetry
ECE Board Exam April 1997
_______________ is the horizontal pointing angle of an antenna.
Azimuth
ECE Board Exam November 1996
How many satellite orbital slots are requested by the Philippine government from ITU?
6
ECE Board Exam MArch 1996
The point on satellite orbit, closest to the earth is
perigee
ECE Board Exam April 2001
A mobile service between base stations and land mobile stations or between land mobile stations.
Mobile service
ECE Board Exam November 2000
Which of the following refers to the basic component of a communication satellite receiver?
Transponder
ECE Board Exam April 2000
Determine from the following the basic technique used to stabilize a satellite.
Spin
ECE Board Exam November 1999
A space distance iin satellite communication from the earth, to or greater than 2,000,000 kilometers is referred to as ___________.
deep space
ECE Board Exam April 1999
How many satellites does the GPS system consist?
24 satellites
ECE Board Exam November 1999
Which point on the satellite orbit is closest to the earth?
perigee
ECE Board Exam November 1998
Which of the following is refers to the smallest beam of a satellite antenna's radiation pattern?
spot beam
ECE Board Exam April 1998
A major and basic advantage for the use of klystron.
Hiigh power
ECE Board Exam November 1997
Station in the mobile service not intended to be used while in motion.
Land station
ECE Board Exam April 1997
__________ detects the satellite signal relayed from the feed and converts it to an electric current, amplifies and lower its frequency.
LNB
ECE Board Exam November 1996
Collects very weak signals from a broadcast satellite.
Satellite dish
ECE Board Exam March 1996
It is a spacecraft replaced in orbit around the earth carrying onboard microwave receiving and transmitting equipments
Communications satellite
ECE Board Exam April 2001
A what apogee in an elliptical orbit must a geosynchronous satellite be initially stationed before it is finally fired into its final geostationary orbit?
22,300 miles
ECE Board Exam November 2000
Satellite orbit around the earth are either:
they are either circular or elliptical
ECE Board Exam April 2000
Satellite system or part of a satellite system, consisting of only one satellite and the cooperating stations.
Satellite network
ECE Board Exam November 1999
A resultant effect in launching a satellite from the earth caused by both forward motion away from the earth that provides inertia tending the satellite to travel in straight line upwards and the gravitational pull towards the earth is referred to as ___________.
centripetal acceleration
ECE Board Exam November 1998
Which of the following refers to the first active satellite?
Sputnik 1
ECE Board Exam April 1998
A band where most military satellite often operate.
X
ECE Board Exam November1997
Known to be the first satellite capable to receive and transmit simultaneously.
Telstar I
ECE Board Exam April 1997
What kind of battery panels are used in some advanced satellites?
Gallium arsenide solar panels
ECE Board Exam November 1996
Satellite signal transmitted from a satellite transponder to earth's station.
Downlink
ECE Board Exam November 1999
In satellite communications where satellites revolve in an orbit that forms a plane passing through the center of gravity of the earth, this center is called ____________
geocenter
ECE Board Exam April 1998
The use of telecommunication for the transmission of signals to initiate, modify or terminate functions of equivalent at a distance.
Telecommand
ECE Board Exam November 1997
The use of telecommunication for the transmission of signals to initiate modify or terminate functions of equipment at a distance.
Telecommand
ECE Board Exam April 1997
Footprint refers to coverage area in the globe.
Satellite coverage
ECE Board Exam November 1996
The first commercial satellite
Early bird
ECE Board Exam November 1996
What band does VSAT first operate?
C-band
ECE Board Exam April 2001
Which part of transponder converts the received signal to another lower frequency?
Mixer
ECE Board Exam April 1998
In satellite communications, the geostationary satellites are conveniently located with respect to the equator at __________.
0 degrees latitude
ECE Board Exam November 1997
The Ku-band in the satellite service.
14/11 GHz
ECE Board Exam April 1997
Asia Sat I covers how many countries in Asia?
38
ECE Board Exam November 1996
Satellite engine uses
ion propulsion system
ECE Board Exam April 2001
How do you increase or double the channel capacity of a satellite without increasing the frequency bandwidth?
Re-use frequency
ECE Board Exam April 1998
A satellite beam that covers almost 42.4% of earths surface.
Global beam
ECE Board Exam November 1997
Receives and collects satellite signals from a broadcast satellite.
Satellite disk
ECE Board Exam April 1997
Sound intensity level is __________
10 log I/Iref
ECE Board Exam November 1996
The first passive satellite transponder.
Moon
ECE Board Exam April 1998
The most common application of satellite
Communications
ECE Board Exam November 1997
Radio communication operation service between mobile and land stations or between mobile stations.
Mobile service
ECE Board Exam April 2001
Referred to as function and/or a designed of a double conversion satellite transponder.
Equipped with two mixers
ECE Board Exam November 2000
How does spatial isolation technique in satellite communications avoid interference?
Employment of highly directional spot-beam antennas
ECE Board Exam April 1998
One of the first satellite systems catering personal based communications services scheduled for operation.
Iridium system
ECE Board Exam NOvember 1997
A radio communications service used in radio regulation between specified fixed points provided primarily for the safety of air navigation and for the regular efficient and economical air transport.
Aeronautical Fixed Service
ECE Board Exam November 1999
When do you consider that there is a satellite pass, having reference from the ground?
When satellite passes at its orbit at 90 degrees from its azimuth.
ECE Board Exam April 1998
Station located on an object which is beyond and is intended to go beyond the major portion of the earths athmospehere.
Space Station
ECE Board Exam November 1997
An earth satellite whose period of revolution is equal the period of rotation of the earth about its axis.
Geosynchronous
ECE Board Exam April 1998
Known as the satellite transmitted signal from a satellite transponder to earths station.
Down link
ECE Board Exam November 1997
A satellite receives an uplink frequency of __________ MHz from a ground station of 3700 MHz.
ECE Board Exam April 1998
What do you call the signal booster installed on the antenna dish of satellite receiver?
Low noise amplifier
ECE Board Exam November 1997
Which of the following refers to the smallest beam of satellite antennas radiation pattern?
Spot Beam
ECE Board Exam April 1998
Referred by a radio regulation as the station in the mobile service not intended to be used while in motion
Land Station
ECE Board Exam November 1997
Satellite system or part of a satellite system, consisting of only one satellite and the operating earth station.
satellite network
ECE Board Exam April 2001
Typical bandwidth of a communications satellite.
500 MHz
ECE Board Exam November 2000
An area on earth covered by a satellite radio beam.
Footprint
ECE Board Exam April 1999
A twenty four (24) satellite system used in modern telecommunications to determine a location(s) on the surface of the earth.
GPS
ECE Board Exam April 2001
Which type of satellite transponder improves the S/N ratio which demodulates the up-link signal to recover the baseband signals and use them to remodulate the downlink transmitter?
Baseband
ECE Board Exam April 1998
In shipboard satellite dish antenna system, azimuth is referred as the __________
horizontal aiming of the antenna
ECE Board Exam November 1997
Refers to a land station in a maritime mobile service.
Coast station
ECE Board Exam November 1998
__________ is known to be the first satellite capable of receiving and transmitting simultaneously.
Telstar I
ECE Board Exam April 1998
What is the frequency range of C-band?
3.4 to 6.424 GHz
ECE Board Exam November 1997
An area on the surface of the earth within the boresight of the steerable satellite beam intended to be pointed.
Effective boresight area
ECE Board Exam April 1998
What is the approximate percentage of earth's coverage of a geostationary satellite at zero degree elevation?
42.5 %
ECE Board Exam April 2001
One of the following devices in satellite transponder serves as output of the receive antenna.
low noise amplifier
ECE Board Exam November 2000
In a re-use frequency technique of increasing satellite channel capacity of corresponding transponders, how do you control the antenna used to prevent interference?
High directional antenna
ECE Board Exam November 2000
Refers to a mobile earth station in the mobile-satellite service located on board ship
Ship earth station
ECE Board Exam April 2001
A technique in satellite communications which uses a highly directional spot-beam antenna to prevent interference from frequency sharing.
Frequency re-use technique
ECE Board Exam November 2000
How do you determine the satellite location in latitude and longitude measurement?
Designate a point on earth directly below the satellite
ECE Board Exam November 2000
A point in the satellite orbit known to be the closest location to the surface of the earth.
Perigee
ECE Board Exam November 2000
Which satellite transponder has the most number of mixers?
Double-conversion
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