EARTH SEGMENT
1. Define earth segment.
Earth
segment of a satellite communication system consists of transmit earth station
and receive earth station.
Example
: TV Receive Only systems (TVRO systems)
2. Give the difference between
KU-band and the C-band receive only systems.
Operating
frequency of outdoor unit.
3. What is mean by ODU and IDU.
ODU
– The Home Receiver Outdoor Unit
IDU
– The Home Receiver Indoor Unit
4. Explain about MATV system.
MATV
– Master Antenna TV system.
It
is used to provide reception of DBS TV channels to the user group.
Example
: Apartment users It consists of one outdoor unit and various indoor units.
Each user can independently access all the channels.
5. Write about CATV system.
CATV
– Community Antenna TV system.
As
in MATV system, it consists of oneoutdoor unit and separate feeds for each
sense of polarization.
6. Define S/N ratio.
The
S/N introduced in the preceding section is used to refer to the ratio of signal
power to noise power at the receiver output. This is known as S/N ratio.
7. What is noise weighting?
The
method used to improve the post detection signal to noise ratio is referred to
as noise weighting.
8. What is an EIRP?
EIRP
means Equivalent Isotropic Radiated Power. It is a measure of radiated or
transmitted power of an antenna.
9. What is noise power spectral
density?
Noise
power per unit Bandwidth is termed as the noise power spectral density.
10. What is an inter modulation
noise?
Inter
modulation distortion in high power amplifier can result in signal product
which appear as noise and it is referred to as inter modulation noise.
11. What is an antenna loss?
It
is added to noise received as radiation and the total antenna noise temperature
is the sum of the equivalent noise temperature of all these sources.
12. Define noise factor.
An
alternative way of representing amplifier noise is by means of its noise
factor. In defining the noise factor of an amplifiers, usually taken as 290 k.
13. A satellite downlink at 12 GHz
operates with a transmit power of 6 W and an antenna gain of 48.2 dB. Calculate
the EIRP in dBW.
EIRP
= 10 log 6 + 48.2 = 56 dBW
14. The range between a ground
station and a satellite is 42000 km. Calculate the free space loss a frequency
of 6 GHz.
[Free
space loss] = 32.4 + 20 log 42000 + 20 log 6000 = 200.4 dB
15. Define Saturation flux density.
The
flux density required at the receiving antenna to produce saturation of TWTA is
termed the saturation flux density.
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