DTH System

DTH System
by
retagged

1 Answer

Answer :

image


Outdoor unit: It consists of a receiving antenna, low noise amplifier & converter the receiving antenna is parabolic reflector with a horn as the active element. The horn can be directly in front of reflector, or it may use an offset feed as shown in fig. The reflector diameter may be 0.6m for 11GHz & still smaller for K &Ka bands. The low noise block consists of a low noise wide band amplifier followed by a convertor. The output of convertor consists of a signal of UHF frequency ranging from 950-1450MHz. The advantage of using UHF frequency is that a low cost coaxial cable can be used as feeder from the outdoor unit to the indoor unit. LNB cannot be kept indoor because long cable between horn & the first amplifier will cause substantial degradation of the overall noise figure of the set.



Indoor unit: The wideband signal from the LNB is fed to an RF amplifier. The amplified signal is fed to a channel selector circuit which selects the wanted band. The selected channel is down converted to a fixed IF of 70MHz by local oscillator & mixer. IF amplifier amplifies the signal which then goes to FM detector. The detector recovers original baseband signal, consisting of CVS & audio signal. These modulated signals are fed to the normal domestic TV receiver, which after due processing reproduces picture & sound. 

by

Related questions

characteristics of Hi-Fi amplifier system.

Description : characteristics of Hi-Fi amplifier system.

Last Answer : Characteristics of HI-FI amplifier: 1. Signal to noise ratio should be better than 50dB. 2. Frequency response should be flat within +-1dB. 3. Nonlinear distortion should not be more ... provided. 6. Environmental conditions should be such as to eliminate the external noise in listening room. 

Describe the function of MUSE system for HDTV.

Description : Describe the function of MUSE system for HDTV.

Last Answer : Bandwidth can be reduced by MUSE (Multiple Sub -Nyquist Sampling Encoding) system MUSE stands for Multiple Sub-Nyquist sampling encoding and is an HDTV bandwidth compression schemedeveloped by ... digital Audio system is called DANCE (Digital Audio Near-Instantaneous Compression and expansion). 

requirements of a distribution system

Description : requirements of a distribution system

Last Answer : Following requirements of a distribution system.  1. Layout should be simple in design. 2. It should have less initial cost 3. The distribution system should have minimum distribution ... stability of existing distribution system. 15. Time required for completion of work should be less. 

Why radial distribution system used for short distance ?

Description : Why radial distribution system used for short distance ? 

Last Answer : Because of following disadvantages radial distribution system is not used for long distance:  Since there is only one feeder to DTC feed at one point so, 1) There is no reliability ... more time for fault finding & repairing Hence radial distribution system is used for short distance.

vertical deflection system and explain its operation.

Description : vertical deflection system and explain its operation.

Last Answer : The main function of the vertical deflection system , is to provide an amplified signal of proper level to derive the vertical deflection plates without any distortion. For amplification of the ... suppression, reduced nonlinear effects because none of the plates are at ground potential.

Working of Simple Vapor absorption system

Description : Working of Simple Vapor absorption system

Last Answer : Working of Simple Vapor absorption system:  A Simple Vapor absorption system consists of evaporator, absorber, generator, condenser, expansion valve, pump & reducing valve. In this system ammonia ... where there is scarcity of Electricity and it is very useful at partial and full load. 

Draw block diagram of CNC system and state function of each block.

Description : Draw block diagram of CNC system and state function of each block.

Last Answer : (i) Input Devices: These are the devices which are used to input the part program in the CNC machine. There are three commonly used input devices and these are punch tape reader, magnetic ... Unit: A monitor is used to display the programs, commands and other useful data of CNC machine. 

Write four advantages of FMS (Flexible Manufacturing System).

Description : Write four advantages of FMS (Flexible Manufacturing System).

Last Answer : 1. Large variety of same products 2. Profitable investment. 3. Requires limited inventory. 4. Low labor cost. 5. Flexible system. 6. Speedy production. 7. Improve product quality. 

List and explain the components of a hydraulic system.

Description : List and explain the components of a hydraulic system.

Last Answer : Components Hydraulic: Hydraulic pump- Supply fluid to the components in the system. Pressure in the system develops in reaction to the load. Hence, a pump rated for 5,000 ... mechanical components and need to be removed along with other contaminants.  Seals, fittings and connections.

Explain how MEMS accelerometer is used as airbag sensor for car system.

Description : Explain how MEMS accelerometer is used as airbag sensor for car system.

Last Answer : MEMS Accelerometer is used as airbag sensor: Mechanical ignition airbags fit inside the steering wheel pad. When a collision occurs, the inertial sensor moves, setting off a ... the airbag with wiring. This is especially effective when fitting both driver- and passenger-side airbags.

What are advantages and disadvantages of Mechatronics system?

Description : What are advantages and disadvantages of Mechatronics system? 

Last Answer : Advantages of Mechatronics system:  High level of integration.  Increased functionality and better design.  More use of electronics and software instead of mechanical function.  Assumes ... Its replacement is difficult, that it is difficult to change old system to new system. 

Explain in brief how anti-lock braking system works

Description : Explain in brief how anti-lock braking system works

Last Answer : An ABS is a system on motor vehicles which prevents the wheels from locking while braking stopping safely is one of the most important functions a motor vehicle can perform. Diagram: ... to decrease the pressure on the braking circuit, effectively reducing the braking force on that wheel.

Differentiate between pneumatic and hydraulic system.

Description : Differentiate between pneumatic and hydraulic system. 

Last Answer : Pneumatic System Hydraulic System 1 Pneumatic system uses gas for power transmission, after compression and it is used as medium for carrying out mechanical work. ... : In industrial applications, air conditioners Applications: In petrochemical industries, oil refineries.

Explain the Mechatronics system with the help of block diagram and labeled the various elements.

Description : Explain the Mechatronics system with the help of block diagram and labeled the various elements. 

Last Answer : The key elements of Mechatronics systems can be classified under following categories:  Information systems  Mechanical systems  Electrical systems  Computer systems  Sensor and actuators  ... is adjusted based on generated error and again signal is given to actuators and sensors.

Describe the procedure for working of paging system.

Description : Describe the procedure for working of paging system.

Last Answer : Pager is a Simplex Communication Device. Paging Systems are communication systems that send messages to a subscriber. Message can be numeric or alphanumeric. Paging Systems are used to notify a subscriber ... message is sent by sender to his pager and the message will be displayed in the LCD.

State the need of modulation in communication system.

Description : State the need of modulation in communication system.

Last Answer : Need of modulation:- 1. To reduce the height of antenna 2. To avoids mixing of signals 3. To increases the range of communication 4. To make multiplexing of maximum signal is possible 5. To improve the quality of reception

Why solar system is preferred now a days ? Justify your answer.

Description : Why solar system is preferred now a days ? Justify your answer. 

Last Answer : Since availability of fossil fuels like coal are limited in future so there is more importance of solar power in the energy deficient because of following advantages of solar power Fuel is ... .  10. solar system technology are ideally suited to distributed applications ( Decentralized system)

Draw and explain integrated duration curve used in system operation.

Description : Draw and explain integrated duration curve used in system operation. 

Last Answer : Diagram of integrated duration curve used in system operation: Explanation:  Integrated duration curve is obtained from load duration curve. It is drawn in between load on Y-axis in KW/MW and the X- ... a particular time of a day can also be shown on a curve which is called as mass curve. 

Define measurement and state the significance of electrical measurement system.

Description : Define measurement and state the significance of electrical measurement system.

Last Answer : Measurement: Measurement is essentially a process in which magnitude of a quantity is determined in comparison with another similar quantity with significant units. OR The measurement of a given ... x) The measurement conforms the validity of hypothesis and also adds to its understanding.

State two advantages of digital system over analog system.

Description : State two advantages of digital system over analog system.

Last Answer : 1. They are less susceptible to noise. 2. The effect of fluctuation in the characteristic of the components, ageing of components etc. is very small in digital circuits. 3. Digital circuits have capability of memory which makes them suitable for computers. 4. More accurate.

What are the disadvantages of Open loop control system?

Description : What are the disadvantages of Open loop control system?

Last Answer : Open loop control system are less reliable. In open loop control system Optimization is not possible. Open loop control system are less accurate.

Draw block diagram of instrumentation system. State function.

Description : Draw block diagram of instrumentation system. State function.

Last Answer : Primary transducer: The sensor which comes in contact with the measurement medium to sense the quantity. Variable conversion element: the transducer which converts the sensor ... transmitted through suitable transmission medium to the operator or presented with the help of indicators.

State the functions of fuel system and exhaust system of a diesel power station.

Description : State the functions of fuel system and exhaust system of a diesel power station.

Last Answer : Fuel system: It supplies fuel to engine for combustion purpose. It consists of Fuel Pump: - It supplies fuel to engine for combustion purpose. Strainer: - Are provided to remove suspended impurities and ... most of the noise. Chimney:- To exhaust gases in the atmosphere as high as possible. 

Draw the block diagram of basic wind energy conversion system and write function of each block.

Description : Draw the block diagram of basic wind energy conversion system and write function of each block. 

Last Answer : Block diagram of basic wind energy conversion system: OR Components of wind power plant and their functions:  1) Rotor /Blade/Aero-turbine: Blade extracts significant power from the ... stronger and smoother. Towers are supports to raise the main part of the turbine up in the air.

Explain starting system in diesel electric power plant.

Description : Explain starting system in diesel electric power plant.

Last Answer : Starting system in Diesel Electric Power Plant: It includes Storage battery, compressed air tanks, self-starter etc. The purpose of engine starting system is to rotate the engine initially while ... as Ammeters, Voltmeters, Wattmeters, Thermometers, Pressure gauges, Visible and audible alarm etc.

Explain fuel system and air intake system in diesel electric power plant.

Description : Explain fuel system and air intake system in diesel electric power plant.

Last Answer : Fuel system and air intake system in diesel electric power plant :  Fuel system: It consists of storage tank, strainers, fuel transfer pump and all day fuel tank. The fuel oil is supplied ... Filters are provided to remove dust particles from air which may act as abrasive in the engine cylinder.

State any four advantages of interconnected system.

Description : State any four advantages of interconnected system.

Last Answer : Advantages of interconnected Systems: i) Reduced Overall installed Capacity: Inter connected power systems reduce the overall requirement of installed capacity for a given load area. With ... to interconnection, there is optimum utilization of available natural resources in the country.

State the functions of following elements: i) Diesel engine system ii) Air intake system iii) Engine exhaust system iv) Engine starting system.

Description : State the functions of following elements: i) Diesel engine system ii) Air intake system iii) Engine exhaust system iv) Engine starting system.

Last Answer : i) Diesel engine system:-  Four strokes Two strokes ii) Air intake system:- Air intake system is provided to supply air to engine cylinder for fuel combustion.  iii) Engine exhaust system ... provided to rotate the engine initially until the firing starts and engine run under its own power. 

What is the choice of size and number of generator units in interconnected power system?

Description : What is the choice of size and number of generator units in interconnected power system?

Last Answer : Choice of Size and Number of Generating Units: 1. The size/rating and number of generating units in such way that they approximately match with the load curve as closely as possible. 2. In ... , if power plant is connected to grid system then generating unit of higher capacity can be installed.

Explain significance and purpose of electrical measurement system.

Description : Explain significance and purpose of electrical measurement system.

Last Answer : ➢ Significance of Electrical Measurement System  1. The measurement is required for measurement of all physical quantities for e.g speed, velocity, temperature, pressure etc.  2. All electrical ... 4. These standards and references may changes time to time, area to area person to person 

The permissible voltage variation in transmission and distribution system is:

Description : The permissible voltage variation in transmission and distribution system is:  (A) ± 0.1% (B) ± 1% (C) ±10% (D) ± 25%

Last Answer : The permissible voltage variation in transmission and distribution system is: ±10%

Which of the following is the least expensive protection for over current in low voltage system?

Description : Which of the following is the least expensive protection for over current in low voltage system?  (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker

Last Answer : Which of the following is the least expensive protection for over current in low voltage system?  (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker

A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum

Description : A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is (A) 28.2 mm (B) 26.4 mm (C) 24.4 mm (D) 22.0 mm

Last Answer : A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is 22.0 mm

When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is

Description : When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is (A) 86.6% (B) 50% (C) 57.7% (D) 73.2%

Last Answer : When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is 73.2%

steady-state stability of a power system is improved by

Description : steady-state stability of a power system is improved by

Last Answer : steady-state stability of a power system is improved by using double circuit line instead of single circuit line

Power factor of the system is kept high?

Description : Power factor of the system is kept high?

Last Answer : Power factor of the system is kept high to reduce line losses, to maximise the utilization of the capacities of generators, lines and transformers, to reduce voltage regulation of the line.

write short notes on single phase system.

Description : write short notes on single phase system.

Last Answer : A "phase" in an electrical system is often referred to as the waveform (may be voltage or the current) of the power supply. The waveform in an AC system is typically ... domestic household or commercial supplies and street lighting. Industrial supplies requires three phase electrical supply .

What is Data Acquisition System (DAS) ?

Description : What is Data Acquisition System (DAS) ?

Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

Describe the use of Pneumatic system in daily life.

Description : Describe the use of Pneumatic system in daily life.

Last Answer : I. Automatic tyres are inflated with compressed air. II. Spray guns use compressed air for spraying paints. III. Compressed air is used in air powered tools like hammers and drills IV. It is also used in air brake system in heavy vehicles.

Write short note on UPS and its usage in railway system.

Description : Write short note on UPS and its usage in railway system.

Last Answer : Ans. Ideally, the voltage supply by the utility system should be perfect sine wave without any harmonics, at its nominal frequency of 50 Hz and at its nominal magnitude. In practice however voltage can ... load from one source to the other results in the least amount of disturbance seen by the load.

Septic System Design

Description : Septic System Design

Last Answer : Most people, when they get their own property, take all their time designing and building the house first and worry about the septic system later. For the most part it works out just fine, the house is built ... that it's a bad choice-it isn't-but it's practical to always go for the least expensive.

The Lymphatic System

Description : The Lymphatic System

Last Answer : An Overview of the Lymphatic System The lymphatic system refers to a type of network in the body that consists of the lymphoid organs, lymphatic tissues, lymph ducts, lymph nodes, lymph vessels and ... many ways in which the lymphatic system takes action in a lot of the human body's processes.

Septic System Maintenance

Description : Septic System Maintenance

Last Answer : Nobody is interested in thinking about what happens when someone forgets to clean his or her septic system in the backyard. We don't need to tell you either. Not draining and cleaning your septic ... its regular cleaning schedule you don't have to worry about the system breaking down anytime soon.

Septic System Cleaning

Description : Septic System Cleaning

Last Answer : A septic tank requires cleaning to remove the scum or solid wastes that have accumulated in it over the years. The modern septic system was designed to allow liquid waste to flow freely back out as ... from clogs and impurities? Remember, when the tank goes, the system goes. Take note of that.

How To Make A Sprinkler System

Description : How To Make A Sprinkler System

Last Answer : Watering plants can be quite tiresome, especially for huge gardens. You will have to walk through the maze of shrubs, blooms and rocks just to sprinkle every garden plant with water. Thanks to human ... 't join the show American Inventor with this invention; this writer would not be very happy.

How to Choose a Home Security System

Description : How to Choose a Home Security System

Last Answer : How to Choose a Home Security System Burglars can strike the moment your house is left alone or when everyone's asleep. Even if all the doors are locked, some of them can still enter using their ... protected upon the trigger of an alarm or a flick of a switch from the system's control panel.

How to Care for Your Immune System

Description : How to Care for Your Immune System

Last Answer : How to Care for Your Immune System Your immune system is important in keeping you healthy, helping you recover from disease and preventing disease from ever affecting you in the first place. The immune ... Live a good long life with a healthy and strong immune system. Remember: Health is wealth!

How To Boost Your Immune System

Description : How To Boost Your Immune System

Last Answer : How To Boost Your Immune System Your immune system is one of your body's most important parts. It protects you from having to succumb to every little illness that your body is in danger of ... defense against pathogens. Boost your immune system and Ensure that you will live a long and healthy life.

How to Install a Surround Sound System

Description : How to Install a Surround Sound System

Last Answer : How to Install a Surround Sound System The complete multimedia experience is in great part about the perfect execution of sound. While normal stereo speakers are great for watching TV or some movies, ... new surround sound system and enjoy every bit and beat for the best audio experience possible.

How to Install a Sprinkler System

Description : How to Install a Sprinkler System

Last Answer : How to Install a Sprinkler System A sprinkler system promotes convenience in the normally tedious job of watering your lawn or garden. Upon activation, the sprinklers provide water for the entire ... When everything is up and running, you can finally stop worrying about watering the plants.