This document discusses AM radio receivers. It begins by describing the basic functions of a radio receiver as selecting the desired signal, amplifying it, and demodulating it to recover the original signal. It then classifies receivers based on the type of traffic and lists AM and FM broadcast, TV, and radar receivers. It describes two types of AM receivers - TRF (tuned radio frequency) and superheterodyne. While TRF receivers are simple, superheterodyne receivers convert all radio frequencies to a lower intermediate frequency, addressing issues with TRF receivers like instability, poor audio quality, and bandwidth variation. Key components of a superheterodyne receiver are the RF amplifier, mixer, intermediate frequency amplifier, and AM
Wireless communications is a hot topic in technology today, driven by technologies like Wireless Networking, Cellular Telephony, Wireless Connectivity and Satellite Communications among others. Traditionally, wireless and RF communications has been one of the last bastions of analog engineering. With the advent of low cost digital, high speed integrated circuits, this too has become part of the digital domain. Although information transmitted today is largely digital high frequency signals whether digital or analog always behave like analog signals so having fundamental knowledge of this high frequency behavior is key.
Wireless communications is a hot topic in technology today, driven by technologies like Wireless Networking, Cellular Telephony, Wireless Connectivity and Satellite Communications among others. Traditionally, wireless and RF communications has been one of the last bastions of analog engineering. With the advent of low cost digital, high speed integrated circuits, this too has become part of the digital domain. Although information transmitted today is largely digital high frequency signals whether digital or analog always behave like analog signals so having fundamental knowledge of this high frequency behavior is key.
In radio and electronics, an antenna is an electrical device which converts electric power into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver. In transmission, a radio transmitter supplies an electric current oscillating at radio frequency to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves). In reception, an antenna intercepts some of the power of an electromagnetic wave in order to produce a tiny voltage at its terminals, that is applied to a receiver to be amplified.
Details: https://electronicsembeddedworld.blogspot.com/2018/06/performance-management-mcq.html
FM demodulation involves changing the frequency variations in a signal into amplitude variations at baseband, e.g. audio. There are several techniques and circuits that can be used each with its own advantages and disadvantages.
In any radio that is designed to receive frequency modulated signals there is some form of FM demodulator or detector. This circuit takes in frequency modulated RF signals and takes the modulation from the signal to output only the modulation that had been applied at the transmitter.
There are several types of FM detector / demodulator that can be used. Some types were more popular in the days when radios were made from discrete devices, but nowadays the PLL based detector and quadrature / coincidence detectors are the most widely used as they lend themselves to being incorporated into integrated circuits very easily...
RF Carrier oscillator
To generate the carrier signal.
Usually a crystal-controlled oscillator is used.
Buffer amplifier
Low gain, high input impedance linear amplifier.
To isolate the oscillator from the high power amplifiers.
Modulator : can use either emitter collector modulation
Intermediate and final power amplifiers (pull-push modulators)
Required with low-level transmitters to maintain symmetry in the AM envelope
Coupling network
Matches output impedance of the final amplifier to the transmission line/antenn
Applications are in low-power, low-capacity systems : wireless intercoms, remote control units, pagers and short-range walkie-talkie
Modulating signal is processed similarly as in low-level transmitter except for the addition of power amplifier
Power amplifier
To provide higher power modulating signal necessary to achieve 100% modulation (carrier power is maximum at the high-level modulation point).
Same circuit as low-level transmitter for carrier oscillator, buffer and driver but with addition of power amplifier
In communication system, intersymbol interference (ISI) is a form of distortion of a signal in which one symbol interferes with subsequent symbols. This is an unwanted phenomenon as the previous symbols have similar effect as noise, thus making the communication less reliable.
In communication system, the Nyquist ISI criterion describes the conditions which when satisfied by a communication channel (including responses of transmit and receive filters), result in no intersymbol interference(ISI). It provides a method for constructing band-limited functions to overcome the effects of intersymbol interference.
In radio and electronics, an antenna is an electrical device which converts electric power into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver. In transmission, a radio transmitter supplies an electric current oscillating at radio frequency to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves). In reception, an antenna intercepts some of the power of an electromagnetic wave in order to produce a tiny voltage at its terminals, that is applied to a receiver to be amplified.
Details: https://electronicsembeddedworld.blogspot.com/2018/06/performance-management-mcq.html
FM demodulation involves changing the frequency variations in a signal into amplitude variations at baseband, e.g. audio. There are several techniques and circuits that can be used each with its own advantages and disadvantages.
In any radio that is designed to receive frequency modulated signals there is some form of FM demodulator or detector. This circuit takes in frequency modulated RF signals and takes the modulation from the signal to output only the modulation that had been applied at the transmitter.
There are several types of FM detector / demodulator that can be used. Some types were more popular in the days when radios were made from discrete devices, but nowadays the PLL based detector and quadrature / coincidence detectors are the most widely used as they lend themselves to being incorporated into integrated circuits very easily...
RF Carrier oscillator
To generate the carrier signal.
Usually a crystal-controlled oscillator is used.
Buffer amplifier
Low gain, high input impedance linear amplifier.
To isolate the oscillator from the high power amplifiers.
Modulator : can use either emitter collector modulation
Intermediate and final power amplifiers (pull-push modulators)
Required with low-level transmitters to maintain symmetry in the AM envelope
Coupling network
Matches output impedance of the final amplifier to the transmission line/antenn
Applications are in low-power, low-capacity systems : wireless intercoms, remote control units, pagers and short-range walkie-talkie
Modulating signal is processed similarly as in low-level transmitter except for the addition of power amplifier
Power amplifier
To provide higher power modulating signal necessary to achieve 100% modulation (carrier power is maximum at the high-level modulation point).
Same circuit as low-level transmitter for carrier oscillator, buffer and driver but with addition of power amplifier
In communication system, intersymbol interference (ISI) is a form of distortion of a signal in which one symbol interferes with subsequent symbols. This is an unwanted phenomenon as the previous symbols have similar effect as noise, thus making the communication less reliable.
In communication system, the Nyquist ISI criterion describes the conditions which when satisfied by a communication channel (including responses of transmit and receive filters), result in no intersymbol interference(ISI). It provides a method for constructing band-limited functions to overcome the effects of intersymbol interference.
The presentation focuses on the components/concepts that build up any basic radio receiver. The presentation focuses on the concepts and characteristics of Receiving Antenna, LC or oscillatory circuits, rectifiers and Audio Amplifiers.
The following resources come from the 2009/10 BEng (Hons) in Digital Communications & Electronics (course number 2ELE0064) from the University of Hertfordshire. All the mini projects are designed as level two modules of the undergraduate programmes.
The objectives of this module are to investigate the following functions in a radio receiver for a communication system
• RF amplification
• Frequency conversion
• IF amplification and filtering
• Demodulation
This project involves working from a specification for the performance of a radio receiver and making laboratory measurements on various building blocks. These will be connected to form a complete receiver whose overall performance will be assessed using both test equipment and 'off air' signals.
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Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
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Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
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R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
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This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
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2. AM-RADIO RECEIVER
Radio receiver is an electronic equipment which
picks up the desired signal, reject the unwanted
signal and demodulate the carrier signal to get back
the original modulating signal.
3. Function of Radio-receiver
• Select desired signal and reject unwanted
signal
• Amplify the R.F. signal
• Demodulate the selected signal
4. Classification of radio receivers
Radio receivers are classified according to the
type of traffic they are designed to handle.
• A.M. broadcast receivers
• F.M. broadcast receivers
• T.V. receivers
• Radar receivers
5. Types of AM-Receiver
1.TRF-Receiver 2.Superhetrodyne AM-Receiver
TRF (Tuned Radio frequency) receiver
6. Drawbacks of TRF Receiver
• TRF receivers are simple to design and allow
the broadcast frequency 535 KHz to 1640 KHz.
But at the higher frequency, it produces
difficulty in design.
• Problem of instability.
• It has poor audio quality.
• B.W vary with tuning.
7. Super heterodyne Radio Receiver
A super heterodyne receiver converts all incoming radio frequency (RF) signals to a
lower frequency known as an intermediate frequency (IF).
10. Advantages of SHRR
No variation in bandwidth. It remains constant
over the entire frequency range.
High selectivity & sensitivity
High adjacent channel rejection
11. Receiver characteristics of the radio
1.Selectivity :
Radio receiver should have good selectivity and selectivity of
radio receiver is its ability to reject unwanted signals.
12. 2.Sensitivity
Ability to amplify weak signals. Broadcast receivers/ radio
receivers should have reasonably high sensitivity so that it
may have good response to the desired signal.
13. 3.Fidelity
The fidelity is the ability of receiver to reproduce all modulating
frequency equally.
1. Radio receiver should have high fidelity or accuracy without
introducing any distortion.
2. Eg. In an A.M. broadcast the maximum audio frequency is 5
KHz hence receiver with good fidelity must produce entire
frequency up to 5KHz.
14. 4.B.W.Improvement
To reduce the effect of thermal noise in the performance of
the receiver, it is necessary to reduce the B.W because noise is
proportional to square root of B.W.
Noise reduction ratio is achieved by reduction in B.W is known
as the B.W. improvement
B.W improv (B.I) =RF.B.W/IF.B.W
Noise figure improvement = 10Log10 B.I
15. 6.Insertion loss
• The insertion loss is the ratio of o/p power of filter
(Pout) to the i/p power (Pin) for signal freq.lying
within pass band of filter.
• Insertion loss (I.L) = 10Log10 (Pout/Pin)
7.Dynamic Range
Dynamic range is the I/P Power range over which the
receiver is useful.
It is in decibel. Highest range is about 100 dB
16. Advantages of RF-Amplifier
1.Greater gain i.e better sensitivity.
2.Improved signal to noise ratio.
3.Improved rejection of adjacent unwanted channel.i.e better
sensitivity.
4.Better coupling to antenna/Good impedance matching
17. 2.MIXER or FREQ.CHANGER
The mixer is basically a nonlinear device with two set of inputs at
different frequency & one set of o/p.
18. In square law mixer, square law device is used. as mixer.
It is device having squared relation between i/p & o/p.
Let two i/p applied to square law device are
Vi = V1Sinω1t & Vosc = V2Sin ω2t --------------------1
O/P of mixer is square of sum of two i/p .i.e
Vout = (Vi +Vosc )2 = Vi 2 +Vosc 2 +2 Vi.Vosc
Put the value of Vi & Vso in above eqn.
Vout = V1 2 Sin 2 ω1t + V2 2 Sin 2 ω2t +
2 V1V2Sinω1t . V2Sin ω2t .
We know
Sin 2ω1t =1-Cos2ω1t/2 &
2Sinω1t.Sin ω2t =Cos(ω2-ω1)t – Cos(ω2+ω1)t
19. Vout = V1 2[1-Cos2ω1t]/2 + V1V2[Cos(ω2-ω1)t – Cos(ω2+ω1)t +
V2 2[1-cos2ω2t]/2
Vout = V1 2 /2 - V1 2 Cos2ω1t/2 + V1V2Cos(ω2-ω1)t
- V1V2 Cos(ω2+ω1)t
+ V2 2 /2 - V2 2 Cos2ω2t/2----2
So mixer o/p is consist of SUM & Difference (ω2+ω1) & (ω2+ω1)
Frequency component. Thus square law device acts as Mixer.
20. IF & IF-Amplifiers
• Intermediate Frequency
– Sum or difference in the output of a mixer that enters the IF
stage.
• IF amplifiers
– One or more stage(s).
– Provide most gain and selectivity.
– IF is much lower than RF easier to design and good
sensitivity is easier to obtain with tuned circuit.
– IF amplifier will decide sensitivity, selectivity of the receiver.
Suitable IF range is 438-465 khz. with 455khz best.
21. AM DETECTOR/ENVELOPE DETECTOR
It produces an O/P signal that follows the envelope of the I/P
AM Signal exactly.
It is used in all commercial AM Radio receivers.
22. Automatic Gain Control
If the receiver gain is const. then receiver o/p will fluctuate
according to the strength of i/p signal.& this is not desirable .
AGC is used to adjust the receiver gain automatically so as to
keep the receiver O/P constant irrespective of the strength of
I/P Signal.