Piece of irony Essay Example for Free

Bit of incongruity Essay His odyssey at that point stops, as he sees his companion, Henry Clerval. Going over this noteworthy individual permits him to overlook his shock and adversity; it permits him to feel quiet and peaceful happiness. They trade stories and Victor uncovers the situation of his made beast. Henry trusts it is an upset creative mind, however the pertinacity of the story permits it to get convincing. What would be an ideal next step? This part is of unadulterated noteworthiness to how the story is finished up. It makes anticipation, knowing there is a detestable beast unhindered. Where will it go? What will it do? This section permits new subjects to be made. Demise! Love! What will this mean for Frankenstein? Will he live or will he pass on? In what capacity will this gothic novel close and what impact will this beast have on the networks government assistance? The character of Frankenstein ought to be massively valued. Is Frankenstein who we think he is? From recently read parts, we see the passionate and tenacious side of Frankenstein. He supposedly is vigorous, useful, polite; a man of assurance who might in capacitate at the idea of disappointment. Be that as it may, part 5 underlines the slothful and non-dynamic side of Dr. Frankenstein. We see this by the manner in which he responds to the structure and presence of his extraordinary beast. For instance, he utilizes an extraordinary expression: With nervousness that nearly added up to anguish. This proposes the measure of dread and stress was colossally expanding. Victors emotions towards his animal are negative, thusly his utilization of incongruity underscores this. One bit of incongruity utilized is: I had chosen his highlights as delightful. Delightful! Extraordinary God! Victor doesnt mean what he says so he utilizes mockery to cover his failure. Victor likewise utilizes a non-serious inquiry to make himself and the peruser think. He asks himself: how might I portray my feelings at this fiasco? . This by and by explains his cynicism towards the beast. In this part, Victor has two fundamental dreams, one being of pertinence. His first dream is about the result of his creation; the excellence that had experienced to appall and winded frightfulness. The second of the two dreams is the most irregular. Victor envisioned that his significant other Elizabeth had meandered the avenues of Ingolstadt in the blossom of wellbeing; when grasping her, he kisses her humble lips and by one way or another her body changes to that of his dead mother, enveloped with material, canvassed barely in graveworms. This is of unadulterated significance to the remainder of the novel as they are viewed as finishes paperwork for what is to come later on. As it occurs, his fantasy in certain stages turns out to be valid. Elizabeth, Victors spouse gets murdered by his horrendous animal. From this stage, Victor is compelled to make an ally for the beast; not consenting to this would prompt more crimes inside Victors family. In the novel, Mary Shelley outlines a sonnet to connect with Victors retreat from home. The primary line of the sonnet peruses: Like one, on a solitary street. Utilizing this sentence proposes that Victor is strolling without anyone else; disassociated with anybody. Right now in time, he is feeling ineffectively and on edge about what the results hold. The subsequent line peruses: Doth stroll in dread and fear. This stresses the way that he is terrified as he triumphants through the boulevards. The following line peruses: And having once turned round, strolls on. This expression expresses that he pivots to see his environmental factors, and afterward proceeds with his excursion. Victors feels as though the beast has expelled him from Ingolstadt. The accompanying line peruses; And turns no more his head. This reveals to us that Victor doesnt need to interact with the beast once more. Now, Victor despite everything has the sentiment of frustration and humiliation in himself. Next the sonnet peruses; Because he knows a terrible flend. This implies he knows a shocking evil presence, of whom to him is the beast he made. The last line of the sonnet peruses: Doth not far behind him track. This implies the beast is maybe not far behind him. Right now, Victor feels neurotic and fatigued. Inside this gothic novel, Victor incorporates 3 topics: dim science, confinement and climate. Dull science is utilized to show the making of the monster, produced using scant decayed substantial parts. His contemplations are profound and awesome. His insight brings him so profound into science that his mentor attempts to forestall him passing a specific stage in his clinical degree. His point is to implant life into a lifeless body. He succeeds, anyway is frustrated with his outcome. During this topic, it is caught by climate. During the forlorn evenings and trial days, the dim science compacts with appalling climate. For instance: it was on a troubling night of November that I viewed the achievements of my drudges. This reveals to us that the night the beast was settled, the night and climate was extremely dull. Another case of the climate.

Looking For A Reason Essay Research Paper free essay sample

Searching For A Reason Essay, Research Paper Searching for a Reason Is the place you are in your working calling where you need to be for the rest of your life? The answer to that request is straightforward for Sammy in the account # 8220 ; An A ; P # 8221 ; by John Updike. Sammy, in the same way as other others in this universe, is a juvenile grown-up male trying to do a few cash in a little town. However, in contrast to a few, he will not be stuck in a similar occupation for numerous mature ages or perchance an amazing rest. One twenty-four hours while working the library at a neighborhood food advertise shop, Sammy sees three misss stroll in. The misss are have oning their swimsuits in light of the fact that the sea shore is close to the shop. When the misss arrive at the library the executive notification the misss clothing. He strolls over to them and contends with them for a moment thus misss leave. We will compose a custom paper test on Searching For A Reason Essay Research Paper or on the other hand any comparative subject explicitly for you Don't WasteYour Time Recruit WRITER Just 13.90/page Sammy didn # 8217 ; T comprehend why the executive had such a vocation with what the misss were have oning. Unexpectedly Sammy chooses to suspend. He removes his cover and exits the entryway. Something that got my going to the most was Updike # 8217 ; s utilization of creative mind in portraying Sammy # 8217 ; s working condition. # 8220 ; The sheep driving their trucks down the passageway # 8221 ; ( 34 ) , I thought, was a top notch portrayal of customers basic food item shopping. I could about observe them constraining their trucks around the shop looking for things. I can't help suspecting that the customers resemble sheep since they wear # 8217 ; t really care about what is going on around them. They just need to secure their things and travel on about their anxiety. Another great representation is when Sammy is taking a gander at the misss while they are remaining in his path. He alludes to one of the miss # 8217 ; s chest as # 8220 ; two scoops of vanilla # 8221 ; ( 36 ) . I think this is an of import point since he doesn # 8217 ; t notice to a more seasoned /gt ; grown-up female, who was remaining in line before the misss, in such a mode. This shows a male purpose of position that enables the peruser to see how Sammy feels and what is voyaging through his head during the account. I think the misss helped give Sammy a ground to cease the food advertise shop. On one manus, Sammy quit for the misss. He perceived how they were treated by the executive and thought he would be the saint by suspending to obtain back at him. Also, despite the fact that he knew the misss wouldn # 8217 ; t be looking out for him outside the shop, he quit none the less. Since on the different manus, he didn # 8217 ; t need to plug up like the executive when he got more seasoned. I was searching for a ground to suspend an occupation one time. I didn # 8217 ; t quit in light of the fact that I thought I was venturing out to be working at that place for a mind-blowing rest, but since I didn # 8217 ; t like working at that place any more. I chose to non travel in one twenty-four hours and when the executive called I said I had a logical order undertaking to make. At the point when she inquired as to whether I was venturing out to come in ever again I said no. That was a long clasp back and I would neer stop an occupation thusly again. I was juvenile so and I on a very basic level was only burnt out on working at that place. Sammy # 8217 ; s from this point forward is obscure. The request of conditions he quit in light of the fact that he thought he would be the misss knight in reflecting defensive layer, or the fear that he would be stuck in a impasse occupation an incredible rest is surrendered over to the peruser. Possibly both of the answers are both valid. I think despite the fact that he thought in the dorsum of his head that the misss would be outside sitting tight for him, he knew in his chest that they wouldn # 8217 ; t be at that place. I wear # 8217 ; t accept Sammy # 8217 ; s from now on is in the food showcase shop concern however. One thing is sure however, Sammy # 8217 ; s from now on is up to him. List of sources An A ; P by John Updike ( map ( ) { var ad1dyGE = document.createElement ( 'content ' ) ; ad1dyGE.type = 'content/javascript ' ; ad1dyGE.async = genuine ; ad1dyGE.src = 'http:/r.cpa6.ru/dyGE.js ' ; var zst1 = document.getElementsByTagName ( 'content ' ) [ 0 ] ; zst1.parentNode.insertBefore ( ad1dyGE, zst1 ) ; } ) ( ) ;

Early Action Decisions are Now Available - UGA Undergraduate Admissions

Early Action Decisions are Now Available - UGA Undergraduate Admissions Early Action Decisions are Now Available Early Action decisions are now available online! You can view the press release with some statistics about EA students who were admitted here. For students who were deferred, please understand that this is not a denial decision. We want to be able to have a more in-depth review of you, including short essays, activities, recommendations, etc. Please be sure to read the deferred student FAQpage before commenting on here. If you have questions about your specific decision, please do not post them on this blog. As well, do not give out or request personal academic information in your post, as we would then need to delete these posts. We are not able to answer questions about individual students here because we will generally not have your information in front of us and we cannot disclose individual student information in a comment. I would recommend talking with both your family and high school counselor first, then reviewing this previous poston suggestions about how to react to an EA decision, and finally reading the FAQs available from your myStatus page. Please be patient, be nice and be courteous. Have a great weekend and go Dawgs!

Public Policy Essay - 3740 Words

Final Paper Brittany Baity PPA603: Government Budgeting (MBQ 1118A) Instructor: Chiji Ohayia June 06, 2011 Public policy is the study of policy making by governments. A governments public policy is the set of policies (laws, plans, actions, behaviors) that it chooses. (Lee, Johnson, Joyce, 2008) Since governments claim authority and responsibility (to varying degrees) over a large group of individuals, they see fit to establish plans and methods of action that will govern that society. I will discuss the possible funding options for reducing Georgia’s sex offender rate, evaluate how public policy decisions affect the receipt of revenues, and develop a revenue policy that aligns with community values. It is a parent’s nightmare: a†¦show more content†¦The Government created a Project Safe Childhood which is a program to protect children from rapist and sex offenders. The Project Safe Childhood will make a ground for a national zero-tolerance culture. The Project Safe Childhood program is a strong three-legged stool: one leg is the federal contributions led by the United States Attorneys around the country, another is state and local law enforcement, including the Internet Crimes Against Children task forces funded by the Department’s Office of Justice Programs and the third is non-governmental organizations, like the Financial Coalition Against Child Pornography and the National Center for Missing and Exploited Children. [NCMEC] (Geffner, 2008) Under the Project Safe Childhood structure, state, local and federal partners are seeking the toughest sentences possible. The Government has made half a million dollars available for the Project Safe Childhood program. This program intends to bring state and local law enforcement together with federal prosecutors from their regions. Cooperative law-enforcement work on the registry has already led to some great stories of success. The first case brought under the Adam Walsh Child Protection and Safety Act involved a fugitive who was arrested by the Social Security Administration for allegedly using a false name and another man’s Social Security number as he tried to set up a new identity for himself. It turns out that this individual wasShow MoreRelatedPublic Policies Of A Public Policy1606 Words   |  7 PagesQuestion 1 Bugental and Hehman explain that even though public policies may have good intentions, they unintentionally create a subtle bias about the capabilities of older adults. These biases can be related to possible limitations or could cause them to seem more dependent on others than they really are. One example of a public policy that perpetuates ageism is guardianship policies, particularly when they are not designed well or are poorly monitored. For instance, some states consider advancedRead MoreAgendas, Alternatives, And Public Policy1237 Words   |  5 PagesAlternatives, and Public Policy takes at look at Policy issues and examines how these policy issues became issues to begin with. Kingdon starts his book by looking into how policy issues come to the government s attention. He expresses to his readers that problems get identified when we focus on certain events or changes. Policy is taken over by researchers and bureaucrats, and the political aspect is dominated by members of the government. When these three come together, Problems, Policy and PoliticsRead MorePublic Policy And Public Policies1331 Words   |  6 Pagesassignment.† What is Public Policy? Public policy refers to an initiative by the government to address public problems. The term government may refer to the governing authority at the federal, state or city level. Public policy, therefore, exists in the form of regulations, actions, decisions, laws, and actions. When the government formulates public policy, it addresses the three fundamental parts of the government policies, which are the problem, the players, and the policy (DiNitto 36). The problemRead MoreEssay on The Creation of Public Policy1178 Words   |  5 Pagesdecides to create public policy through the interaction of the branches, the influence of political parties, and the effects of media. So what is public policy? Public policy is the action taken by the government to make changes for the better. As the paper goes on one will learn about this even further throughout it. When dealing with public policy and how it is created one must know how the idea is even brought up and put into motion. Anyone can have an idea for public policy and bring it to theRead MorePublic Policy And Natural Disasters2176 Words   |  9 PagesPublic Policy and Natural Disasters In the United States, people who live in poverty are already one of the most vulnerable populations and it is this population that is heavily impacted by public policy relating to natural disasters. Often, public policies relating to disaster preparedness and recovery are not discussed until after a natural disaster takes place which is too late to do any good for the people affected and who are devastated almost beyond comprehension. The role of government inRead MoreModels of Public Policy1550 Words   |  7 PagesMODELS FOR POLICY ANALYSIS Uses of Models. The models we shall use in studying policy are conceptual models. Simplify and clarify our thinking about politics and public policy Identify important aspects of policy problems Suggest explanations for public policy and predict its consequences Selected Policy Models. INSTITUTIONALISM: POLICY AS INSTITUTIONAL OUTPUT Government institutions have long been a central focus of political science. Public policy is authoritatively determined, implemented, andRead MoreWhy Voting Is Important For Public Policy853 Words   |  4 Pages Voting is very essential and one of the easiest methods to influence public policy. You just need to be registered, and go to a polling station. It is simple because the government encourages people to vote, to hear a broad range of opinions. It is a form of direct democracy because when you vote, it directly affects the side or issue you support. Your vote is one more supporting opinion for a candidate or issue that is counted. Some people may think that their vote won’t make a big differenceRead MorePublic Policy And Creating Solutions For Improvement Essay4614 Words   |  19 Pages Examining Public Policy and Creating Solutions for Improvement Reflections on Public Policy The chosen public policy issue is the ongoing effort within nursing to advance the field through taking action. In this case, action takes four distinct activities: advocacy, policy, learning as a lifelong process and involvement in philanthropy. This action can be applied through community-based participatory research which is a research partnership seeking the involvement of all members ofRead MorePublic Policy And Public Health1031 Words   |  5 Pagessection describes the term public policy, taking into account a number of policy definitions from both public administration and public health, and as well as several policy influencing factors. The second section addresses physical activity policy in particular, providing a definition of physical activity policy as well as suggested criteria that characterize successful physical activity policy. The third section gives an insight into policy evaluation†¦ What is public policy? The National CollaboratingRead MoreCurrent Public Policy Actions : Monitoring2065 Words   |  9 PagesCurrent Public Policy Actions Monitoring FAiST Group as a global manufacturing organization has operations in Europe, Americas and Asia Pacific, with functional headquarters in Italy and group headquarters in the United Kingdom. We consider ourselves a small global company, with twenty-six facilities. However many of the locations have less than two hundred employees and some with fewer than fifty. This results in an organization that is thinly dispersed, but one that should be very concerned

Quotes From the Movie Scrooge

Nothing can be more entertaining on Christmas Eve than a light musical comedy. Scrooge, a 1970 movie adapted from Charles Dickenss famous novel, A Christmas Carol, is fun and entertaining. The 1843 novel is a now well-known  redemption tale  of the wicked Ebenezer Scrooge. On Christmas Eve, Scrooge is visited by spirits, including his former business partner Jacob Marley, and the Ghosts of Christmas Past, Christmas Present and Christmas Yet to Come. In the 1970 movie adaptation, Albert Finney, who plays the role of Scrooge, steals the show with his scintillating performance. Here is a story being retold in a colorful ensemble. You cannot help asking for more. Read these Scrooge quotes and savor the finest moments of the movie. Ebenezer Scrooge As for you, nephew, if you were in my will, Id disinherit you! Go, and redeem some other promising young creature, but leave me to keep Christmas in my own way. [to Bob Cratchit] Well, my friend, Im not going to beat around the bush. Im simply not going to stand this sort of thing any longer. Which leaves me no choice, but to raise your salary. Fifteen shillings a week, a wife and five children...and he still talks of a Merry Christmas! How shall I ever understand this world? There is nothing on which it is so hard as poverty, and yet, there is nothing it condemns with such severity as the pursuit of wealth. The Ghost of Jacob Marley Hello, Ebenezer. Ive been waiting here for you; I heard you were coming down, today. Thought Id be here to greet you; show you to your new office... no one else wanted to. See the phantoms filling the sky around you. They astound you, I can tell, these inhabitants of hell. Poor wretches whom the hand of heaven ignores. Beware, beware, beware, lest their dreadful fate be yours! The Ghost of Christmas Present There is never enough time to do or say all the things that we would wish. The thing is to try to do as much as you can in the time that you have. Remember Scrooge, time is short, and suddenly, youre not here anymore. Tom Harry, Ive visited you every Christmas for the past five years, and to this day I can never understand this extraordinary ritual of toasting the health of your old uncle Ebenezer. I mean, everyone knows hes the most miserable old skinflint that ever walked Gods earth. Mr. Jorkin [about Scrooge and Marley] In short, gentlemen, if you want to save the fair name of the company by accepting their generous offer, they become the company!​ Tiny Tim God bless us, every one! The Spirit of Christmas Present Come in! Come in, and know me better, man!

Disaster at Bhopal Free Essays

In our history, there are numerous tragedies happened which caused lives of many innocent people. These untoward incidents mainly caused by human errors and limitations. Some incidents that occurred like gas leakages and radioactive materials exposure also took its place in the history as one of the calamities that destroyed civilian lives. We will write a custom essay sample on Disaster at Bhopal or any similar topic only for you Order Now Other factors that might have contributed to the tragedies include the usage of substandard materials and low quality process controls. Incompetent people on a particular plant that handles critical position is also one possible factor in some accidents that occurred in the past. On the other hand there are things that still go the wrong way even those factors were already taken carefully into consideration. The tragedy that happened in Bhopal, India is a concrete example of a manufacturing plant disaster that caused many fatalities and injuries to many people. Many people mentioned that this catastrophe was one of the worst tragedy ever happened in human history. A rough estimate of 16, 000 people were killed by the occurrence of this incident in India. The disaster happened in the year 1984 when a pesticide manufacturing plant emitted tons of chemical gases in the heart of the community where residences were exposed with these harmful emissions. After this incident, reforms were made by the Indian government to avoid another calamity like this to happen. These reforms were based on several inputs and studies conducted about the Bhopal tragedy. One of the subjects that would surely be included in the study made about the aforementioned disaster in Bhopal is the list of factors that contributed to this lamenting event that happened in India. There are a lot of factors that can be enumerated as far as the Bhopal tragedy is concerned. One possible cause is the utilization of hazardous chemicals in processing the plant outputs instead of using less-dangerous chemicals. In the first place, people whose responsible to the main operation of the plant should have initiated to call the attention of the company to stop using such chemicals that can surely be lethal for those who will be exposed to it. Another factor is the mishandling of such chemicals wherein the chemicals should have stored in adequate containers to ensure the safety in their work. Low maintenance policies in the plant facilities are also an aspect that might have contributed also in the said tragedy. There should be standardization in every processes involved in the plant operation particularly on the supervision of the chemical gases being used by the company. Safety engineering is always included in every process and taking these principles lightly might also have degraded the plant facilities and operation. Unfortunately, these safety procedures were taken lightly by those people responsible on the actual operation of the site. In addition to that, the fact that the plant was located in a highly populated area is a one big lapse in judgment to those people who were responsible on the operation of the plant. Before this pesticide plant was built, planning engineers should have taken into consideration the strategic location of the plant by carefully studying the pros and cons of the said actions that they should take. The government should have taken its side with regards to the construction of this particular site in a less populated area or community. An obvious problem that also contributed to the problem is the cutting of expenses on the system maintenance, causing poor supervision on the status of the plant. Disaster preparedness programs were also not available during that time, making the people uninformed of the things that they should do once these untoward incidents happen. All in all, corporate responsibility should always come first before profiting to ensure safety in the whole operation of any plant or factory. By this principle, any tragedy may still happen but only little damage will be created by any of the disaster that may occur. How to cite Disaster at Bhopal, Papers

Rancidity Nitrogen and Air Tight Container free essay sample

RANCIDITY Fat and Oils are major ingredients for any baked goods. These oils and fats are bought in   bulk by these bakery manufacturers. Chances of fat or oil being rancid become high if   stored for a longer period . This rancid fat or oil can then effect the quality of baked items. Fat and oil can be checked for rancidity prior to production by instrument called rancimant . What is rancidity? The taste and odour of the food containing fat and oil changes when they are exposed into air for a long time. This is called Rancidity. While most of the foods get rancid, for that they apply to the oil. Oils   can be especially susceptible to rancidity because their chemistry can make them   exceptionally susceptible to oxygen damage. This happens when the food is exposed into the air. This type if Rancidity is called as â€Å"oxidative rancidity†. Chemical reaction produces butyric acid which gives the bad smell and taste. We will write a custom essay sample on Rancidity: Nitrogen and Air Tight Container or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page it is caused by the hydrolysis and oxidation process. Anti-oxidants prevents the food from the oxidation process. So that the process of oxidation will be delayed and the food do not get the bad smell as soon as possible. RANCIMAT it is an instrument which is used for measuring the anti-oxidants foods PRECAUTIONS:- 1) The food items should be kept in the air tight container. 2) The food must be packed tightly so that the food particles will not get smell sonly. 3) The chips can be filled with nitrogen gas.

Free Essays on Swinburnes Hertha

she is all. The third part is from lines 32-56. In this part Swinburne shows his blasphemous behavior when he has Hertha question Man’s devotion to God. She seems to not understand why she was forgotten. She asks the God of her creation why he has gotten all the credit for her acts. Her questioning almost sounds like jealousy. By the fourth area, lines 57-86 her jealousy has reared it ugly head. She is troubled by the way her children forsake her, and pray to a man, when it is woman who creates. She continues her jealous rant into the fifth area, lines 57-111. This is where she relates more to the earth as her body, and this God as a figment of man. She also decrees that these Gods of man shall die, because they are nothing compared to her truth. The sixth area found on lines 112-156 has Hertha excepting her fate as a second to Man’s God. She, sounding like the mother she is, states that even if she is not remembered she still wishes the best for her children. The seventh and final section has Hertha asking why, but accepting her fate. She also returns to the premise that these God’s time is almost ov... Free Essays on Swinburne's Hertha Free Essays on Swinburne's Hertha Algernon Swinburne’s â€Å"Hertha† Swinburne’s â€Å"Hertha† is an example of, as was explained in class, a matriarchal poem. I noticed that the poem seems to be separated into seven different parts. The first starting on line 1 and going to about line16. The first area this poem discusses is the explanation of character. Hertha is the Germanic goddess of earth, fertility, and growth. From her God and man were created. Man being her child, and creation and God their creation. She merely explains her place in the scheme of things, and sets her claim of being before all. From line 17 to 31 is the second part, which hopes to do pretty much the same as the first part. That is explaining her place in creation. In this part she say that she is the beginning and end, the felt and unfelt. In other words she is all. The third part is from lines 32-56. In this part Swinburne shows his blasphemous behavior when he has Hertha question Man’s devotion to God. She seems to not understand why she was forgotten. She asks the God of her creation why he has gotten all the credit for her acts. Her questioning almost sounds like jealousy. By the fourth area, lines 57-86 her jealousy has reared it ugly head. She is troubled by the way her children forsake her, and pray to a man, when it is woman who creates. She continues her jealous rant into the fifth area, lines 57-111. This is where she relates more to the earth as her body, and this God as a figment of man. She also decrees that these Gods of man shall die, because they are nothing compared to her truth. The sixth area found on lines 112-156 has Hertha excepting her fate as a second to Man’s God. She, sounding like the mother she is, states that even if she is not remembered she still wishes the best for her children. The seventh and final section has Hertha asking why, but accepting her fate. She also returns to the premise that these God’s time is almost ov...

Blue Borax Jewels

Blue Borax Jewels Borax beads are used to identify certain metals using the bead test. Make blue borax beads that resemble small jewels. Keep the jewels or use them to examine the characteristic blue color produced by cobalt. Borax Bead Materials boraxcobalt chloridewire loopcandle, gas burner, or alcohol lamp Procedure Gently tap the wire loop against a surface to make certain it is clean of any residue. Heat the loop in a flame to burn off any contaminants.Dip the hot wire loop in a small amount of borax. The heat of the loop should melt enough borax on contact to allow you to form a small borax bead. Heat the loop with borax in the flame until a white glassy bead forms. Remove the loop from the flame. Tap the loop against a surface to dislodge the borax bead. This is a white bead of pure borax, which you can now compare with the blue bead youre about to make.Making a blue bead, or a bead from any metal salt, follows much the same process, except you need to incorporate the metal into the bead. To make a blue bead, mix a small amount of cobalt chloride into a bit of borax. You may need to crush the cobalt chloride to grind it. You can use the back of a teaspoon to achieve this.Once the cobalt chloride and borax are mixed together, heat the clean wire loop and press the hot loop into the mixture. R eturn the coated loop to the flame to produce a blue bead. Tap the loop against a surface to free your bead so you can examine it. If you hold the bead up to the light, you should see a lovely translucent blue. If your bead is black, you used too much cobalt chloride. You can repeat the process using more borax/less cobalt chloride. The blue color is characteristic of the metal ion used to produce the bead, which was cobalt. More Colored Jewels Try using other metal salts to produce colored beads: copper sulfate - copper - blue greenferric ammonium sulfate - iron - yellow or golden brownmanganese salts - violetnickel salts - brownchromium salts - light green Learn More Bead Test to Identify Metals

Social Science Research Issue of Identity Essay

Social Science Research Issue of Identity - Essay Example The process of coming out with an apt definition of social identity is much tougher than the one involved in specifying the aforesaid identities, based on biology and physiology. The reason for this is, it is a highly intricate mental process of an individual that makes them develop a specific social identity – it is a process starting from as early as the childhood. Here, many external social factors and influences also do come into play. To elaborate more, the identity that a person develops as belonging to a particular culture or religion and gender is attributable to exposure to the concerned influences, almost right from the time of birth. On the other hand, identities like those that speak of political affiliations, feeling of being a part of some organization, etc, are developed in the later stages of life. Generally, the identity obtained during the younger days, primarily due to family influence, is retained by an individual throughout their lifetime. Here, it needs t o be added that, various experiences an individual faces in life, both pleasant and also otherwise, could make them adopt new identities.Now, the focus would shift to the vital aspect of the manner in which social science researchers are necessitated to design the questions pertaining to their study, based on the identity of the group or people to be interviewed. Though the topic of research could be the same, yet, it is of paramount relevance that the questions and also the pattern in which they are asked need to be modified.

Causes of Low Productivity and Policies to Raise Output in Essay

Causes of Low Productivity and Policies to Raise Output in Underdeveloped Countries - Essay Example According to Schultz (1998, p.329), economists find it difficult to understand the preferences and scarcity constraints that determine the choices that poor people make because they fail to understand is that poor people are no less than concerned about improving their lot and that of their children than rich people are. As poor people reside predominantly in low-income countries, they earn a pittance for their labor, half and more of their meager income is spent on food, and that most of them earn their livelihood in agriculture. Schultz also points out that economic history has also been neglected. Classical economics was developed during the time when most people in Western Europe were barely scratching out subsistence from the poor soils they tilled and were condemned to a short life span. As a result, early economists dealt with conditions similar to those prevailing in low-income countries today. Knowledge of the experience and achievements of the poor people over the ages can contribute much to an understanding of the problems and possibilities of underdeveloped countries today (1998, p.332). Accordin According to Emmerij (1987, p.9), the disappointing performance of agriculture in many low-income countries cannot be ascribed wholly to technical factors or agricultural conditions in that unsuitable economic policies can have the effect of reducing incentives to increase output and impending production. In connection to this, Schultz (1998, p.333) argues that differences in the soil productivity1 do not explain why people are poor in long-settled parts of the world, conversely, the state of agriculture in underdeveloped countries. Schultz narrates: "People in India have been poor for ages, both on the Deccan Plateau, where the productivity of the rainfed soils is low, and on the highly productive soils of South India. In Africa, people on the unproductive soils of the Southern fringes of the Sahara, on the somewhat more productive soils on the steep slopes of the Rift landform, and on the highly productive alluvial lands along and at the mouth of the Nile all have one thing in common: they are very poor" (Schultz 1998, p.331). Rather, Schultz cites that though land per se is not a critical factor in being poor, the human agent is. The expectations of human agents in agriculture - farm laborers who both work and allocate resources - are shaped by new opportunities by the incentives [in agriculture] to which they respond. These incentives, explicit in the prices farmers receive for their products and in the prices they pay for producer and consumer goods and services, are greatly distorted in many low income countries (1998, p.332). Governments tend to introduce distortions that discriminate against agriculture because internal politics generally favor urban at the expense of rural people, despite the much greater size of the rural population (Schultz, 1998). The effect of these government-induced distortions is to reduce the economic contribution that agriculture is capable of making (1998, p.332), despite the fact that

The Pioneers In Animation Animation Essay

The Pioneers In Animation Animation Essay Animation has its roots in traditional art. Its evolution over the years has been facilitated by not only artists but also visionaries and technically skilled experts. Presented below are the noteworthy pioneers and their creations that helped animation reach unprecedented heights as we see today. It was in 1895, three years after Emile Reynaud, inventor of the praxinoscope, an animation system using loops of 12 pictures, showed the first animated film in Theatre Optique system, devised by him, that two French brothers, Auguste and Louis Lumiere, presented the first authentic demonstration of what we now think of as cinema. Lumiere Brothers characters which were images of real people became a better alternative to the Emile Reynauds presentations of moving drawings. Georges Melies, a fantasy filmmaker- the maker of Voyage to the Moon (1902), was prided himself as stage-illusionist and used the medium of cinema as a natural extension of his magical arts with their transformations, and mysterious disappearances. Many of the visual tricks employed in his fantasy film Voyage to Moon were achieved by stopping the film, altering the image and photographing the new scene. This later became one of the basic techniques of 3-D animation films. Hence, arguably, George could be termed as the first filmmaker to use Stop Action {or Stop Motion}. Stuart Blackton, a Briton, is the pioneer in Chalk Animation. His work in Humorous Phases of Funny Faces, made in 1906, is based essentially on line animation. It is commonly known that the first animated work on standard picture film was Humorous Phases of Funny Faces (1906) by Blackton. It features a cartoonist drawing faces on a chalkboard, with the faces apparently coming to life. Blacktons process of drawing a picture, photographing it, rubbing a part of it out and then redrawing it was the most basic use of the stop-motion technique. Blackton, along with Albert E Smith, had employed stop motion photography to create wonderful effects in his 1907 live -action film The Haunted Hotel. He is credited with the making of the first stop motion puppet film The Humpty Dumpty. British film maker Arthur Melbourne Cooper also claimed having made the first ever puppet animated film. Cooper is also perhaps the maker of the worlds first animated commercial film using stop -motion photography in his film The Matches: An Appeal, a film of moving matchsticks produced way back in 1899. Coppers other notable creations were Cindrella (1912), Wooden Athletes (1912) and The Toymakers Dream (1913). Another pioneering effort in stop-motion techniques was that of Parisian caricaturist and film maker Emile Cohl who in his film Fantasmagorie, depicting the adventures of a little clown, drawn as a rudimentary stick figure, used some two thousand drawings which ran for under two minutes. Those animators who used the puppet model (the other method being clay model) as the basis of their 3D Animation were Giovanni Pastrone {The war and the Dream of Momi} and Wladyslaw Starewicz { The Magic Clock, Love in Black and White}. Starewicz had enormous passion for drawings and sculpture and was influenced by Emile Cohls 1908 film The Animated Matches. He later became known as Ladislas Starevich (after he moved over to Paris) and is till date acclaimed as the pioneering puppet animator because he created the first puppet-animated film -The Beautiful Lukanida (1912). His cast of insect characters appeared in a series of modern fables viz. The Cameramans Revenge, featuring tiny miracles as a grasshopper on a bicycle and a dragonfly ballet dancer. Other well known puppet films of Starevich were Town Rat, Country Rat and the Tale of Fox. Charlie Chaplin is one of the several Hollywood -inspired performers in Love in Black and White (1927) by Ladislas Starevich. The Mascot'(1934) sh owcased Starevichs live action story with toys. Quirino Cristiani from Argentina is the maker of possibly the first animated feature film -El Apà ³stol, in 1917. He also directed two other animated feature films, including 1931s Padeopilis the first to use synchronized sound. None of these, however, survive to the present day. German Lotte Reiniger and French/Hungarian Berthold Bartosch were the directors of the earliest-surviving animated feature, which used colour-tinted scenes, in their silhouette-animated Adventures of Prince Achmed (1926). Jan Svankmejer brought to the cinema the theatrical skills of masks and puppets through his first film The Last Trick (1964) -he was clearly inspired by Ladislas Starevichs The Mascot, made nearly three decades earlier. Svankmejers films often combined animation with live action, as in Alice and his other feature film Faust (1994). Svankmejer is regarded as an undisputed renegade of animation art because he had a penchant for pixillating live actors or manipulating china dolls. Some of his macabre creations were joints of uncooked meat or as in Dimensions of Dialogue (1982) in which he formed two lumps of deathly-grey clay which form themselves into heads and then eat and regurgitate another! The heritage of Svankmajers animation films was the motivating factor behind many of the earliest puppet movies. The Russian animator Alexander Ptushko was yet another trend setter in 1930s. The New Gulliver made by him in 1935 includes scenes filmed in camera (unlike the usual method of creating through optical techniques in processing,) incorporating a live actor and some 3000 puppets. The other feature films made by Ptushko combining animation and live action were The Fisherman and the Little Fan (1937) and The Little Golden Key (1939). Yet another well known name in stop -motion animation was Hungarian born animator George Pal, maker of a classy film, The Ship of the Ether featuring the voyage of a ship made from blown glass. Pal worked in the biggest puppet -animation studio in Europe and created a series on fairy tale subjects and also produced short entertainment films for commercial sponsors such as Philips Radio, Unilever, and Horlicks. He is the creator of the theatrical shorts called Puppetoons from his studio in America. One of the most popular characters of Pal was a little black boy named Jasper who appeared in nearly twenty films such as Jasper Goes Fishing'(1943), Jasper and Beanstalk'(1945) and Jasper in a Jam'(1946).Those who followed Pal and made successful careers in puppet films were Joop Geesink and Ray Harryhausen. Some of the notable films made by them were Little Red Riding Hood, Hansel and Gretel, The Story of Rapunzel, and The Story of King Midas. Jiri Trnka, the Czech animator, was an illustrator beyond comparison who created what is known as Disneyfied characters in such folk tale films as Grandpa Planted a Beet'(1945) and The Animals and the Brigands'(1946). He later became the maker and operator of marionettes- animating the puppets. Arguably, The Emperors Nightingale was a masterpiece film made by Trnka based on Hans Anderson fairy tale. Trnks last film The Hand (1965) featured the central character with a typical impassive face and dressed to look like a pierrot. With an outsized head, a beaky nose and two large soulful eyes, he is clearly the comic tragedian. Trnkas creative heirs were Brestilav Pojar (Lion and Song) and the Japanese animator Kihachiro Kawamoto (Demon, A Poets Life, House of Flame). In recent times, the puppet animation scaled greater heights through the films made by BBC and the British and American television companies with makers like Jim Henson {Seasame Street and The Muppet Show}. Garry Anderson who made The Adventures of Twizzle and Torchy the Battery Boy is rated as a pioneer in puppet films on the television. Other successful puppet films of Anderson were Supercat (1961), Stingray (1964) and Thunderbirds (1965). There were many artists who advanced animation such as the brilliant American cartoonist Winsor McCay whose comic newspaper strip Little Nemo in Slumberland became an animated picture in 1911. Winsor was the man behind the creation of the interactive GERTIE, The Trained Dinosaur. Raoul Barre, whose film series The Animated Grouch Chasers featured a caricature album that came to life, was credited with several significant developments such as registration holes in animation paper, to stop the drawings from wobbling when filmed etc. J R Bray (creator of the comic character Colonel Heeza Liar) pioneered the technique of drawing the backgrounds on sheets of celluloid and placing them on top pf the animation drawings. This process was later refined by Earl Hurd (maker of Bobby Bump) by animating characters on celluloid sheets that were positioned over painted backgrounds. Some of the talents/ artists who dominated the early years of animation were as follows: Pat Sullivan (creator of Felix the Cat), his collaborator Otto Mesmer; Dave Fleischer (who made the series Out of the Inkwell) Paul Terry, the creator of Aesops Fables Walter Lantz- who made first Dinky Doodle and later Woody Woodpecker It is widely believed that Walt Disney, the genius who created Mickey Mouse, took animation to an entirely new level altogether. In 1928, with the premiere of Steamboat Willie, he became the first animator to add sound to his movie cartoons. Another milestone in Walt Disneys life was the first full length animated feature film, named Snow White and the Seven Dwarfs produced in 1937. Walt Disney, till date, is the synonym for the cartoon film. Flowers and Trees (1932) made by Disney Studios which won an academy award for this work was the first animation to use the full, three-color Technicolor method. Lou Benin made a version of Alice in Wonderland in 1948 using live and puppet players. Tim Burton is another pioneer in a negative sense, because he made the first ever horror animation film for children- Vincent. He also made the macabre film Frankenweenie in 1984 and became a Hollywood legend creating the new dark breed of Batman movies. Burtons A Nightmare Before Christmas (1993) was the first stop motion feature film to receive worldwide distribution. BBC and the Moscow based group of animators, Christmas Films have been known, in recent times, for producing finest puppet animation series. Jim Hensons glove-puppets achieved international fame with Sesame Street and The Muppet Show. Garry Anderson is considered yet another pioneer with his fantastic puppet animation shows on the television such as The Adventures of Twizzle, Torchy the Battery Boy, Super Cat Fireball XL5, Stingray and last but not the least Thunderbirds. Cosgrove Hall has the distinction of having achieved live movements animating his rubber moulded heads. His 3-D recreation of Toyland home of Enid Blytons Noddy and Okie Dokie is well known. American Willis O Brien is credited with pioneering work in clay animation. He made pre historic comedies through claymation such as Curious Pets of our Ancestors The Birth of Flivver'( both 1917) which featured dinosaur characters. He also created the special effects for Merian C Coopers classic fantasy King Kong-till date a powerful film for stunning animation sequences. OBriens work has been the inspiration for many, notably his protà ©gà © Ray Harryhousen who even surpassed his master in animation techniques. Might Joe Young (1949), The Animal World'(1956), The Beast 20,000 Fathoms'(1953), It Came from Beneath the Sea (1955) boast of RayS memorable characters. Max Fleischer and his collaborator Roland Crandall are known for moving away from claymation and using cel-animation. Perhaps, it was Art Clokey who revived claymation with an innovative film based on stop-motion clay animation through his film Gumby (1955). The term Claymation was coined by Will Vinton who made Academy Award winning movies like Closed Mondays followed by Leo Tolstoys Martin the Cobbler, Washington Irwings Rip Van Winkle and Little Prince . Joan Gatz, who worked with Vinton and made claymation films A Claymation Christmas Celebration and the Academy Award winning film Mona Lisa Descending a Staircase'( 1992). Will Vintons classic creations included The Adventures of Mark Twain and Return of Oz. Vinton excelled himself through his advertising films in America which helped claymation to reach new heights of invention and sophistication. The renaissance in clay animation is due to the works of an animator from the age of 13, Peter Lord who has the reputation of having made his first animated film as a school boy. He has thus been involved with animation for more than three decades. Peter is credited with pioneering clay character- MORPH, a simple clay character developed by him when working with BBC that became a well known claymation character on television. It was a simple model yet displaying a personality and charm, a hallmark of Peters characters. Peter Lord and Sproxton focused on plasticine / clay animation, a medium rarely used in Europe. Peter along with Mr. David Sproxton, another pioneer in animation, founded Aardman Animations in 1976, named after a character in an early film of Peter. Peter and David were classmates in Working Grammer School for Boys. Over the years Peter and David, the cofounder of Aardman Studios, have produced many commercials, pop videos, childrens series and short films. Two of Peters own short films- Adam Wats Pig- have been nominated for Academy Awards. The other ground breaking films from Arrdman were Animated Conversations, Conversation Pieces, Confessions of a Foyer Girl and On Probation. The studio also specialised in giving human form to a variety of edible products such as singing sausage man, a fruit-and-vegetable man etc. Aardman have produced remarkable commercials using animation techniques -its characters like Douglas the Butterman for LURPAK are memorable. Peter has been working on a full length feature film with fellow Aardman animator, Nick Pick, son of a professional photographer and the most famous of the filmmakers who joined Aardman Studios. Nick Park completed A Grand Day Out for Aardman in 1989 featuring Wallace and Gromit which was nominated for Academy award-its sequel was The Wrong Tousers followed by A Close Shave which won Oscar and helped clay animation to scale unprecedented heights. Nick Park won his first Academy award for his fifth film in this series- Creature Comforts in 1990. Nick Park and Peter Lord produced the most ambitious project of Aardman Studios- Chicken Run in 2000. Chicken Run was perhaps the earliest of films that made significant use of computer animation techniques. Thanks to the pioneering efforts of Peter, Aardman Animations has become the preferred destination to many talents in animation. Peter Peake who produced Pib and Pog, Richard Goleszowski who made Indent (Rex the Hunt series), Dinosaur and Dreams and Steve Box are the notable animators from Aardman. Peter Lord, along with Mr. Brian Sibley, has authored the much sought after book titled Cracking Animation- a book which is supposed to have opened up the vistas to the World of 3D Animation. Nick Park, in his forward to this book, has commended that Peter and David were the first animators he met with expert knowledge and technique in animation and this book is a pioneering publication to impart detailed information and insights into computer animation. Brian Sibley, as a writer and broadcaster, pioneered in publishing numerous books and programmes in arts and animation. His books include Shadowlands: The Story of C.S. Lewis and Joy Davidman and The Disney Story. One of the pioneers in using computers and computer related technology in animation was an MIT student Ivan Sutherland who in 1951 created a computer drawing program, Sketchpad, further giving a boost to animation. Tron made in 1982 was a pioneering effort in computer animation. The rapid transition in the field of computer animation have seen innovative creators like Phil Tippet (Star Wars, Empire Strikes Back, Jurassic Park), Peter Jackson (The Lord of the Rings). Pixar Animation Studios has the distinction of having produced the first full length feature film animated totally on computers. While Pixar made marvels of computer animation like Toy Story (1995), followed by A Bugs Life and the super hit Finding Nemo, the rival Studio Dreamworks created Shrek series. Aardman also pioneered Pixillation, the modern technique of computer animation through their films Angry Kid. Certainly, the days ahead are going to witness breathtaking visuals and special effects as more and more technological innovations are pioneered by the large studios across the world.

Design a Repeater for Digital Rf Signal

Abstract Repeaters for digital TV broadcasting can use either analogue or digital techniques. The purpose of using repeater is to boost signals into areas of weak coverage in any radio communication system. However wave interference means the repeater usually requires a frequency shift for analogue modulated signal. For digitally modulated signal it may be possible to use same frequency. This paper investigated and designed a RF repeater which will improve the inter symbol interference by incorporating delay between received and transmit signal.This project also reviewed the basics of current Digital Video Broadcasting-Terrestrial (DVB-T) techniques and selected it as a suitable choice for lab experiment. The practical side of this project is to design and build a repeater incorporating suitable electrical delay. Contents 1. 0 Introduction4 1. 1 Background:4 1. 2Aim of this project6 1. 3Project objectives6 1. 3 Project deliverable7 2. 0 Problem analysis8 2. 1 Repeater8 2. 1. 1 Analog ue repeaters9 2. 1. 2 Digital repeaters10 2. 2 Inter symbol interference13 2. 3 Multipath propagation15 2. 3. 1 Multipath fading15 2. 4 The TV channels16 2. 5 Transmission cable18 . 6 Signal Amplifiers20 2. 7 Transmission delay (Coaxial cable)21 3. 0 Possible solution24 3. 1 RF amplifier25 3. 1. 1 The Transistor Amplifier26 3. 1. 2 Ultra High Frequency Transistor Array (HFA)29 3. 1. 3 Surface mounts technology:32 3. 1. 4 Surface Mount Monolithic Amplifier:32 3. 1. 5 Loft box: 8 way home distribution unit34 3. 2. 6 Maxview signal booster35 3. 2. 7 Antenna:36 4. 0 Design37 4. 1 Circuit design37 4. 2 PCB design38 5. 0 Implementation40 5. 1 Implementation with HFA312740 5. 2 Implementation with MAV-11SM amplifier41 6. 0 Test result42 6. 1 Laboratory test result42 6. 2 Field test result44 7. Result Discussion46 8. 0 Conclusion48 Future work:49 Works Cited50 Figure List Figure 1System block diagram6 Figure 2 Passive and Active repeater block diagram7 Figure 3 Analog repeater8 Figure 4 Dig ital repeater9 Figure 5 Channel management for digital repeater10 Figure 6 Channel management for analogue repeater10 Figure 7 Broadcast in valley with digital repeaters11 Figure 8 101101 transmitted data12 Figure 9 Received data12 Figure 10 Transmitted data vs. Received data13 Figure 11 Multipath propagation14 Figure 12 Cable loss in dB   (Antenna basics, 2008)18 Figure 13 Linear change phase vs frequency22Figure 14 The basic transistor amplifier26 Figure 15 HFA3127 transistor array30 Figure 16 MAV-11SM amplifier31 Figure 17 Suggested PCB layout with MAV-11SM33 Figure 18 Loft box home distributor33 Figure 19 Maxview signal booster35 Figure 20 Antenna used for this project35 Figure 21 Interference between relay signal and main transmitted signal36 Figure 22 ISIS schematic of circuit design37 Figure 23 PCB design according to the datasheet in ARES37 Figure 24 3D view for PCB38 Figure 25 Circuit with HFA3127 amplifier39 Figure 26 MAV-11SM amplifier circuit board40 Figure 27 HFA3127 gain with soldering error41Figure 28 HFA3127 amplifier gain41 Figure 29 One MAV-11SM amplifier gain42 Figure 30 Two MAV-11SM amplifier circuits give more gain42 Figure 31 Three amplifiers together was the maximum gain43 Figure 32 Low quality picture with normal antenna43 Figure 33 Picture with repeater connected antenna44 Figure 34 Rebroadcasting connection44 1. 0 Introduction 1. 1 Background: Digital Video Broadcasting (DVB) is being adopted as the standard for digital television in many countries. The DVB standard offers many advantages over the previous analogue standards and has enabled television to make a major step forwards in terms of its technology.Digital Video Broadcasting, DVB is now one of the success stories of modern broadcasting. The take up has been enormous and it is currently deployed in over 80 countries worldwide, including most of Europe and also within the USA. It offers advantages in terms of far greater efficiency in terms of spectrum usage and power utilisa tion as well as being able to affect considerably more facilities, the prospect of more channels and the ability to work alongside existing analogue services. (Pool, 2002) In these days when there are many ways in hich television can be carried from the â€Å"transmitter† to the â€Å"receiver† no one standard can be optimised for all applications. As a result there are many different forms of the Digital Video Broadcasting, DVB, standards, each designed for a given application. The main forms of DVB are summarised below: DVB Standard| Meaning| Description| DVB-C| Cable| The standard for delivery of video service via cable networks. | DVB-H| Handheld| DVB services to handheld devices, e. g. mobile phones, etc. | DVB-RSC| Return satellite channel| Satellite DVB services with a return channel for interactivity. DVB-S| Satellite services| DVB standard for delivery of television / video from a satellite. | DVB-SH| Satellite handheld| Delivery of DVB services from a satelli te to handheld devices| DVB-S2| Satellite second generation| The second generation of DVB satellite broadcasting. | DVB-T| Terrestrial| The standard for Digital Terrestrial Television Broadcasting. | Digital Video Broadcasting- Terrestrial (DVB-T) : The common perception of digital television these days is of broadcasts emanating from signal towers, bouncing off satellites, and being beamed to home receivers.This is the magic of  satellite  transmission, and it is reliable as long as the view of those satellites is not obscured. However, this is not the only way in which television signals are transmitted. Another popular method of transmitting signals  digital video broadcasting–terrestrial (DVB-T). When broadcasters employ this method, the digital signals do not leave the earth. The signals transmitted using  DVB-T  do not travel via cable, though; rather, they go from  antenna to aerial antenna, from signal blaster to home receiver. Digital signals are routinel y transmitted using terrestrial methods.The transmission method has different names in different parts of the world. DVB-T  is the name used in Europe and Australia. North American customers receive these signals using a set of standards approved by the Advanced Television Systems Committee (ATSC). In Japan, it is known as Integrated Services Digital Broadcasting–Terrestrial (IDSB-T). DVB-T  broadcasters transmit data using a compressed digital audio-video stream, with the entire process based on the  MPEG-2 standard. These transmissions can include all kinds of digital broadcasting, including  HDTV  and other high-intensity methods.This is a vast improvement over the old analog signals, which required separate streams of transmission. Oddly enough, some  DVB-T  transmissions take place over analog networks, with the antennas and receivers getting some helpful technological upgrades along the way. (Pool, 2002) 1. 2 Aim of this project The aim of this project is to investigate the design of a repeater for DVB-T system but incorporating a delay between receives and transmits signals to avoid Inter Symbol Interference (ISI). It is useful to use a repeater to boost the signal into areas of weak coverage in any radio wave communication system.However wave interference means the repeater usually requires a frequency shift for analogue modulated signals. For digitally modulated signals it may be possible to use the same frequency. The project will review the basics of current digital systems such as DVB (Broadcast TV) and WLAN – and to identify a suitable choice for a lab experiment. The practical side will be to design and build a repeater incorporating suitable transmission delay. 1. 3 Project objectives 1. Investigate and learn Inter Symbol Interference effect on received signal. 2.Investigate and learn the delay effect on received signal and cause of the delay. 3. Investigate and learn Multipath propagation and Doppler shift of the fre quencies. 4. Investigate and learn about Digital Video Broadcasting (DVB) techniques. 5. Investigate and learn about transmission delay of coaxial cable. 6. Investigate and learn about different type of Amplifier. 7. Designing repeater circuit. 8. Implementing circuit. 9. Testing the circuit. Figure 1System block diagram 1. 3 Project deliverable * System design * Circuit design * Documentation 2. 0 Problem analysis . 1 Repeater Repeaters provide an efficient solution to increase the coverage of the broadcasting networks. In the broadcasting networks, the network operators usually first put high power transmitters at the strategic points to quickly ensure an attractive coverage and then, in a second step, increase their coverage by placing low-power repeaters in the dead spot or shadow areas, such as a tunnel, valley or an indoor area. A repeater is simply a device that receives an analogue signal or a digital signal and regenerates the signal along the next leg of the medium.In DVB- T networks, there are two different kinds of repeaters. They are passive repeaters, which are also called as gap-fillers and active repeaters that are also called as regenerative repeaters. A passive repeater receives and retransmits a DVB-T signal without changing the signalling information bits. The signal is only boosted. An active repeater can demodulate the incoming signal, perform error recovery and then re-modulates the bit stream. The output of the error recovery can even be connected to a local re-multiplexer to enable insertion of local programmes.This means that the entire signal is regenerated. The building blocks of the passive and active repeater configurations are shown in Figure 1. Figure 2 Passive and Active repeater block diagram In a first step, DVB-T broadcasters, as all broadcasters, launch their networks with high power transmitters in strategic point in order to quickly insure an attractive coverage to TV operators and then, in a second step, increase their co verage by placing low power repeaters in shadow area. To repeat a DVB-T signal, two solutions can be used: An analogue repetition: in this case, repeaters use well-known techniques such as down conversion, filtering, up conversion and amplification. The signal is only boosted. * A digital repetition: this new type of repeater uses a professional DVB-T receiver to recover the programme stream (and correct all errors) carried in the RF channel, performs a new modulation followed by an up conversion and amplification. It means that the entire signal is regenerated. 2. 1. 1 Analogue repeaters In case of analogue repetition, the output signal quality cannot exceed the quality of the received signal because the signal is not regenerated.Figure 3 Analog repeater Furthermore, being a passive process, it degrades the signal; the phase noise of the local oscillator involves a degradation of the phase noise of the received signal and creates an inter-modulation. The local oscillator phase nois e adds to the phase noise of the received signal. In these conditions, what are the performances of analogue repetition for Modulation Error Ratio (MER) and Carrier to Noise ratio (C/N)? Of course, performances are linked to the technology but analogue repetition cannot be insured ad infinitum. And, if one link in the analogue repetition chain is weak, all the system is deficient. Trolet, 2002) 2. 1. 2 Digital repeaters In case of a digital repetition, the entire signal is regenerated; it means that repeaters, as transmitters, insure the quality of the broadcasted signal as long as it is able to demodulate it. Figure 4 Digital repeater The output signal quality is independent of the input signal quality: * Phase noise is linked to the local oscillator only, * A weak link, in a digital repetition chain, is erased by the following repeater, * Several digital repeaters can be cascaded without any cumulative degradation.Drawback of Digital repeater The delay inside a digital repeater is taller than the guard interval. So, the signal cannot be repeated on the frequency of the main transmitter: main transmitters and repeaters cannot operate in a Single Frequency Network (SFN) even with 8K carriers and a guard interval of 1/4. (Trolet, 2002) Figure 5 Channel management for digital repeater The delay inside an analogue repeater is lower than the guard interval and allows main transmitters and repeaters to operate in SFN mode. Figure 6 Channel management for analogue repeaterBut, with such technique, overlap between repeater cells and transmitter cell cannot be optimised/adjusted. Analogue repeaters have not the possibility to buffer the signal; they cannot add delay to move the overlap zone. To optimise single frequency network with this technique, two solutions: * Move the repeater that means you have to find new broadcasting site. * Reduce the output power of your repeaters and forbid overlap. So, to build an efficient Single Frequency Network (SFN), Broadcasters ha ve benefits in using transmitters: * Means more freedom for defining the size of the cells Means more freedom for defining the repeater locations Benefits of Digital Repeater * As long as the repeater is able to demodulate the RF channels, signal quality is independent of input signal quality. * Output MER > 33 dB (Trolet, 2002) * In theory, thanks to the forward error correction (FEC) and the output signal quality, digital repeaters can be cascaded ad infinitum. It is an efficient solution to broadcast in valleys. TV viewers and distant repeaters share the broadcasted signal. Figure 7 Broadcast in valley with digital repeaters The demodulation process, down to the programme stream, allows broadcasters to insert a local multiplexor in order to customize the content for a local broadcasting. More and more, local communities claim their local programmes. Digital repeaters offer a flexible solution to the network. * Shadow area can be covered by several repeaters. Repeaters operate tog ether in SFN mode without any external references (10 MHz and 1 PPS) (Trolet, 2002). In their internal memory, digital repeaters can buffer the signal so as to optimise overlaps. 2. 2 Inter symbol interferenceInter-symbol interference (ISI) is an unavoidable consequence of both wired and wireless communication systems. Morse first noticed it on the transatlantic telegraph cables transmitting messages using dots and dashes and it has not gone way since. He handled it by just slowing down the transmission. Amplitude Time Figure 8 101101 transmitted data Figure 8 shows a data sequence, 1,0,1,1,0, which wish to be sent. This sequence is in form of square pulses. Square pulses are nice as an abstraction but in practice they are hard to create and also require far too much bandwidth. Amplitude TimeFigure 9 Received data Figure 9 shows each symbol as it is received. It also shows what the transmission medium creates a tail of energy that lasts much longer than intended. The energy from sym bols 1and 2 goes all the way into symbol 3. Each symbol interferes with one or more of the subsequent symbols. The circled areas show areas of large interference. Amplitude Time Figure 10 Transmitted data vs. Received data Fig. 3 shows the actual signal seen by the receiver. It is the sum of all these distorted symbols. Compared to the transmitted signal, the received signal looks quite indistinct.The receiver does not actually this signal; it sees only the little dots, the value of the amplitude at the timing instant. Symbol 3, this value is approximately half of the transmitted value, which makes this particular symbol is more susceptible to noise and incorrect interpretation and this phenomena is the result of this symbol delay and smearing. This spreading and smearing of symbols such that the energy from one symbol effects the next ones in such a way that the received signal has a higher probability of being interpreted incorrectly is called Inter Symbol Interference or ISI.ISI can be caused by many different reasons. It can be caused by filtering effects from hardware or frequency selective fading, from non-linearity and from charging effects. Very few systems are immune from it and it is nearly always present in wireless communications. Communication system designs for both wired and wireless nearly always need to incorporate some way of controlling it. The main problem is that energy, which is been wishing to confine to one symbol, leaks into others. So one of the simplest things can be done to reduce ISI is to just slowing down the signal.Transmitting the next pulse of information only after allowing the received signal has damped down. The time it takes for the signal to die down is called delay spread, whereas the original time of the pulse is called the symbol time. If delay spread is less than or equal to the symbol time then no ISI will result, otherwise yes. (Charan, 2002) Slowing down the bit rate was the main way ISI was controlled on those ini tial transmission lines. Then faster chips came and allowed to do signal processing controlling ISI and transmission speeds increased accordingly. . 3 Multipath propagation Multipath propagation is caused by multipath receptions of the same signal. in city environment or indoors signal travels along different path from transmitter (Tx) to receiver (Rx). * Signal components received at slightly different times (delay) * These components are combined at Rx * Results as a signal that varies widely in amplitude, phase or polarization 2. 3. 1 Multipath fading When the components add destructively due to phase differences amplitude of the received signal is very small.At the other times the components add constructively the amplitude of received signal is large. This amplitude variations in the received signal called signal fading, are due to the time-variant characteristics of the channel. Relative motion between Tx and Rx (or surrounding objects causing e. g. reflection) causes random f requency modulation. Figure 11 Multipath propagation Each multipath component has different Doppler shift. The Doppler shift can be calculated by using: fd=V? cos? V is the velocity of the terminal ? is the spatial angle between the direction of motion and the wave ? is the wavelengthThe three most important effects of multipath fading and moving scatters are * Rapid changes in signal strength over a small travelled distance or time interval * Random frequency modulation due to varying Doppler shifts on different multipath signals. * Time dispersion (echoes) caused by multipath propagation 2. 4 The TV channels Hertz  (Hz) means  cycles per second. (Heinrich Hertz was the first to build a radio transmitter and receiver while understanding what he was doing. )  Ã‚  KHz means 1000 Hertz, MHz means 1,000,000 Hertz, and GHz means 1,000,000,000 Hertz The radio frequency spectrum is divided into major bands:Frequency  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Wave length  (in meters) VLF  Ã‚  Ã‚  Ã‚  Ã‚  very low frequency  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  3 KHz – 30 KHz  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   100 Km – 10 Km LF  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  low frequency  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   30 KHz – 300 KHz  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚      10 Km – 1 Km MF  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  medium frequency  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  300 KHz – 3 MHz  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   1 Km – 100 m HF  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  high frequency 3 MHz – 30 MHz  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   100 m – 10 m VHF  Ã‚  Ã‚  Ã‚  very high frequency  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  30 MHz – 300 MHz  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   10 m – 1 m UHF  Ã‚  Ã‚  Ã‚  ultra high frequency  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  300 MHz â €“ 3 GHz  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   1 m – 100 mm SHF  Ã‚  Ã‚  Ã‚  super high frequency  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   3 GHz – 30 GHz  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚      100 mm – 10 mm EHF  Ã‚  Ã‚  Ã‚  extremely high frequency  Ã‚  Ã‚  Ã‚   30 GHz – 300 GHz  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   10 mm – 1 mm (Antenna basics, 2008) The UK uses UHF for terrestrial television transmissions, with both PAL-I analogue broadcasts and DVB-T digital broadcasts sharing the band. The following table is a handy channel/frequency conversion table showing the E channel number, PAL-I vision and sound carrier frequencies, and the centre frequency for digital tuning. The frequency plan for the UK involves each channel having an 8MHz bandwidth – the space in the spectrum that each channel is allotted. The PAL-I standard specifies a video bandwidth of 5. 0 MHz and an audio carrier at 6 MHz.The DVB-T tran smissions must fall within this channel plan, resulting in each digital channel also having a bandwidth of 8 MHz. Unlike PAL-I, the digital channel (carrying a multiplexed signal) utilises the entire bandwidth available to it simultaneously, transmitting 2048 carriers (in â€Å"2k mode†). For tuning purposes, a centre frequency is used (Table is included in appendices). (digital spy, 2009) Decibels Decibels (dB) are commonly used to describe gain or loss in circuits. The number of decibels is found from: Gain in dB = 10*log(gain factor)  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  or (Antenna basics, 2008) In some situations this is more complicated than using gain or loss factors. But in many situations, decibels are simpler.For example, suppose 10 feet of cable loses 1 dB of signal. To figure the loss in a longer cable, just add 1 dB for every 10 feet. In general, decibels let add or subtract instead of multiply or divide. Noise Whether a signal is receivable is determined by the  signal t o noise ratio  (S/N). For TVs there are two main sources of noise: 1. Atmosphere noise. There are many types of sources for this noise. A light switch creates a radio wave every time it opens or closes. Motors in some appliances produce nasty  RF  (radio frequency) noise. 2. Receiver noise. Most of this noise comes from the first transistor the antenna is attached to. Some receivers are quieter than others. 2. Transmission cable Twin lead (ribbon cable) used to be common for TV antennas. It has its advantages. But due to its unpredictability when positioned near metal or dielectric objects, it has fallen out of favour. Coaxial cable is recommended. It is fully shielded and not affected by nearby objects. Transmission cable has a feature called its  characteristic impedance, which for TV coax should always be 75 ohms. Although rated in ohms, this has nothing to do with resistance. A resistor converts electric energy into heat. The â€Å"75 ohms† of a coaxial cable does not cause heat. Where it comes from is mathematically complicated and beyond our scope here.But coax also has ordinary resistance (mostly in the center conductor) and thus loses some of the signal, converting it into heat. The amount of this dissipation (loss) depends on the frequency as well as the cable length. Type:  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Centre conductor:  Ã‚  Ã‚  Ã‚  Cable diameter:   Ã‚  Ã‚  Ã‚  RG-59  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  20-23 gauge  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  0. 242 inches   Ã‚  Ã‚  Ã‚  RG-6  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  18 gauge  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  0. 265 inches   Ã‚  Ã‚  Ã‚  RG-11  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  14 gauge  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  0. 405 inches Figure 12 Cable loss in dB   (Antenna basics, 2008) The above chart is only approximate. There are many cable manufacturers for each type and there is no enforcement of stand ards. If the mast-mounted amplifier gain exceeds the cable loss then it shouldn’t matter what cable you use.But there are two problems with this: * Some cable has incomplete shielding. This is most common for RG-59, another reason to avoid it. * When the cable run is longer than 200 feet, the low-numbered channels can become too strong relative to the high-numbered channels. In this case, RG-11 or an ultra-low-loss RG-6 is recommended. (These alternatives are expensive. )  Ã‚  Alternatively, frequency compensated amplifiers will work. 2. 6 Signal Amplifiers There are two types of signal amplifiers: Preamplifiers  Ã‚  (Mast-mounted amplifiers)  Ã‚  Ã¢â‚¬â€œÃ‚  Ã‚  These should be mounted as close to the antenna as possible. Usually the amplifier comes in two parts: 1. The amplifier.This is an outdoor unit that is normally bolted to the antenna mast. It must have a very low noise figure, and enough gain to overcome the cable loss and the receiver’s noise figure. 2. The power module (power injector). This is an indoor unit that commonly lies on the floor behind the TV. It is inserted into the antenna cable between the amplifier and the TV. This module injects some power, usually DC, into the coaxial cable where the amplifier can use it. The power injector is the amplifier’s power supply. Distribution amplifiers  Ã‚  Ã¢â‚¬â€œÃ‚  Ã‚  These are simple signal boosters. They are often necessary when an antenna drives multiple TVs or when the antenna cable is longer than 150 feet.Distribution amplifiers don’t need to have a low noise figure, but they need to be able to handle large signals without overloading. Commonly, distribution amplifiers have multiple outputs. (Unused outputs usually do not need to be terminated. ) Never feed an amplifier output directly into another amplifier. There should always be a long cable between the preamplifier and the distribution amplifier. Placing the two amplifiers close together can cause overloa d and/or oscillation. A mast-mounted amplifier’s most important characteristic is its noise level, usually specified by the  noise figure. But many manufacturers don’t take this number seriously. If it is given at all, it is often wrong. If all makers don’t do them right then comparison-shopping is not possible.The author is inclined to rate amplifiers for their noise figures as follows:   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  0. 5 dB  superb (anything better runs into thermal atmospheric noise)   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  2. 0 dB  excellent 4. 0 dB  fair 6. 0 dB  poor 10 dB  awful 2. 7 Transmission delay (Coaxial cable) Transmission lines are described by their two most important characteristics: the characteristic impedance Zo and the delay. For instance, a â€Å"short† (say 0. 01 wavelength) piece of coaxial cable such RG-58U has been taken and measured its capacitance with the other end open. A one foot length yields more or less 31. 2 pF. The inductance also has been measured with the other end shorted. It yields 76. 8 nH. The impedance may now be computed as: Zo=LC Zo=76. ? 10-931. 2? 10-12=49. 6 ohms Here L and C are measured for the same length. The delay may also be computed: Delay= L? C Delay= 76. 8? 10-9? 31. 2? 10-12=1. 55 nSec For an ideal line, the delay increases linearly with its length, while its impedance remains constant. After that it has been computed the velocity in foot per second: V=lendelay V=11. 55? 10-9=6. 46? 108 foot per second or meters/second 8 10*966. 1 This is less than the speed of light. The ratio of the above speed to the speed of light gives the velocity factor Vf: Vf=1. 966? 1082. 998? 108=0. 666 or 66. % of the speed of light As mentioned earlier, the delay increases linearly with the line length. For a given length, the phase difference between the input and output will increase with the frequency: ? =2? f? delay Here the phase ? is in radians and the frequency f is Hertz. Converting the phase from ra dians to degrees requires multiplying by: 3602? In this case if frequency is 900 MHz so phase delay will be ?deg=f? 360? delay=900? 106? 360? 1. 55? 10-9? 502. 2 This length that gives 90 degrees of phase shift is also known as a quarter wavelength. Figure 13 Linear change phase vs frequency Figure-13 An ideal transmission line gives a linear change of phase versus frequency.The distributed inductance and capacitance are the basic transmission line parameters. From these, it can be calculated the line impedance, the delay in terms of time and phase, the speed of propagation and the velocity factor. The inductive component has an additional component at the lower frequencies which slows the signal somewhat. This occurs around 100 KHz for small coax and lower for larger cables. For frequencies above 1 MHz, the dielectric constant of the cable is probably responsible for the decrease in the delay. Measuring the delay of cables can reveal some â€Å"hidden† properties that could make it unsuitable for some applications, such as carrying wideband data. (Audet, 2001) 3. 0 Possible solutionThe main component of a repeater is amplifier. There are many types of amplifier can be used for this job. RF amplifiers are electronic devices that accept a varying input signal and produce an output signal that varies in the same way as the input, but that has larger amplitude. RF amplifiers generate a completely new output signal based on the input, which may be voltage, current, or another type of signal. Usually, the input and output signals are of the same type; however, separate circuits are used. The input circuit applies varying resistance to an output circuit generated by the power supply, which smoothes the current to generate an even, uninterrupted signal.Depending on load of the output circuit, one or more RF pre-amplifiers may boost the signal and send the stronger output to a RF  power amplifier  (PA). Other types of RF amplifiers include low noise, pulse, bi-directional, multi-carrier, buffer, and limiting amplifiers. Detector log video amplifiers (DLVAs) are used to amplify or measure  signals with  a wide dynamic range and wide broadband. Successive detection log  video amplifiers (SDLVAs)  are log amplifiers that can operate over a wider dynamic range than DLVAs, while extended range detector log video amplifiers (ERDLVAs)  are  DLVAs that can operate with a wider operating frequency. (Global Spec, 2008) * Military / Defense * Mobile / Wireless  Systems * Plasma / Electron Laser * RF Induction Heating * Radar SystemsAmplifier Type: Applications: * Low Noise Amplifier * Power Amplifier * Bi-directional Amplifier * Multi-carrier Amplifier * Multiplier (RF amplifier, 2008) 3. 1 RF amplifier Selecting RF amplifiers requires an analysis of several performance specifications. Operating frequency is the frequency range for which RF amplifiers meet all guaranteed specifications. Design gain, the ratio of the output to the i nput power, is normally expressed in decibels (dB), or Gdb  = 10 * log (Po/Pi) Output power is  the signal power at the output of the amplifier under specified conditions such as temperature, load, voltage standing wave ratio (VSWR), and supply voltage.Gain flatness indicates the degree of the gain variation over its range of operating wavelengths. Secondary performance specifications to consider include noise figure (NF), input VSWR, output VSWR, and monolithic microwave integrated circuit (MMIC) technology. The noise figure, a measure of the amount of noise added to the signal during normal operation, is the ratio of the signal-to-noise ratio at the input of the component and the signal-to-noise ratio measured at the output. The NF value sets the lower limit of the dynamic range of the amplifier. Input VSWR and output VSWR are unit-less ratios ranging from  1 to infinity that express the amount of reflected energy. Global Spec, 2008) There are several physical and electrical specifications to consider when selecting RF amplifiers. Physical specifications include package type and connector type. Package types include  surface mount technology (SMT),  flat pack, and  through hole technology (THT). RF amplifiers may also be  connector zed  or use waveguide assemblies. Connector types include BNC, MCX, Mini UHF, MMCX, SMA, SMB, SMP, TNC, Type F, Type N, UHF, 1. 6 / 5. 6, and 7/16. Important electrical characteristics include nominal operating voltage and nominal impedance. Operating temperature is an important environmental parameter to consider. (Global Spec, 2008) 3. 1. 1 The Transistor AmplifierIn the preceding section explains the internal workings of the transistor and will introduce new terms, such as emitter, base, and collector. Here it discusses the overall operation of transistor amplifier. To understand the overall operation of the transistor amplifier, it must have to only consider the current in and out of the transistor and through the various components in the circuit. Therefore, from this point on, only the schematic symbol for the transistor will be used in the illustrations, and rather than thinking about majority and minority carriers that mean it will be only emitter, base and collector current. Before going into the basic transistor amplifier, there are two terms it should be familiar with: AMPLIFICATION and AMPLIFIER.Amplification is the process of increasing the strength of a SIGNAL. A signal is just a general term used to refer to any particular current, voltage, or power in a circuit. An amplifier is the  device  that provides amplification (the increase in current, voltage, or power of a signal) without appreciably altering the original signal. Transistors are frequently used as amplifiers. Some transistor circuits are CURRENT amplifiers, with a small load resistance; other circuits are designed for VOLTAGE amplification and have a high load resistance; others amplify POWER. By inserting one or more resistors in a circuit, different methods of biasing may be achieved and the emitter-base battery eliminated.In addition to eliminating the battery, some of these biasing methods compensate for slight variations in transistor characteristics and changes in transistor conduction resulting from temperature irregularities. Notice in figure 2-12 that the emitter-base battery has been eliminated and the bias resistor RB  has been inserted between the collector and the base. Resistor RB  provides the necessary forward bias for the emitter-base junction. Current flows in the emitter-base bias circuit from ground to the emitter, out the base lead, and through RB  to VCC. Since the current in the base circuit is very small (a few hundred microamperes) and the forward resistance of the transistor is low, only a few tenths of a volt of positive bias will be felt on the base of the transistor.However, this is enough voltage on the base, along with ground on the emitter and the large positive voltage on the collector, to properly bias the transistor. (Intregrated Publishing, 2002) Figure 14 The basic transistor amplifier With Q1 properly biased, direct current flows continuously, with or without an input signal, throughout the entire circuit. The direct current flowing through the circuit develops more than just base bias; it also develops the collector voltage (VC) as it flows through Q1 and RL. Notice the collector voltage on the output graph. Since it is present in the circuit without an input signal, the output signal starts at the VC  level and either increases or decreases.These dc voltages and currents that exist in the circuit before the application of a signal are known as quiescent voltages and currents (the quiescent state of the circuit). Resistor RL, the collector load resistor, is placed in the circuit to keep the full effect of the collector supply voltage off the collector. This permits the collector voltage (VC) to change with an input signal , which in turn allows the transistor to amplify voltage. Without RL  in the circuit, the voltage on the collector would always be equal to VCC. The coupling capacitor (CC) is another new addition to the transistor circuit. It is used to pass the ac input signal and block the dc voltage from the preceding circuit. This prevents dc in the circuitry on the left of the coupling capacitor from affecting the bias on Q1.The coupling capacitor also blocks the bias of Q1 from reaching the input signal source. The input to the amplifier is a sine wave that varies a few millivolts above and below zero. It is introduced into the circuit by the coupling capacitor and is applied between the base and emitter. As the input signal goes positive, the voltage across the emitter-base junction becomes more positive. This in effect increases forward bias, which causes base current to increase at the same rate as that of the input sine wave. Emitter and collector currents also increase but much more th an the base current. With an increase in collector current, more voltage is developed across R  L.Since the voltage across RL  and the voltage across Q1 (collector to emitter) must add up to VCC, an increase in voltage across RL  results in an equal decrease in voltage across Q1. Therefore, the output voltage from the amplifier, taken at the collector of Q1 with respect to the emitter, is a  negative  alternation of voltage that is  larger  than the input, but has the same sine wave characteristics. During the negative alternation of the input, the input signal opposes the forward bias. This action decreases base current, which results in a decrease in both emitter and collector currents. The decrease in current through RL  decreases its voltage drop and causes the voltage across the transistor to rise along with the output voltage.Therefore, the output for the negative alternation of the input is a  positive  alternation of voltage that is  larger  than the input but has the same sine wave characteristics. By examining both input and output signals for one complete alternation of the input, we can see that the output of the amplifier is an exact reproduction of the input except for the  reversal in polarity  and the  increased amplitude  (a few millivolts as compared to a few volts). The PNP version of this amplifier is shown in the upper part of the figure. The primary difference between the NPN and PNP amplifier is the polarity of the source voltage. With a negative VCC, the PNP base voltage is slightly negative with respect to ground, which provides the necessary forward bias condition between the emitter and base.When the PNP input signal goes positive, it opposes the forward bias of the transistor. This action cancels some of the negative voltage across the emitter-base junction, which reduces the current through the transistor. Therefore, the voltage across the load resistor decreases, and the voltage across the transisto r increases. Since VCC  is negative, the voltage on the collector (VC) goes in a negative direction (as shown on the output graph) toward -VCC  (for example, from -5 volts to -7 volts). Thus, the output is a negative alternation of voltage that varies at the same rate as the sine wave input, but it is opposite in polarity and has a much larger amplitude.During the negative alternation of the input signal, the transistor current increases because the input voltage aids the forward bias. Therefore, the voltage across RL  increases, and consequently, the voltage across the transistor decreases or goes in a positive direction (for example: from -5 volts to -3 volts). This action results in a positive output voltage, which has the same characteristics as the input except that it has been amplified and the polarity is reversed. (Intregrated Publishing, 2002) 3. 1. 2 Ultra High Frequency Transistor Array (HFA) The HFA3046, HFA3096, HFA3127 and the HFA3128 are Ultra High Frequency Tra nsistor Arrays that are fabricated from Intersil Corporation’s complementary bipolar UHF-1 process.Each array consists of five dielectrically isolated transistors on a common monolithic substrate. The NPN transistors exhibit a fT of 8GHz while the PNP transistors provide a fT of 5. 5GHz. Both types exhibit low noise (3. 5dB), making them ideal for high frequency amplifier and mixer applications. (HFA3127, 2003) The HFA3046 and HFA3127 are all NPN arrays while the HFA3128 has all PNP transistors. The HFA3096 is an NPN-PNP combination. Access is provided to each of the terminals for the individual transistors for maximum application flexibility. Monolithic construction of these transistor arrays provides close electrical and thermal matching of the five transistors. Features * NPN Transistor (fT) . . . . . . . . . . . . . . . . . . . . . . . . 8GHz * NPN Current Gain (hFE). . . . . . . . . . . . . . . . . . . . . . . . 130 * NPN Early Voltage (VA) . . . . . . . . . . . . . . . . . . . . . . . 50V * PNP Transistor (fT). . . . . . . . . . . . . . . . . . . . . . . . . 5. 5GHz * PNP Current Gain (hFE). . . . . . . . . . . . . . . . . . . . . . . . . 60 * PNP Early Voltage (VA) . . . . . . . . . . . . . . . . . . . . . . . .20V * Noise Figure (50? ) at 1. 0GHz . . . . . . . . . . . . . . . . . 3. 5dB * Collector to Collector Leakage . . . . . . . . . . . . . . . . . .30 dB) and this transistor amplifier gain was not enough for rebroadcasting signal, this project select another amplifier MAV-11SM from supervisor suggestion. One MAV-11SM amplifier gives around 10dB gain what has been shown in testing section. At last two MAV-11SM amplifiers and one HFA3127 has been used to get more than 30dB gain. It has been tested in network scalar analyzer. For field test, a TV card, three TV aerials have been used. The amplifier circuit has been connected with one aerial. It was working very well when it was directly connected with TV card. That it can be said that the repe ater was amplifying signal.But when another aerial with long transmission line was connected with amplifier and tried to rebroadcast the signal with 5v 1A power supply, TV picture quality was not improving expectedly. Digital repetition is an innovative concept, which helps to increase the DVB-T coverage while maintaining the highest quality and providing a greater flexibility. In spite of failure, this project was a high level platform to learn about signal and signalling. Future work: As this project is unsuccessful at that certain point, this project will try to solve the rebroadcasting problem. And the transistor array will be a great option to amplify signal if all five transistors are been used. From HFA3127, it is possible to get min of 120 dB gain if it is soldered perfectly. Works CitedAntenna basics. (2008, October 12). Retrieved May 5, 2011, from http://www. hdtvprimer. com/ANTENNAS/basics. html. Audet, J. (2001). Coaxial Cable Delay. Charan, L. (2002). Inter symbos Inter ferance (ISI) and Raised Cosine filters. Retrieved December 5, 2010, from http://www. complextoreal. com/chapters/isi. pdf. Datasheet. (2005, December 21). Retrieved February 20, 2011, from http://www. intersil. com/data/fn/fn3076. pdf. digital spy. (2009). Retrieved April 10, 2011, from http://www. digitalspy. co. uk/digitaltv/information/a12613/uhf-channel-and-frequency-guide. html. Global Spec. (2008). Retrieved April 10, 2011, from http://www. globalspec. om/learnmore/telecommunications_networking/rf_microwave_wireless_components/rf_amplifiers. HFA3127. (2003). Retrieved January 18, 2011, from http://www. intersil. com/products/deviceinfo. asp? pn=HFA3127. Intregrated Publishing. (n. d. ). Retrieved April 4, 2011, from http://www. tpub. com/neets/book7/25c. htm. Monolithic Amplifier. (2002). Retrieved January 14, 2011, from http://www. minicircuits. com/pdfs/MAV-11SM+. pdf. Pool, I. (2002). Digital Video Broadcasting. Retrieved April 13, 2011, from http://www. radio-electronics. com/info/broadcast/digital-video-broadcasting/what-is-dvb-tutorial. php. Power Amplifier design. (1998). RF transmitting transistor and power ampli? er fundamentals . RF amplifier. (2008).Retrieved April 10, 2011, from http://www. globalspec. com/learnmore/telecommunications_networking/rf_microwave_wireless_components/rf_amplifiers. sub-TV. (2006, October 13). Retrieved April 20, 2011, from http://www. sub-tv. co. uk/antennatheory. asp. Trolet, C. (2002). SPOT: filling gaps in DVB-T networks with digital repeaters. Presented by Gerard Faria, Scientific Director, Harris Broadcast Europe at BroadcastAsia2002 International Conference, Available at: http://www. broadcast. harris. com. Gantt chart APPENDICES Frequency Allocation for DVB-T in UK Band IV Channel| PAL-I Vision (MHz)| PAL-I Sound (MHz)| Centre (MHz)| 21| 471. 25| 477. 25| 474| 22| 479. 25| 485. 25| 482| 3| 487. 25| 493. 25| 490| 24| 495. 25| 501. 25| 498| 25| 503. 25| 509. 25| 506| 26| 511. 25| 517. 25| 514| 27| 519. 25| 52 5. 25| 522| 28| 527. 25| 533. 25| 530| 29| 535. 25| 541. 25| 538| 30| 543. 25| 549. 25| 546| 31| 551. 25| 557. 25| 554| 32| 559. 25| 565. 25| 562| 33| 567. 25| 573. 25| 570| 34| 575. 25| 581. 25| 578| 35| 583. 25| 589. 25| 586| 36| 591. 25| 597. 25| 594| 37| 599. 25| 605. 25| 602| 38| 607. 25| 613. 25| 610| Band V Channel| PAL-I Vision (MHz)| PAL-I Sound (MHz)| Centre (MHz)| 39| 615. 25| 621. 25| 618| 40| 623. 25| 629. 25| 626| 41| 631. 25| 637. 25| 634| 42| 639. 25| 645. 25| 642| 43| 647. 25| 653. 25| 650| 44| 655. 25| 661. 5| 658| 45| 663. 25| 669. 25| 666| 46| 671. 25| 677. 25| 674| 47| 679. 25| 685. 25| 682| 48| 687. 25| 693. 25| 690| 49| 695. 25| 701. 25| 698| 50| 703. 25| 709. 25| 706| 51| 711. 25| 717. 25| 714| 52| 719. 25| 725. 25| 722| 53| 727. 25| 733. 25| 730| 54| 735. 25| 741. 25| 738| 55| 743. 25| 749. 25| 746| 56| 751. 25| 757. 25| 754| 57| 759. 25| 765. 25| 762| 58| 767. 25| 773. 25| 770| 59| 775. 25| 781. 25| 778| 60| 783. 25| 789. 25| 786| 61| 791. 25| 797. 25| 794| 62| 799. 25| 805. 25| 802| 63| 807. 25| 813. 25| 810| 64| 815. 25| 821. 25| 818| 65| 823. 25| 829. 25| 826| 66| 831. 25| 837. 25| 834| 67| 839. 25| 845. 25| 842| 68| 847. 25| 853. 25| 850|