The Physics of an AM Radio Receiver :: Radio Technology Electronics Essays

The Physics of an AM Radio Receiver The AM Radio has been around for a long time. When the AM radio was first invented, it was not meant to be used to broadcast music. That is why today most music radio stations are on the FM band. Instead, the AM band was used to carry voice frequencies, thus, all the AM talk radio stations. Due to new technology, music is broadcast over the AM band but does not have the same sound quality as the FM band. According to the FCC regulations at www.fcc.gov, the AM broadcasters are only allowed 5 KHz each side of their carrier frequency for their side bands. These side bands will be explained in more detail later on. In order to understand an AM receiver, one must understand each stage and what it does. An AM receiver can be broken down into six stages. These stages will be explained one at a time. The first stage is the RF amplifier. The AM antenna runs into the RF amp where the desired frequency is selected. As stated by Grob (1997), the typical band for AM is 535 Hz to 1605 KHz. For the duration of the paper, we will assume that we are trying to receive a station that is located on 1290 KHz signal. The antenna used must be able to pick up all the stations on the AM dial. Knowing this, we need to select the one we want to hear. In this case, we want 1290 KHz or The Country KOWW. When the dial on the radio is turned to select 1290 KHz, it does two things. There are two variable capacitors The Physics of an AM Radio Receiver being adjusted. I will begin by discussing the first capacitor. This capacitor is connected in parallel with an inductor. While the capacitance changes as the dial is turned, the resonant frequency of the LC circuit also changes. This process is called inductor and capacitor in parallel. When the capacitor is in just the right spot, the resonant frequency will be 1290 KHz. This LC circuit is designed so that only the resonant frequency is passed. The 1290 KHz will now be passed on to the next stage and all other frequencies will be filtered out. The RF amp must also have good sensitivity, which according to Scott Rasmussen (2003), is the ability to amplify a very weak signal.

Critical Thinking â€Factors that Influence Adult Learning Essay

Being able to read and understand research studies requires quantitative reasoning. The purpose of this assignment is to help you get accustomed to identifying the various parts of a research study. Be sure to review the module homepage and background information before you begin any of the assignments in this course. In general, the best way to approach the assignment is to read the article through rather rapidly in order to get an impression of its general content; then read it more slowly and make appropriate notes so you can complete the assignment as directed below. Organize your paper using these headings, in this order. Your paper should look like the following list/outline, with these same subheadings listed in the same order. Just provide the information for each section. I already know that the authors of the article can identify their purpose, hypothesis, etc. so you will not earn credit for copying the information from the article. Show me what you understand after reading the article. Explain each section very briefly so I can see what you learned from reading the article. Your summary of each section must be written in your own words. Do not copy or simply paraphrase. Reference: This should be so accurate that the reader can go directly from your abstract to the original article. Give a complete APA style reference. (Hint: the reference above is in APA style, so your reference should like that) Purpose of the study: Sometimes the purpose is stated as an aim, an objective, or a goal. At other times, it is incorporated in a statement of a problem, leaving the reader to infer the purpose has a stated problem, a purpose, or both. If the purpose is inferred, you may state it in your own words. Participants: The term â€Å"participant† refers to the sample studied. Under this heading, you should include a description of ages, sexes, socio-economic status, school grade, mental level, number, and/or any other demographic characteristics given in the article to describe the particular sample used in the study. Type of Study: Was it a quantitative or a qualitative study? Or were both types of data used? Please explain why you think so. Hypothesis: What is the hypothesis of the study? If the hypothesis is inferred, you may state it in your own words. Procedure: Sometimes the procedure is referred to as the â€Å"method† and includes a description of control techniques, measuring devices, materials used and ways of proceeding, in attempting to achieve the purpose or purposes of the study. Statistical Tests: Identify the statistical tests used in the article; examples might be chi square (x2), t-test, f-test, Mann-Whitney, etc. Results or Findings: What actual data was reported by the author of the study? Explain the results — don’t just copy them. Conclusions: What does the author of the research article believe the results or findings mean? Critique: In each of the previous sections, you have been reporting what the article said. Now, I want you to think critically about what you’ve learned, and give me your own thoughts. Briefly describe your reaction to the article. For example, was it well-organized? Easy or difficult to understand (please explain why)? Did it present diverse perspectives about the topic? Don’t limit yourself to just these questions — be reflective about what you read. Critical Thinking –Factors that Influence Adult Learning Reference: Vonderwell, S. , & Zachariah, S. (2005). Factors that influence participation in online learning. Journal of Research on Technology in Education, 38(2), 213-230. Retrieved from http://search. proquest. com/docview/274761283? accountid=28844. Park, J. , & Choi, H. J. (2009). Factors influencing adult learners’ decision to drop out or persist in online learning. Journal of Educational Technology & Society, 12(4), 207-n/a. Retrieved from http://search. proquest. com/docview/1287038599? ccountid=28844 Purpose of the study: Vonderwell and Zachariah conducted a study to look at the factors that influenced learner participation. They looked into several sections at the Midwestern University. They found that for online comprehension must have common goals as all the members are dependent on each other for success creating a learning community and not just an individual (Vonderwell, S. , & Zachariah, S. 2005). P articipants: This study encompassed 147 learners that discontinued in one to three online courses between the fall of 2005 through the summer of 2007. This study was conducted with males and females from the ages of 20 to over 40. Type of Study: This was a quantitative and a qualitative study. This study was a quantitative study as it showed the number of learners that drop out due to varies variables: scheduling conflicts, family and personnel issues, financial problems, managerial support. This study is also expressed as a quantitative as its goal is to show the dropout rate and change the behavior from a broader perspective and a more personable way as to check on the students and see their status. Hypothesis: I believe from this study that adult online learners are more likely to drop out when they do not receive support from their internal and external structures and sources that lead guide and motivate their lives independently along with enrolling in course that are able to effect and are relevant to their lives. Procedure: The method of this study was conducted was population and sample Statistical Tests: This study used the longitudinal process of dropout distance education test, the estimated marginal means of relevance, estimated marginal means of satisfaction. Results or Findings: This study showed that there are many factors that affect online learners such as external factors (family), internal (to themselves) and the difference in what the learners desires in an online course and resolving to remain motivated in the course if it is relevant to their life in some way. Critique: As I am not best person with reading comprehension and am a bottle line up front (BLUF) this article was a dry read to me and rather difficult to pick out all the test that were conducted. Although, the overall result were very plainly stated that online learner has outside influences that guide them in the completion of a course and their motivation to remain. I thought it was interesting that the study addressed administrators and instructors roles strictly to support the student on all levels where possible. Conclusions: This study concluded that online learns are more likely to drop out when they don’t receive support (weather internal, external, and personal). Also, it showed that online student are less likely to drop out when they are motivated by the course and are content with and the practicality to their own lives.

The Role of Social Media in Revolutionary Events - 665 Words

Current and revolutionary events around the world raise two questions: What role does social media play in these revolutions? Should we credit social media with the outcomes of these events just because they are somewhat involved? In â€Å"Small Change,† by Malcolm Gladwell, Gladwell stresses how modern-day social media websites are of no comparison to the strong bonds and hierarchies that contributed to most of the reformation that happened during the Civil Rights Movement. He suggests that social media websites have networking opportunities only. â€Å"Reforming Egypt in 140 Characters,† an article by Dennis Baron, supports this claim indirectly by stating that even though social media can get the word out, no website can replace the voices of people, or their rebellious spirit. I concur with both authors. People can use Facebook and Twitter all they want in order to spread the word, but without their thoughts and intuitions, these networks are useless. In his opening paragraph of â€Å"Reforming Egypt in 140 Characters,† Dennis Baron acknowledges the role of Twitter and other huge forms of social media in the impeachment of the the Egyptian president, Hosni Mubarak. However, Baron then points out that the protest continues in Cairo despite the governments shut down of the internet. He says, â€Å"that while the Iran protests may have been tweeted round the world, there were few Twitter users actually in-country; and that although Americans cant seem to survive without the constantShow MoreRelatedThe Impact Of Facebook On Citizen Engagement1196 Words   |  5 Pageson the power that social media sites possess on citizen engagement. However, a study done in 2011 examined the usefulness of Facebook pages as a way to connect citizens with each other (many-to-many) for policy input versus the utilization of those social media sites to transmit to and receive from government to citizens (one-to-many) in a more authoritative manner . The stud y was done to examine the use of Facebook to maintain power relations and inform citizens about their views rather than usingRead MoreEssay about Corrupted Media in Egypt872 Words   |  4 PagesAfter the 25th of January revolution in Egypt, the media started to be the backbone of the Egyptian social political lifestyle. The media forms the people’s opinions towards a certain candidate, propagate against an ideology or a movement. Before the presidential election in Egypt, each political party started to open its own TV channels publicizing their own agendas and thoughts on certain issues and problems that faces the Egyptian at the time, for example, a writer by the name Abdel Moneim saysRead MoreThe Work Of Art And The Age Of Mechanical Reproduction1180 Words   |  5 Pagesoxforddictionaries.com the definition of the word media is, â€Å"The main means of mass communication (broadcasting, publishing, and the Internet), regarded collectively.† Mass communication inv entions like paper, the printing press, and film changed the foundations in which society was built on. In todays society, it seems like everyday there is a new development in media that â€Å"will change our lives†. Instagram, Facebook, Twitter, are all forms of mass media, but one could dispute that they are unnecessaryRead MoreEssay on Hezbollah: Lebanese Shiite Militia956 Words   |  4 Pagesdespises Israel and the United States. To the Arabs, Hezbollah is known as a resistance group that provides socioeconomic and social services to Shiite communities is southern Lebanon.# The group as been held accountable for several attacks against Israel and Western targets, but yet provides social services in Lebanon by running hospitals, schools, orphanages, and media outlets. It has adopted the strategy of constantly altering public opinion by using a mixture of political and ideological agendasRead MoreHow An Organization Utilizes The Power Of Digital Media Essay1508 Words   |  7 PagesThe advent of digital media in today’s day and age has widened and ultimately transformed how organizations communicate with prospective and current customers. Web videos, e-books, and social media have each shaped the communication strategies organizations employ to engage customers. Organizations are fundamentally changing the business ecosystem by using digital media tools in unique and creative ways. Synopsis This case study will aim to demonstrate examples of how an organization utilizesRead MoreEssay on The Public Sphere912 Words   |  4 PagesThe Public Sphere So many definitions are there of the public sphere. One can range from a scale as small as a township to a scale as large as a national government. In the earlier post-revolutionary days of the United States, just what the United States actually was and what it meant were still being defined. Now that the revolution was over, words such as nationalism and patriotism must be redefined. Many politicians, political groups, and theRead MoreSmall Change: Why the Revolution Will not be Tweeted1744 Words   |  7 Pagescontribution of web-based social networking to the advent of progressive social movement and change. Gladwell’s bold declaration that the revolution will not be tweeted is reflective of his view that social media has no useful application in serious activism. Contrasting various elements of the â€Å"high-stakes† lunch-counter protests in Greensboro, North Carolina in the 1960’s with the â€Å"low-stakes† activism achieved through social media, Gladwell concludes that effective social movements powerful enoughRead MoreYoung Lords Essay Outline742 Words   |  3 PagesRican woman died of a minor surgical procedure, the Young Lords created a support program in which 600 people served the role of nurses and helped people catalog hospitals in the city of New York as hospitals that demonstrate blatant disregard for human life, accordin g to the website â€Å"palante! A brief history of the Young Lords.† The program was called â€Å"Health Revolutionary Unity Movement† (HRUM). The Young Lords did door-to-door giving people medical test,and when they saw the city had a testingRead MoreA Discussion On The Green Movement1645 Words   |  7 Pagescommon issues and criticize the state without fear. Habermas’ definition of the public sphere reminds places such as salons, coffee shops and teahouses rather than Internet- based spheres. In this regard, post-Habermasian thinkers assert that all social media and technology-based apparatuses can be studied as a new realm of the public sphere. This approach goes beyond the basic description in which Habermas (1982) refers to the 17th and 18th centuries that only represents the bourgeois families merelyRead MoreCuba And Its Effects On America969 Words   |  4 Pages The history of Cuba has gone through many dramatic changes affecting not only the eco nomy but the citizens as well. On January 1st, 1969 Dictator Fulgenico Batiste (Fidel Castro) fled the Island of Cuba, with his revolutionaries seizing control with the U.S backing the situation. This caused chaos and excitement in Havana, rumbling the idea of anti-americanism. This relates back to the conflict theory, as this had a great impact on the citizens of Cuba, causing more hate on america and its