This website uses cookies to ensure you have the best experience. Learn more

Am Vs Fm Radio Essay

1118 words - 5 pages

In modern society, radio is the most widely used medium of broadcasting and electronic communication. Radio can be broadcasted with both microwaves and longer radio waves. These are transmitted in two ways: amplitude modulation (AM) and frequency modulation (FM). Amplitude radio is created by combining a sound wave from a microphone, tape, record, or CD with a "carrier" radio wave. This results in a wave that transmits voice or programming as its amplitude (intensity) increases and decreases. Frequency modulation conveys information, voice, and music on a radio wave is to slightly change, or modulate, the frequency. One big advantage of frequency modulation is that it is static free.
AM ...view middle of the document...

FM signals are line-of-sight. This means that FM stations don't interfere with each other, this characteristic creates a couple of other problems.
Firstly due to these waves are they go in a straight line and don't bend around the earth as AM ground waves do. Thus, they can quickly disappear into space. This means the further you are away from the FM station the higher you have to have the antenna to receive a signal. Due to the fact that the earth is round these waves will disappear after 75 miles or so. Secondly since FM signals are line of sight they can be stopped or reflected by things like mountains and buildings.
Frequency modulation station can generally reach its audience anywhere from 24km up to 105km away. Due to the frequency of the carrier wave is modulated thus reducing the background noise. For FM the frequency of the carrier wave varies according to the strength of the audio signal or program. Unlike AM, where the strength of the carrier wave varies, the strength of the carrier wave in FM remains the same, while its frequency varies above or below a central value broadcast. FM transmission have broadcast waves of (88-108 MHZ) which are shorter than AM broadcast waves (540 - 1600 kHz) and do not go as far.
For AM the amplitude of the carrier waves varies to match changes in the electromagnetic waves coming from the radio studio. Amplitude modulation stations can with powerful transmitters can reach listeners as far as 1600 km away. Although AM waves can be received at greater distances than FM, FM are not affected by static as much as Am waves. Static is caused by electricity in the atmosphere. In addition FM waves also result in a truer reproduction of sound than AM waves.
HETERODYNE PRINCIPLE
Heterodyning is process in which an electromagnetic carrier wave which is carrying a signal by means of amplitude modulation or frequency modulation can transfer that signal to a carrier of different frequency. It is accomplished by mixing the original modulated carrier with a sine wave of another frequency. A beat frequency is produced from this which is equal to the difference between the frequencies, and this difference frequency constitutes a third carrier which will be modulated by the original signal.


AM Transmitor
Amplitude modulation is modualted in a stage called the modulator. Two signals enter it: high...

Find Another Essay On AM Vs FM Radio

FM Radio: The Rise and Fall of the Radio DJ?

1194 words - 5 pages that includes a mix ranging from the Beatles to Norah Jones to the Strokes. Fonda writes: “If you can't bear another spin of Britney Spears, you're one of the reasons that stations like Radioparadise are beginning to prosper and investors are again flocking to another alternative to the AM/FM dial: satellite radio.” (Fonda). This is why I personally prefer to listen to either live-streaming radio from other countries or internet radio like

Radio Advertising Essay

10275 words - 41 pages fm (frequency modulated) radio can tune in to that specific frequency and give you clear reception of that station. All fm radio stations transmit in a band of frequencies between 88 megahertz and 108 megahertz. This band of the radio spectrum is used for no other purpose but fm radio broadcasts.Common frequency band includes the following…•AM radio - 535 kilohertz to 1.7 megahertz•FM radio - 88 megahertz to 108 megahertzAM radio

Future Of Radio Broadcasting

2418 words - 10 pages allotment planning for AM and FM existing stations, priority to available spectrum, regulation of digital radio transmission facilities, and a recommendation that additional L-Band spectrum be allocated.Digital Radio can play an important role on the Information Highway. In the report, the Task Force describes how it sees digital radio as integral to the Information Highway, particularly in its ability to deliver services to any location, whether it be

Birth of the BBC

1963 words - 8 pages , and today some music and a great deal of speech radio, which does not necessarily demand high-quality reception, is still found on the AM dial. FM works by varying the frequency of the carrier wave within a narrowly fixed range at a rate corresponding to the frequency of a sound signal. It is used within the VHF band, so that the terms "VHF" and "FM" have become synonymous for most radio listeners. FM reaches only

New Zealand Broadcasting And Radio History

4039 words - 16 pages bought and small stations (particularly fm) were started. With this "˜Boom' period, "people suddenly realised that you had to think smarter, cheaper and change quickly to operate cost effectively to survive" (Mike Regal, 12/3 lecture). As some stations failed, other radio entrepreneurs who had done well decided that they were able to have a go at another station. Stations began to aim at smaller markets, otherwise called niche markets. The

History of Radio

2055 words - 8 pages NBC blue for $8 million in 1945 (Ditingo 20). In the 1930s Edwin H. Armstrong experiments with FM (frequency modulation) radio which offers greater clarity than AM radio. In 1940 the FCC authorizes the first FM radio stations. FM radio became popular in the 1960s when radio format changed (Soley 39). A final very important technological development was the transistor in 1947. It wasn’t until the 1960s the transistor became a popular “pocket radio

Radios, and how they work

3090 words - 12 pages sound waves. Prior to 1937 this modulation was done by changing the amplitude, or magnitude, of the radio waves, a process known as amplitude modulation (AM). In 1933, Armstrong discovered how to convey the sound on the radio waves by changing or modulating the frequency of the carrier radio waves, a process known as frequency modulation (FM). This system reduces the effects of artificial noise and natural interference caused by atmospheric

Radio

525 words - 2 pages Radio Radio becomes Americas second national mass medium after magazines -     99% of American’s homes have radios -     95% of American’s cars have radios -     40% of Americans listen to the radio between 6 am and midnight -     7% of Americas bathrooms have radios in them Radio: A technological Leap 1835 Samuel F. B. Morse demonstrates his

Empire of the Air: Invention of the Radio

1375 words - 6 pages , Charles Lindbergh returned to America from Europe and NBC linked 50 stations to broadcast the event live (1). In 1927, Sarnoff became the president of the RCA, one of the largest companies in America at the time (F). Armstrong introduced Frequency Modulation (FM) radio in 1933; it was a huge improvement over AM radio, as it was not nearly as affected by interference and it could broadcast the full range of human hearing (F). However, as so many AM

How the Radio Affected Americans

1528 words - 7 pages not necessary. AM radio does not have as good of quality as FM but it can travel farther distances. FM signals can be interfered by things such as mountains or other barrier Richmond 3 (madehow.com). Many radios were made for different situations such as to be in a home or to be built to resist damage during war time. There are many different types of radios that have various uses. The Crystal radio was the first radio product to be sold. It

Communication Technologies in Canada

1403 words - 6 pages broadcasting company is Rogers Media-Broadcasting".7 Some of the stations they own are 680 NEWS (CFTR-AM 680), CHFI-FM (98.1), KISS FM (92.5), CKBY-FM (105.3), OCEAN FM (CIOC FM 98.5), NEWS1130 (CKWX AM 1130), XFM (CKVX FM 104.9), and CJIB-AM (940). A very diverse range of stations, catering to almost all Canadians, making the Radio arm of Rogers unique in itself. Radio broadcasting in Canada is unique itself. Minimum of the music played on Canadian

Similar Essays

Differences In Radio Am And Fm

962 words - 4 pages waves. These are transmitted in two ways: amplitude modulation (AM ) and frequency modulation ( FM ). These two kinds of wave have many differences. Radio waves are among the many types of electromagnetic waves that travel within the electromagnetic spectrum. Radio waves can be defined by their frequency (in hertz, after Heinich Hertz , who first produced radio waves electronically), which is number of times they pass through a complete

Product And Promotion Of Crhk Essay

1228 words - 5 pages tangible product. As a radio station, their actual products definitely are the channels, radio programmes and DJs. There are three channel frequencies such as FM 881, FM 903 and AM 864. Yet, the radio programmes are mainly provided in FM and clearly targeted to different levels of audience. - Market segmentation and Positioning In order to responses the targeted market’s desires., the positioning of programme contents of FM 881 are in professional

Satellite Radio: Xm Versus Sirius (Case Summary)

925 words - 4 pages competitors is the competition with tall free radio (FM AM); Internet radio; satellite TV and cable systems, who provided radio services as part as their digital package for free. It is difficult to persuade a regular listener to purchase a service, which is already provided for free in good quality.A major problem for Sirius was the broadcasting delay for 2 years due to technical problems. Sirius started broadcasting 9 months later then XM started to

Marketing Plan Essay

592 words - 2 pages Marketing Plan PAGE 1 Marketing Plan: Phase ILeslie StacksMGTUniversity of PhoenixKen LeCourAugust 8, 2007Marketing PlanSatellite Radio is the newest way for people to tune in to their favorite songs. With the music coming direct from the satellite to the receiver, there have been a multitude of advantages over regular AM/FM radio. XM has been a satellite radio provider since 1992. XM offers listeners continuous, commercial free music of their