AMPLITUDE MODULATION -(next part-1)

Firstly, let's have a look at what radio transmission is really all about.  It’s fine to have a microphone  to speak into and expect to be  heard somewhere  else in the world, however what are the  real  principles involved. This does not apply just to amplitude modulation but to all types of modulation.
Modulation - in radio communications means combining signals, one of which is  normally the  information we want to transmit  (which is usually  a  low  frequency  such  as  audio  orvoice),  with  a  radio frequency
              Radio communication uses the ability of an electromagnetic wave (or if you like electromagnetic energy) to transfer information from one point to another.It is very easy to create anelectromagnetic wave, send this wave to an antenna, and have this wave propagate over a long distance at the speed of light.It's another matter to have the electromagnetic wave contain useful information such as voice, or some other form of intelligence, which after all is the main objective of radio communication.

Remember that electromagnetic radiation takes many forms.  Light is electromagnetic radiation.The infrared  signal from your TV  remote control is electromagnetic radiation.The heat given off by a bar radiator is  electromagnetic radiation.The whole secret of radio
communication  is to place information  onto the signal,  to convey intelligence or a message from one point to another. ............
              

 

Amplitude Modulation

       We're going to be talking about amplitude modulation.This is the first time we will be discussing how radio is used to transfer information across a long-distance in virtually no time at all. Therefore, it is my intention to cover the concepts completely without the use of unnecessary mathematics. Please do not think that ""without all of the mathematics we are shortchanging the subject"". 
       I studied under many faculties, who have come straight out of university, and when I have asked them about amplitude modulation they reel off a whole set of "MATHEMATICAL EQUATIONS"(i jst HATE it....) in an attempt to explain it. However, when I have asked what it really is?????....

      I have often received a blank look for an answer. :(.... Mathematics alone does not always explain everything in such a way that you really get a feel for the subject.  I hope that during this reading you will really gain an understanding of what radio transmission and amplitude modulation is really all about.  The reading may be verboseand repetitive, bUt this iZ dONe to hELp U unDeRstanD the ImpORTant ReAL cOncEptS.......hAve a gUd dAy.....:):)

What is 8051 Standard?

Microcontroller manufacturers have been competing for a long time for attracting choosy customers and every couple of days a new chip with a higher operating frequency, more memory and upgraded A/D converters appeared on the market.

However, most of them had the same or at least very similar architecture known in the world of microcontrollers as “8051 compatible”. What is all this about?

The whole story has its beginnings in the far 80s when Intel launched the first series of microcontrollers called the MCS 051. Even though these microcontrollers had quite modest features in comparison to the new ones, they conquered the world very soon and became a standard for what nowadays is called the microcontroller.
The main reason for their great success and popularity is a skillfully chosen configuration which satisfies different needs of a large number of users allowing at the same time constant expansions (refers to the new types of microcontrollers). Besides, the software has been developed in great extend in the meantime, and it simply was not profitable to change anything in the microcontroller’s basic core. This is the reason for having a great number of various microcontrollers which basically are solely upgraded versions of the 8051 family. What makes this microcontroller so special and universal so that almost all manufacturers all over the world manufacture it today under different name?

As seen in figure above, the 8051 microcontroller has nothing impressive in appearance:

• 4 Kb of ROM is not much at all.
• 128b of RAM (including SFRs) satisfies the user's basic needs.
• 4 ports having in total of 32 input/output lines are in most cases sufficient to make all necessary connections to peripheral environment.

The whole configuration is obviously thought of as to satisfy the needs of most programmers working on development of automation devices. One of its advantages is that nothing is missing and nothing is too much. In other words, it is created exactly in accordance to the average user‘s taste and needs. Another advantages are RAM organization, the operation of Central Processor Unit (CPU) and ports which completely use all recourses and enable further upgrade.

First Blog :)

Hi,
This is my first blog. Let's see how far I reach.