MODULATION

At the transmitter, there are several components necessary to be able to transmit information, one of which is a modulator, the modulator is a tool to perform modulation.  Interpreted as a mixing signal modulation and signal information carier, but a little confusing here is why should the mix? and why is mixed with another signal called signal carier? well then what's carier signal? some of these things we will discuss in this article.

Why the signal must be mixed with carier signal?

• which is to be expected from transmitting transmitting range can be as far - away, to be able to emit such a shift, we perform frequency, with frequencies shift to the higher frequency range of the signal is also farther away in accordance with the equation λ =, λ = wavelength.
• rest result from this frequency shift was also influenced by the size of transmitting antenna, satellite dish, antenna diameter will correspond to the wavelength, the diameter parabolic antenna will be in accordance with the equation λ = ¼ d, d = diameter of antenna
•   Viewed advantage of this modulation can also be the basis of the MUX (multiplexing), multiplexing is the process of combining several channels to save the channel.
• Modulation is also needed if we want a data transfer by radiation, because one of the requirements can be transmitted is first in the modulation signal terlebihh
• With the modulation process, as well as reduce the influence of the noise that arises, is the interference noise arising from several causes, for the noise will also be discussed further in the next article 

Why should signal carier?
Carier signal can be likened such as trucks and likened to such information goods transported by truck, carier signal will carry the signal information, more precise information signal superimposed on carier signal, because that's signal required carier.
Actually whether it carier signal?
Carier signal is a signal that has a certain frequency, with greater provision of information signal, why should larger, same as above, a truck must be greater than he brought the items to be, if it already can you imagine, that need to be considered is carier signal not the signal information
There are two types of modulation, namely:

• Analog modulation
• Digital modulation

Analog modulation

• PCM
• DPCM
• ADPCM
• Delta Modulation

Digital modulation

• ASK (Amplitude Shift Keying)
• PSK (Phase Keying SIFT)
• QPSK (Quadrate Phase Keying SIFT)
• FSK (Frequency Shift Keying)

  EXPLANATION OF THE FORM OF MODULATION will be explained BACK IN THE NEXT CHAPTER