What are the applications of FSK?

Following are the typical applications of FSK modulation. It is used on voice grade lines for data rates upto 1200 bps. It is used for high frequency radio transmission from 3 to 30 MHz. It is also used in coaxial cable based LAN (Local Area Network) at higher frequencies.

What is FSK modulator?

Frequency Shift Keying FSK is the digital modulation technique in which the frequency of the carrier signal varies according to the digital signal changes. FSK is a scheme of frequency modulation.

What is FSK modulation and demodulation?

Frequency-shift keying (FSK) is the frequency modulation system in which digital information is transmitted through the discrete frequency change of a carrier wave. The technology is used in communication systems such as amateur radio, caller ID, and urgent situation broadcasts. The simplest FSK is binary FSK (BFSK).

Which transistor is used in FSK?

It consists of a IC 555Timer which works in Astable Mode. Here ,transistor pnp act as a switch. The resistors R1 and R2and capacitor C determines the Frequency of the FSK modulated signal. The standard digital data input frequency is usually 150Hz.

What are the characteristics of FSK?

Frequency-shift-keying (FSK) signals with modulation index m = 0.5 have two significant properties. They have no discrete frequency components and nearly all the signal energy is contained within a narrow frequency region equal to \frac{3}{2} of the bit speed even without any band limiting.

Where is FSK modulation used?

Frequency-shift keying (FSK) is commonly used over telephone lines for caller ID (displaying callers’ numbers) and remote metering applications.

How is FSK generated?

FSK signals can be generated at baseband, and transmitted over telephone lines (for example). In this case, both f1 and f2 (of Figure 2) would be audio frequencies. Alternatively, this signal could be translated to a higher frequency. Yet again, it may be generated directly at ‘carrier’ frequencies.

How many frequencies are used in FSK?

four frequencies
The four frequencies allow the caller originator and the answering modem to communicate at the same time; that is, full-duplex communication. FSK modems are inefficient in their use of bandwidth, with the result that the maximum data rate over normal telephone lines is 1800 bps.

What is spectrum of FSK?

The FSK spectrum is the consolidation of two ASK spectra centred around The bandwidth needed for FSK transmission is similar to the band rate of the signal plus the frequency change (the difference between the two carrier frequencies) − BW=(fc1−fc0)+Nband .