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). BFSK uses a pair of discrete frequencies to transmit binary (0s and 1s) information. With this scheme, the “1” is called the mark frequency and the “0” is called the space frequency.
‪@ProfMadhukarWalunj‬
Important
1. I mentioned sine waves in the FSK signal, but this circuit don't give sine wave output. Output is square wave, for sine wave go for VCO
2. In explanation, I told that, the transistor turns ON when you applied '1' level to the base of transistor. It is not correct. Transistor turns ON when the '0' signal is applied to the base of transistor.
Please make correctio at your side
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#MarkandSpaceFrequency
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