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Frequency-shift keying#Audio FSK - memim.com
https://memim.com/frequency-shift-keyingaudio-fsk.html#:~:text=Audio%20Frequency%20Shift%20Keying%20%28AFSK%29%20is%20a%20digital,low%20frequency%20is%20called%20frequency%20shift%20keying.%20Method
FSK - FREQUENCY SHIFT KEYING
https://eng.auburn.edu/~troppel/courses/TIMS-manuals-r5/TIMS%20Experiment%20Manuals/Student_Text/Vol-D1/D1-07.pdf
These two frequencies may be in the audio range (front panel toggle switch LO), or in the 100 kHz range (front panel toggle switch HI). The frequencies f 1 and f 2 are set by the on-board variable resistors RV8 and RV7
Frequency Shift Keying (simple) - ocares.org
https://www.ocares.org/wp-content/uploads/2017/04/WhatIsFSK.pdf
Audio FSK Audio frequency-shift keying (AFSK) is a modulation technique by which digital data is represented by changes in the frequency (pitch) of an audio tone, yielding an encoded signal suitable for transmission via radio or telephone. Normally, the transmitted audio alternates between two tones: one, the "mark", represents a
Lab6 Part A- Audio Frequency Shift Keying (AFSK)
https://inst.eecs.berkeley.edu/~ee123/sp15/lab/lab6/Lab6-Part-A-Audio-Frequency-Shift-Keying.html
AFSK1200 encodes digital binary data at a data-rate of 1200b/s. It uses the frequencies 1200Hz and 2200Hz ( center frequency of $1700$Hz $\pm 500$ Hz) to encode the '0's and '1's (also known as space and mark) bits. Even though it has a relatively low bit-rate it is still the dominant standard for amature packet radio over VHF.
Lab5_Part_2-Audio_Frequency_Shift_Keying(AFSK)
https://inst.eecs.berkeley.edu/~ee123/sp17/lab/lab5/Lab5_Part_2-Audio_Frequency_Shift_Keying(AFSK).html
AFSK1200 encodes digital binary data at a data-rate of 1200b/s. It uses the frequencies 1200Hz and 2200Hz ( center frequency of $1700$Hz $\pm 500$ Hz) to encode the '0's and '1's (also known as space and mark) bits.
FSK: Signals and Demodulation
http://edge.rit.edu/content/P09141/public/FSK.pdf
simultaneous trans mission is called FDM. In the radio spectrum several audio FSK signals are often combined for transmission by a single -sideband transmitter. This form of FDM is often called Voice Fre quency Telegraph (VFT). To minimize bandwidth, t he individual FSK chan nels usually have “narrow” shifts of between 50 and 200 Hertz. A
MFSK Frequencies MFSK Frequency MFSK Channel
http://www.hflink.com/mfsk/
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