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Sounds & spectra - Nonstop Systems
https://www.nonstopsystems.com/radio/radio-sounds.html
NOTES: Frequency-shift keying (FSK) shifts between two known states. Phase-shift keying (PSK) changes PHASE of a signal against some reference. FSK is sent by either shifting a carrier frequency (F1B) or modulating SSB with two shifting audio tones (AFSK). When sending PSK, a complex audio waveform is transmitted by SSB.
Audio frequency shift keying - zxc.wiki
https://de.zxc.wiki/wiki/Audio_Frequency_Shift_Keying
Audio Frequency Shift Keying ( AFSK) is a digital modulation type, which on the Frequency Shift based (FSK), and as a special feature as a modulating signal frequencies in the low frequency range used (NF, 16 Hz to 20 kHz). In German, the process is also known as low frequency keying or low frequency frequency keying.
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
Lab 6, Digital Communication with Audio Frequency Shift Keying (AFSK)¶ In this part of the lab we are going to experiment with Digital modulation and communication. Network Communication systems have layered architechture. The bottom layer is …
Radio Teletype (RTTY) - Signal Identification Wiki
https://www.sigidwiki.com/wiki/Radio_Teletype_(RTTY)
Audio Sample: RTTY Radio TeleTYpe (Also known as Baudot or ITA2) uses the Baudot 5-bit alphabet with FSK Frequency-Shift Keying to send text messages over the shortwave. This mode is gradually dying out in favor of more robust modes like PSK31 in the amateur service. Uses the ITA-2 alphabet (Commonly known as Baudot, derived from the Murray code).
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
Lab 5 Part 2: Digital Communication with Audio Frequency Shift Keying (AFSK)¶ In this part of the lab we are going to experiment with digital modulation and communication. Network Communication systems have layered architecture: The bottom layer is the physical which implements the modulation.
Digital Modes - hfradio.org.uk
https://hfradio.org.uk/html/digital_modes.html
FT8 & FT4 (F ranke-T aylor design, 8 (4) FSK modulation). FT8 Audio Samples (Click on desired format): ogg - mp3 - wav FT4 Audio Samples (Click on desired format): ogg - mp3 - wav 2017 saw the birth and meteoric rise in popularity of a new mode called FT8.
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