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PSK31 - G4ILO
http://www.g4ilo.com/psk31.html
PSK31 PSK31 is a method of communicating by sending data over radio which was developed by Peter Martinez, G3PLX. It uses a very narrow band, phase modulated signal and special data encoding, to allow operators to "chat" in a manner similar to RTTY.
PIC-based PSK31 Transmitter - Version 2.0x user's guide
http://www.ka7oei.com/psk_ver2x_guide.html
Version 2.0x PIC-based PSK31 Transmitter user's guide. If you are building your own interface, you should realize that RS-232 data is, by definition, inverted - that is, a "0" is a "1" and vice-versa. This is a result of the fact that RS-232 drivers, as defined in the standard, invert the logic level applied to them.
Technical description of a PIC-based PSK31 MedFer Beacon
http://www.ka7oei.com/psk_transmitter.html
The first PSK31 transmitter prototype did not have any amplitude modulation: The "Data Output" (varicode) bit was simply applied to one input of an XOR gate, the RF carrier was applied to another, and a receiver was coupled to the gate's output. The result of this is a PSK31 signal - but a very dirty one! Using this method every time the phase ...
PSK31 Setup and Operation - bpsk31.com
https://bpsk31.com/operation/
PSK31 Setup and Operation Setup A basic PSK31 station should consist of the following components: HF SSB Transceiver Soundcard-equipped PC Antenna PSK31 Software (optional) Soundcard Interface Transceiver / Antenna Virtually any SSB transceiver will do. The same is true of the antenna, as PSk31 will function with a few watts and a wire antenna.
A UNIVERSAL DIRECT CONVERSION RECEIVER FOR PSK-31
https://www.nutsvolts.com/uploads/magazine_downloads/A_Universal_Direct_Conversion_Receiver_For_PSK-31.pdf
This receiver is called a “universal” DC PSK-31 receiver because with an appropriate choice of crystals X1–X3 and capacitors C1, C2, and C4–C6, it will receive PSK-31 signals on any of the frequencies listed in Table 1. Table 1 also lists component values for four frequencies corresponding to the frequencies where crystals are
What is PSK31 - N3UJJ
http://n3ujj.com/manuals/What%20is%20PSK31.pdf
The PSK31 receiver overcomes this by filtering the receive signal, or by what amounts to the same thing, shaping the envelope of the received bit. The shape is more complex than the cosine shape used in the transmitter: if we used a cosine in the receiver we end up with some signal from one received bit "spreading" into the next bit, an inevitable
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