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www.BUXCOMM.com PSK31
http://radiomanual.info/schemi/ACC_packet/PSK31_handbook_2000.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
A UNIVERSAL DIRECT CONVERSION RECEIVER FOR PSK-31
https://www.nutsvolts.com/uploads/magazine_downloads/A_Universal_Direct_Conversion_Receiver_For_PSK-31.pdf
The Receiver Figure 1presents the schematic for the DC receiver. Direct conversion receivers function by directly converting the desired RF signal to an audio frequency. This approach results in a relatively sensitive receiver that requires a minimum number of components. Again referring to Figure 1, capacitors C1, C2, along with
PSK31 Setup and Operation | bpsk31.com
https://bpsk31.com/operation/
PSK31 software will output audio to the PC's soundcard to send a transmission, however a mechanism must exits for keying the radio to transmit an RF signal, as well as link the audio tone to the radio's audio input. Therefore some form of soundcard interface may be used. It might simply be an audio cable with a radio with VOX capabilities, or ...
PSK31 - G4ILO
http://www.g4ilo.com/psk31.html
Most PSK31 operators use PC software that generates and decodes the audio PSK signal using the computer sound card. The output from the radio receiver is fed into the sound card's line input socket and the software decodes it and displays the text on the screen.
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
A alternative PSK31 transceiver
http://www.waarsenburg.com/index.php/the-news/57-a-alternative-psk31-transceiver
A computer was connected to the audio input, and a dummyload was connected to the transceiver´s output. It did produce a rumble in the receiver, but nothing readable on the screen. Checking with the scope showed that the squarer did not work, and hence the phase flipflop produced no output either.
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