The links:

"Learn Telecommunications by Simulation" by Jeremy VE3PKC http://www.clarktelecommunications.com/

All you want to know about PSK31: www.bpsk31.com

For italian fans of digimodes and Multipsk mirror site: I6KZR

PSK31 para principiantes, casi todo en PSK31: EA4ZB

RADIOAFICION,SATELITES,DX,APRS,SOFTWARE,FOTOS...EA1URO

All about Hellschreiber: F/N4SPP

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This page has been written the 14th of March 2019.