While Winlink can use the Pactor protocol, it is not required to use the system. Winlink is capable of using multiple protocols each of which fit to frequency,

While Winlink can use the Pactor protocol, it is not required to use the system. Winlink is capable of using multiple protocols each of which fit to frequency, hardware and band conditions. https://en.wikipedia.org/wiki/Winlink#Technical_protocols https://en.wikipedia.org/wiki/Winlink#Technical_protocols