Here is an excellent resource with all current documentation about the AMSAT PACSAT Broadcast Protocol and Ground Station Software (Client) from G0KLA: https://www.g0kla.com/pacsat/
Does anyone know an open source implementation for the PACSAT Server?
Yes CHRISTOPHER E THOMPSON developed a new PACSAT software, (Pacsat Ground Station Software)
Christopher also works on FoxTelem - AMSAT Ground Station Software. if somebody know / inform the OM, he may help.!!!