What is RUDAK?
RUDAK stands for Regenerativer Umsetzer fur Digitale Amateur-Kommunikation. (in English: Regenerating Transponder for Digital Amateur Communications). But as implemented in AO-40 it is much more than a regenerating repeater. It is a pair of fully programmable computers each of which has its own error corrected memory and associated hardware modems and DSP modems. It also controls many of the experiments on AO-40 including the GPS, the SCOPE cameras, two sets of temperature telemetry nodes, the MONITOR HF passive sounding experiment, and the CEDEX radiation experiment. There are other connections as well including to the CAN bus, the IHU, and a direct link between the two RUDAK processors. The hardware consists of two mostly independent units, each with: V53 CPU running SCOS, 16 megabytes ECC RAM, 10 SCC channels, (8 with DMA support), two 9k6 hardwired G3RUH modems, one 153k6 hardwired BPSK modem, 4 DSP modulators, 4 DSP demodulators, CAN bus interface, and a FIFO buffer between the CP
