The scalable Drake Digital EH24 encoder features six bays fitting any combination of SDE24 and HDE24 modules, all within in a 2 rack unit (RU) chassis. The EH24 system can encode up to 12 analog video inputs when fully populated with six SDE24 encoder modules. The EH24 can multiplex encoded video streams and output them via an integrated 1GHz QAM modulator and/or an integrated DVB-ASI port, to transmit digital video over network. The sophisticated transport stream multiplexer can combine any or all of program streams from encoder modules. The operator may select what programs to include in QAM output channel and independent of QAM output, what programs to output via DVB-ASI port. The QAM RF output can be specified for either off-air or CATV frequency plans in 54 to 1002MHz spectrum. The EH24 and installed encoder modules are powered by a highly efficient and integrated switching power supply.