This outdoor antenna-mounted block upconverter is designed to cover multiple wide-bandwidth satellite transponders by accepting four independent IF inputs that are upconverted to one wideband RF output. It has multiple remote monitor and control functions, and a contact-closure summary alarm is provided for fault monitoring. A continuously updated log of time-stamped records of activity is also provided. The upconverter is housed in a weather-resistant enclosure, has automatic 5 or 10 MHz internal or external reference selection, and 10/100 Base-T Ethernet and RS-485/RS-422 remote control. Phase noise is below the IESS-308/309 specification and there is 30 dB of gain control, 32 memory locations, and a redundant AC power supply with power factor correction. Options include higher stability, reduced spurious content, and lower phase noise.