This high performance outdoor block downconverter is intended for use in professional applications in X-band such as satellite earth stations. The BMCD175 includes a single conversion downconverter stage with appropiate filtering, a low phase noise local oscillator, a microprocessor based monitor and control circuitry, and power supply. It is operated from AC power supply. BMCD175 can be controlled via RS422/RS485 or Ethernet. External reference has dedicated connector. This downconverter is housed in an outdoor IP67 rated cabinet. The IF output is equipped with a diplexer that can combine the 1800-2100MHz IF output of the downconverter with a standard S-band downlink signal (2200-2300MHz).