Xicom XTD-500DBS 500W DBS-Band TWTA (Antenna Mount) 500 Watts DBS-Band (17.3 to 18.4 GHz) No Shelter Required Power Factor Correction High Efficiency Dual-Stage TWTs Xicom XTD-750DBS1 750W DBS-Band TWTA (Antenna Mount) 750 Watts DBS-Band (17.3 to 18.4 GHz) No Shelter Required High Efficiency Dual-Stage TWTs Complete RS-232/422/485 Interface Xicom XTRD-270DBS 270W DBS-Band TWTA (Rack Mount) 270 Watts DBS-Band (17.3 to 18.4 GHz) Power Factor Correction Digital Control Interface High Efficiency Xicom XTRD-500DBS 500W DBS-Band TWTA (Rack Mount) 500W DBS-Band (17.3 to 18.4 GHz) Compact 7" package Digital Display & Control Interface High Efficiency Xicom XTRD-750DBS 750W DBS-Band TWTA (Rack Mount) 750W DBS-Band (17.3 to 18.1 GHz) Compact 7" package Digital Display & Control Interface High Efficiency