The R1U-6.1-INV from GeoSync Microwave is a Block Upconverter with AC Voltage 90 to 250 VAC, Gain 33 dB, Image Rejection 60 dB, Impedance 50 Ohms, Input Frequency 950 MHz to 1.525 GHz. Tags: Rack Mount. More details for R1U-6.1-INV can be seen below.