The 3117-3338-720 from Cross Technologies is a Block Up/Down Converter with Input Upconverter Frequency 720 MHz, Input Downconverter Frequency 3.8 GHz, Output Upconverter Frequency 3.3 GHz, Output Downconverter Frequency 720 MHz, Gain 0 to 20 dB. Tags: Rack Mount. More details for 3117-3338-720 can be seen below.