The BEM-2A-250 from Crane Aerospace & Electronics is a Modulator with RF Frequency 2 to 500 MHz, Voltage -5.2 V, Carrier Suppression -40 dBc, Insertion Loss 2.5 to 3.5 dB, Amplitude Balance 0.10 to 0.3 dB. Tags: Module with Connectors. More details for BEM-2A-250 can be seen below.