The 50D-051 from JFW Industries is a RF Detector with Frequency 1 to 2000 MHz, Max Input Power 20 dBm, Frequency Flatness ±0.3 dB, Voltage Sensitivity 220 mV/mW, VSWR 1.20:1, 1.30:1. Tags: Connectorized, Diode Detector. More details for 50D-051 can be seen below.