The PE85NS4004 from Pasternack Enterprises Inc is a Noise Source with Frequency 0.2 MHz to 3 GHz, Excess Noise Ratio (ENR) 51 dB, Flatness ±2 dB, Temperature Coefficient 0.01dB/Degree C, Voltage 12 V. Tags: Surface Mount. More details for PE85NS4004 can be seen below.