The PE85NS4000 from Pasternack Enterprises Inc is a Noise Source with Frequency 0.2 to 500 MHz, Excess Noise Ratio (ENR) 31 dB, Flatness ±0.5 dB, Temperature Coefficient 0.01dB/Degree C, Voltage 12 V. Tags: Surface Mount. More details for PE85NS4000 can be seen below.