The NX1501R from Narda-ATM is a Noise Source with Frequency 10 to 150 MHz, Excess Noise Ratio (ENR) 15.5 dB, Flatness ±1.0 dB, Temperature Coefficient 0.01 dB/Degree C, Voltage Coefficient 0.1 dB/%V. Tags: Module with Connectors. More details for NX1501R can be seen below.