The 501-25472 from Quantic Wenzel (Wenzel Associates, Inc.) is a OCXO with Frequency 100 - 2000 MHz, Supply Voltage 15 V, Phase Noise -102 dBm/Hz@100 Hz to -72 dBm/Hz@10 Hz, Phase Noise 1 kHz -129 dBm/Hz, Phase Noise 10 kHz -147 dBm/Hz. Tags: Module with Connectors. More details for 501-25472 can be seen below.