The 501-25784 from Quantic Wenzel (Wenzel Associates, Inc.) is a OCXO with Frequency 10 - 840 MHz, Supply Voltage 15 V, Phase Noise -118 dBm/Hz@100 Hz to -100 dBm/Hz@10 Hz, Phase Noise 1 kHz -135 dBm/Hz, Phase Noise 10 kHz -157 dBm/Hz. Tags: Module with Connectors. More details for 501-25784 can be seen below.