The 501-25780 from Quantic Wenzel (Wenzel Associates, Inc.) is a OCXO with Frequency 10 - 600 MHz, Supply Voltage 15 V, Phase Noise -121 dBm/Hz@100 Hz to -103 dBm/Hz@10 Hz, Phase Noise 1 kHz -139 dBm/Hz, Phase Noise 10 kHz -158 dBm/Hz. Tags: Module with Connectors. More details for 501-25780 can be seen below.