The 501-25789 from Quantic Wenzel (Wenzel Associates, Inc.) is a OCXO with Frequency 10 - 1920 MHz, Supply Voltage 15 V, Phase Noise -110 dBm/Hz@100 Hz to -92 dBm/Hz@10 Hz, Phase Noise 1 kHz -126 dBm/Hz, Phase Noise 10 kHz -148 dBm/Hz. Tags: Module with Connectors. More details for 501-25789 can be seen below.