The 501-27515-23 from Quantic Wenzel (Wenzel Associates, Inc.) is a OCXO with Frequency 200 MHz, Supply Voltage 12 V, Phase Noise -113 dBm/Hz@100 Hz to -83 dBm/Hz@10 Hz, Phase Noise 1 kHz -143 dBm/Hz, Phase Noise 10 kHz -158 dBm/Hz. Tags: Module with Connectors. More details for 501-27515-23 can be seen below.