The 501-27514-13 from Quantic Wenzel (Wenzel Associates, Inc.) is a OCXO with Frequency 100 MHz, Supply Voltage 15 V, Phase Noise -130 dBm/Hz@100 Hz to -100 dBm/Hz@10 Hz, Phase Noise 1 kHz -155 dBm/Hz, Phase Noise 10 kHz -167 dBm/Hz. Tags: Module with Connectors, Thru-Hole. More details for 501-27514-13 can be seen below.