The 501-27273 from Quantic Wenzel (Wenzel Associates, Inc.) is a OCXO with Frequency 100 MHz, Supply Voltage 15 V, Output Power 13 dBm, Phase Noise -160 to -100 dBc/Hz, Phase Noise 1 kHz -130 dBc/Hz. Tags: Module with Connectors. More details for 501-27273 can be seen below.