The 501-26872b from Quantic Wenzel (Wenzel Associates, Inc.) is a OCXO with Frequency 100 - 500 MHz, Supply Voltage 15 V, Phase Noise -120 dBm/Hz@100 Hz to -85 dBm/Hz@10 Hz, Phase Noise 1 kHz -146 dBm/Hz, Phase Noise 10 kHz -170 dBm/Hz. Tags: Module with Connectors. More details for 501-26872b can be seen below.