The 501-26689 from Quantic Wenzel (Wenzel Associates, Inc.) is a OCXO with Frequency 80 - 320 MHz, Supply Voltage 15 V, Phase Noise -118 dBm/Hz@100 Hz to -88 dBm/Hz@10 Hz, Phase Noise 1 kHz -143 dBm/Hz, Phase Noise 10 kHz -161 dBm/Hz. Tags: Module with Connectors, Low G-Sensitivity. More details for 501-26689 can be seen below.