The 501-28133 from Quantic Wenzel (Wenzel Associates, Inc.) is a OCXO with Frequency 100 - 1000 MHz, Supply Voltage 15 V, Phase Noise -113 dBm/Hz@100 Hz to -78 dBm/Hz@10 Hz, Phase Noise 1 kHz -139 dBm/Hz, Phase Noise 10 kHz -163 dBm/Hz. Tags: Module with Connectors. More details for 501-28133 can be seen below.