The O-ESQ-XXXYY-EX-A-X-500 MHz from NEL Frequency Controls is a OCXO with Frequency 500 MHz, Supply Voltage 4.9 to 11 V, Output Power 10 to 15 dBm, Output Load 50 Ohms, Phase Noise -174 to -97 dBc/Hz. Tags: Module with Connectors, Low Phase Noise, Low G-Sensitivity. More details for O-ESQ-XXXYY-EX-A-X-500 MHz can be seen below.