Oven-controlled crystal oscillator often used in navigation system clocks, frequency standards, MTI radars, wireless base stations, telecom timing modules and precision test equipment.
                                                            
                                                     
                        
                                                
                        
                        
                            an XO with the ability to enhance stability by heating the crystal to a specified temperature
                                                            
                                                     
                        
                                                
                        
                        
                            Oven controlled crystal oscillator. A crystal oscillator maintained, during operation, at a fixed temperature so that frequency changes due to ambient temperature changes do not affect its performance.