11. Radar detectors are built around a superheterodyne receiver, which has a local oscillator that radiates slightly. 12. In this application, the transistor is made to self-oscillate at the local oscillator frequency. 13. The UDOP ground receivers are double, superheterodyne, dual-channel units with common local oscillators . 14. The addition of a beacon local oscillator wave meter permitted the determination of spacecraft-transmitter frequency drift. 15. In intelligence operations, local oscillator radiation gives a means to detect a covert receiver and its operating frequency. 16. The local oscillator frequency determines what block of incoming frequencies is downconverted to the frequencies expected by the receiver. 17. Modern radio tuners use a superheterodyne receiver with tuning selected by adjustment of the frequency of a local oscillator . 18. A single transistor combines the functions of amplifier, mixer and local oscillator of an otherwise conventional superheterodyne receiver. 19. The receiver was a super-heterodyne type with a low-power magnetron serving as the local oscillator . 20. There are two choices for the local oscillator frequency because the dominant mixer products are at " f"
