A local oscillator (LO) is an oscillator used in RF transmitting and receiving equipment. The frequencies generated with it are mixed with the received frequencies in a mixer to obtain new, lower frequencies, the intermediate frequencies, which can be better processed in terms of circuitry.
To avoid frequency fluctuations and the phase noise of local oscillators, they are coupled via a phase-locked loop( PLL) to voltage- and temperature-stabilized oscillators such as the voltage-controlled oscillator( VCO), oven-controlled crystal oscillator( OCXO) or temperature-compensated crystal oscillator( TCXO). Local oscillators are found in all RF receiver stages; in receivers or tuners, in televisions, radios, and radios.
As an example, the local oscillator for the LNB converter uses its frequency to mix with the input signal. This frequency mixing serves to convert the high-frequency microwaves, which lie in the reception range between 10.70 GHz and 12.70 GHz, into the lower intermediate frequency in the range 950 MHz and 2.150 GHz.