What is the frequency of local oscillator?

The r.f. circuits and the local oscillator are all tuned by varactor diodes. The tuning range is from 470−860 MHz. At these frequencies, the circuit Q s are relatively low, with values of about 30 at 600 MHz.

What does a frequency oscillator do?

Oscillators convert direct current (DC) from a power supply to an alternating current (AC) signal. Oscillators are often characterized by the frequency of their output signal: A low-frequency oscillator (LFO) is an electronic oscillator that generates a frequency below approximately 20 Hz.

Why local oscillator is used in AM?

In an AM or FM receiver, a Local Oscillator (LO) is used to mix its frequency with the frequency of the station being received (tuned to or listened to).

What is the function of local oscillator in superheterodyne receiver?

The local oscillator excite a frequency for mixing with the incoming signal to get the intermediate frequency. Most radar receivers use megahertz intermediate frequency (IF) with a value between 30 and 75 megahertz. The IF is produced by mixing a local oscillator signal with the incoming signal.

How do you control the frequency of an oscillator?

By varying the total impedance of each oscillator oscillatory network, frequencies of oscillations are controlled using potentiometers. The main advantage of the proposed circuits is that both the amplitude and frequency of the waveforms generated can be independently controlled.

How does a local oscillator work?

In electronics, a local oscillator (LO) is an electronic oscillator used with a mixer to change the frequency of a signal. This frequency conversion process, also called heterodyning, produces the sum and difference frequencies from the frequency of the local oscillator and frequency of the input signal.

How do I reduce the frequency of an image?

Reception at the image frequency can be combated through tuning (filtering) at the antenna and RF stage of the superheterodyne receiver. For example, an AM broadcast station at 580 kHz is tuned on a receiver with a 455 kHz IF. The local oscillator is tuned to 580 + 455 = 1035 kHz.

What is the local oscillator frequency of the satellite with an uplink frequency in GHz band?

The local oscillator is at 2225 MHz to provide the appropriate shift in frequency from 6 GHz to 4GHz down conversion.

Does the local oscillator change the frequency of the incoming RF signal?

In reality it is not the local oscillator that changes the frequency of the incoming RF signal. This operation is performed by the mixer. Local oscillators and mixers are used in transmitters and receivers. A superheterodyne receiver is a good example of how local oscillator and mixer are used.

What is a local oscillator and how does it work?

In an AM or FM receiver, a Local Oscillator (LO) is used to mix its frequency with the frequency of the station being received (tuned to or listened to). When 2 different frequencies are mixed together, the result is 4 different frequencies; the 2 original frequencies, the sum of those 2 frequencies, and the difference between those 2 frequencies.

How do you tune an oscillator in a receiver?

You tune by setting the local oscillator to the desired signal frequency plus or minus the IF or intermediate frequency. Now in these digital days, we don’t “tune” , but simply select the signal frequency desired and the receiver circuits will determine and set the LO as required. Be a stronger writer this year.

What does it mean to process a signal at a frequency?

Processing a signal at a fixed frequency gives a radio receiver improved performance. In many receivers, the function of local oscillator and mixer is combined in one stage called a “converter” – this reduces the space, cost, and power consumption by combining both functions into one active device.

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