How does a superheterodyne radio work?

How does a superheterodyne radio work?

How does a superheterodyne radio work?

The superheterodyne receiver operates by taking the signal on the incoming frequency, mixing it with a variable frequency locally generated signal to convert it down to a frequency where it can pass through a high performance fixed frequency filter before being demodulated to extract the required modulation or signal.

What device is used to tune a superheterodyne receiver?

RF amplifier
The RF amplifier is one of the key areas of any superheterodyne radio receiver and its performance can govern many aspects of the performance of the receiver as a whole.

What is the principle of superheterodyne receiver?

The superheterodyne receiver is the most common configuration for radio communication. Its basic principle of operation is the translation of all received channels to an intermediate frequency (IF) band where the weak input signal is amplified before being applied to a detector.

Why if is 455 kHz?

Uses. Perhaps the most commonly used intermediate frequencies for broadcast receivers are around 455 kHz for AM receivers and 10.7 MHz for FM receivers. A first intermediate frequency may even be higher than the input signal, so that all undesired responses can be easily filtered out by a fixed-tuned RF stage.

What are the disadvantages of tuned radio frequency receiver?

Keeping several tuned circuits aligned is difficult. The bandwidth of a tuned circuit doesn’t remain constant and increases with the frequency increase. Instability due to large number of RF stages. Gain is non-uniform over a wide range of frequencies.

Why superheterodyne receivers are preferred over the tuned radio frequency receiver?

Achieving constant sensitivity and bandwidth across an entire broadcast band was rarely achieved. In contrast, a superheterodyne receiver translates the incoming high radio frequency to a lower intermediate frequency which does not change. All the tuned circuits need to track to keep the narrow bandwidth tuning.

How does a superheterodyne radio receiver work?

A superheterodyne receiver uses signal mixing to convert the input radio signal into a steady intermediate frequency (IF) that can be worked with more easily than the original radio signal that has a different frequency, depending on the broadcasting station.

Where did the idea of the superheterodyne come from?

The story of the development and RF circuit design technology of the superheterodyne radio receiver can be traced back to the earliest days of radio. Reginald Fessenden noticed that signals on adjacent wavelengths created a beat note together.

Can a superheterodyne be tuned to a single frequency?

For instance, to receive a signal at 1300 kHz, one could tune the LO to 1360 kHz, resulting in the same 60 kHz IF. This means the amplifier section can be tuned to operate at a single frequency]

Where is the capacitor in a superheterodyne AM receiver?

Together with the bigger one it comprises the HF transformer that takes the signal from the oscillatory circuit into the next stage of the receiver. Both the coil and the capacitor C are placed in the square-shaped metal housing that measures 10x10x11 mm (Pic.4.3-b).