vastuvõtuahel

Vastuvõtuahel is an Estonian term that translates to "receiver chain" or "reception circuit" in English. It refers to the series of electronic components in a radio receiver responsible for detecting, amplifying, and processing an incoming radio signal. The primary function of a vastuvõtuahel is to convert weak radio waves into a usable form, such as audio or digital data.

The typical vastuvõtuahel begins with an antenna, which captures the electromagnetic waves. This signal is then passed through a tuned circuit, often involving inductors and capacitors, to select the desired frequency and reject unwanted ones. Following frequency selection, the signal is usually amplified by one or more radio frequency (RF) amplifier stages. This amplification is crucial because the incoming signals are often very weak.

After amplification, the signal is typically demodulated. This process extracts the information (like audio) that was modulated onto the carrier wave. Different demodulation techniques exist depending on the type of modulation used (e.g., amplitude modulation - AM, frequency modulation - FM). Finally, the demodulated signal may undergo further amplification in an audio frequency (AF) amplifier before being outputted to a speaker or other display device. Modern vastuvõtuahel circuits are often integrated into complex semiconductor chips, performing many of these functions with high efficiency and precision. The design of a vastuvõtuahel is critical for determining a receiver's sensitivity, selectivity, and overall performance.