Question

What Is The Capture Effect And What Causes It?

Answer 1

General Electric employees performing test transmissions discovered the capture effect for the first time in 1938. Two experimental FM stations, 15 miles (24 km) apart in Albany and Schenectady, New York, were set up to transmit on the same frequency to see how reception would be affected.

Complete step by step answer:
The capture effect is defined as a phenomenon that occurs when FM signals are received. Only the stronger of two signals at or at the same frequency is demodulated in this occurrence. When the responsive tags are fractured at different distances from the reader, it causes this effect. The capture effect is defined as the full suppression of the weaker signal at the receiver's limiter (if one exists), where the weaker signal is muted rather than amplified. When both signals are roughly equal in intensity or fade separately, the receiver may flutter as it switches from one to the other.
For circuits that do not require a signal limiter, the capture effect might occur at the demodulation step. The capture effect is stronger in some types of radio receiver circuits than in others. The capture ratio is a measurement of how successfully a receiver rejects a second signal on the same frequency. It is defined as the lowest power ratio between two signals that causes the weaker signal to be suppressed. It was found that only one of the signals could be received over the majority of the journey between the two stations, with the removal of the other. This effect was shown to occur when the stronger signal was almost twice as powerful as the weaker one.

Note:
This was not the case with amplitude modulation transmissions, where the typical rule for broadcasting stations was that the stronger signal had to be approximately twenty times the weaker signal to avoid unacceptable interference. As a result of the capture effect, co-channel FM broadcasting stations might be positioned closer to each other than AM broadcasting stations without creating mutual interference.