What does a diplexer do?

A diplexer is an electronic component that can combine or separate two frequency ranges without causing mutual interference. The values ​​of possible interference are measured by the "Isolation in decibels (dB)" value. The diplexer allows two different signals to be sent or received over a common antenna by separating or combining the signals depending on their frequency. Among radio amateurs, the diplexer is often used to separate the signals of VHF and UHF so that a radio amateur can work on both bands with a single antenna. For SWL stations, this product allows listening to signals from different bands with a single antenna and two receivers operating simultaneously.