A bandpass filter is an electronic device or circuit that allows signals between two specific frequencies to pass, but that discriminates against signals at other frequencies.In signal processing, a band-reject filter (also called a band-stop or notch filter) is a filter that passes most frequencies unaltered, but attenuates those in a specific range to very low levels. The main difference between...

VHF antennas and UHF antennas use very high frequency (VHF) and ultra-high frequency (UHF) signals for two-way radio, public safety, and commercial communications. VHF is the range of radio frequency (RF) signals from 30 to 300 MHz. UHF is the range between 300 MHz and 3 GHz.

What common products and technical equipment are used in radio systems? Radio systems are widely used in communication, broadcasting, radar, navigation and other fields. Their core components include transmission, reception, signal processing and antenna equipment. The following are the key products and technical equipment commonly used in radio systems: 1. RF transmission equipment (1) Radio tran...