cavity filter การใช้

• The filter may be made from cellulose acetate fibre, paper or activated charcoal ( either as a cavity filter or embedded into the cellulose acetate ).
• Still widely used in the 40 MHz to 960 MHz frequency range, well constructed cavity filters are capable of high selectivity even under power loads of at least a megawatt.
• In the microwave range ( 1000 MHz ( or 1 GHz ) and higher ), cavity filters become more practical in terms of size and a significantly higher quality factor than lumped element resonators and filters.
• Physical length of conventional cavity filters can vary from over 205 cm ( 82 " ) in the 40 MHz range, down to under 27.5 cm ( 11 " ) in the 900 MHz range.
• When a transmitter needs to be colocated with a receiver where the frequency difference is very small ( " for example 145.000 and 145.600 MHz " ) the cavity filters can be used on both the transmitter and the receiver to improve the purity of the transmitter and the immunity of the receiver.
• Its products include accessories and connectors, antennas, attenuators, cavity filters, combining systems, components, duplexers and triplexers, laboratory grade instruments, plug-in elements, power measurement products, preselectors, spectrum analyzers, vector network analyzers, signal boosters, terminations and loads, test equipment, tower top amplifiers, receiver multicouplers, and wattmeters and line sections.