Radio frequency signal preselector for electric tuning
A technology of radio frequency signals and preselectors, applied in electrical components, transmission monitoring, transmission systems, etc., can solve problems such as inconvenient use, high cost, and large volume of switch filter matrix, and achieve flexible and convenient use, good effect, and compact size The effect of cost reduction
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[0015]The reason why the existing switch filter matrix preselector is large in size and high in cost is that it uses a filter with a fixed center frequency and bandwidth. In order to perform signal preselection, it can only switch between filters with different center frequencies and bandwidths. Considering that the high-band YIG filter uses a band-pass filter with tunable center frequency, the signal preselection is realized by tuning the center frequency; only one filter is small in size and easy to use. If the low band uses an adjustable filter instead of a fixed filter for signal preselection, the volume should also be reduced. Since no single type of tunable filter can cover the entire low-band receiver, to use tunable filters for low-band signal preselection, multiple different tunable filters are used in parallel with the switching filter matrix. Similar to using a switch control to switch between different filters. Since one tunable filter can replace the signal prese...
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