| 摘要 |
1. High-frequency stage unit of a UHF- and VHF-receiver section of a television apparatus which is of single board chassis construction, characterised in that the whole high-frequency stage is built on this single board chassis (1) a rectangular frame (2) with corresponding dividing walls (10, 11) being fixed as shielding on the component side by having cut portions around its periphery which extend through a series of cut apertures in the printed circuit board, the cut portions on the solder side of the board projecting somewhat, or by electrical connection of a flatter corresponding frame on the solder side to the first frame on the component side by means of a plurality of connecting cut portions along its periphery, the frame or both of them, on the component and on the solder side, having a cover sealingly connected at its edges with sprung clips or tongues ; that on the component side within the frame (2) are two sub-chassis (5, 6), with their own perpendicular frames, connected perpendicularly and parallel to each other, and by means of corresponding pin connectors or solder connection means, to the parts of the high-frequency stage which surround them and which operate with them ; and that the two sub-chassis carry the UHF- or VHF-selection and pre-amplification stages in which are concentrated the variables such as regional and/or country standards.
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