| 摘要 |
High-frequency head for television receiver, intended for translating radiofrequency signals from the VHF and UHF bands to a single IF band. It comprises: a VHF channel 70 and a UHF channel 80 for radio frequency RF amplification, which can be tuned at the same time as the local oscillators 120, 170 respectively, a combination circuit 200 combining on a single output the RF signals supplied by these channels 70, 80 in order to feed a single mixer-translator 210 which is common to the two frequency bands, VHF and UHF, and is equipped with at least one Schottky diode. Application to receivers of televised broadcasts. <IMAGE>
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