公开(公告)号：CA614952A

公开(公告)日：1961-02-21

申请号：CA614952D

Applicant: RCA CORP

Inventor： HERMELING GILBERT C JR ,  HOROWITZ LEOPOLD A

公开(公告)号：CA1216666A

公开(公告)日：1987-01-13

申请号：CA457262

申请日：1984-06-22

Applicant: RCA CORP

Inventor： HERMELING GILBERT C JR ,  MUTERSPAUGH MAX W

IPC: H04N5/44 ,  H03D7/14 ,  H03D7/16 ,  H04B1/26

Abstract: In a double conversion tuner intended to tune UHF broadcast channels as well as VHF broadcast and cable channels, the frequency range of the first intermediate signal produced by the first mixer is selected to correspond to that of UHF channel 37. The frequency range of UHF channel 37 is reserved for radio astronomy and is, therefore, not used for the broadcast of television information. The tuner includes provisions for inhibiting interference from the RF signals corresponding to channels 36 and 38 which are adjacent to channel 37 and which are used for the broadcast of television information.