JPS59195844U

JPS59195844U - CATV converter

Info

Publication number: JPS59195844U
Application number: JP9128883U
Authority: JP
Inventors: 高浜　勝明
Original assignee: 日本電気ホームエレクトロニクス株式会社
Priority date: 1983-06-14
Filing date: 1983-06-14
Publication date: 1984-12-26

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は本考案の前提であるバンドパスフィルタを用い
たＣＡＴＶ：ｙ′ンバータの結合手段の要部回路図、第
２図は本考案に係るＣＡＴＶコンバータの結合要部回路
図、第３図は第１図及び第２図　　　−の周波数レスポ
ンス特性図、第４図は本考案のＣＡＴＶコンバータの筐
体要部の平面図、第５図は第４図の正面図、第６図は第
４図の背面図、第７図は第６図の要部断面図、第８図は
第４図のＣＡＴＶコンバータの電気系統ブロック図、及
び第９図は第８図の具体的回路図である。１１・・・・・・ダイオードミキサ（第２ミキサ回路）
、１２・・・・・・ＩＦ増幅器（第２ＩＦ増幅回路）、
１３・・・・・・複同調回路（結合手段）、１４．１５
・・・・・・同調回路。Fig. 1 is a circuit diagram of a main part of a coupling means of a CATV:y' inverter using a band-pass filter, which is the premise of the present invention, Fig. 2 is a circuit diagram of a main part of a coupling means of a CATV converter according to the present invention, and Fig. 3 are frequency response characteristic diagrams of Figs. 1 and 2-, Fig. 4 is a plan view of the main part of the CATV converter casing of the present invention, Fig. 5 is a front view of Fig. 4, and Fig. 6 is a diagram of the main part of the CATV converter of the present invention. 7 is a sectional view of the main part of FIG. 6, FIG. 8 is an electrical system block diagram of the CATV converter of FIG. 4, and FIG. 9 is a specific circuit diagram of FIG. 8. 11...Diode mixer (second mixer circuit)
, 12...IF amplifier (second IF amplifier circuit),
13...Double tuning circuit (coupling means), 14.15
...tuned circuit.

Claims

[Scope of utility model registration request]

an input tuning circuit coupled to the input terminal; a first local oscillator circuit for generating a variable frequency oscillation signal; a first mixer circuit for mixing the tuned input signal and the first local signal; and an output of the mixer circuit. a first frequency conversion means including a first IF amplification circuit that amplifies a certain first IF signal; a second local oscillation circuit that generates a fixed frequency oscillation signal; a second mixer circuit for mixing the oscillation signal and a 21st mixer circuit for mixing the oscillation signal;
and a second frequency conversion means including a second IF amplifier circuit that amplifies the F signal, and a double tuning circuit that tunes with the second IF signal between the second mixer circuit and the second IF amplifier circuit. A CATV converter characterized in that the second IF signal is selectively coupled to the second IF signal.