JPS55123229A - Tuner for television receiver - Google Patents
Tuner for television receiverInfo
- Publication number
- JPS55123229A JPS55123229A JP3001679A JP3001679A JPS55123229A JP S55123229 A JPS55123229 A JP S55123229A JP 3001679 A JP3001679 A JP 3001679A JP 3001679 A JP3001679 A JP 3001679A JP S55123229 A JPS55123229 A JP S55123229A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- disturbance
- mixer
- suppress
- oscillation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To suppress the disturbance generation of the 1st mixer by setting the 1st intermediate frequency not less than twice the upper limited frequency of the UHF band and not more than four times the lower limited frequency. CONSTITUTION:The oscillation frequency of the 1st local oscillation 13 is set higher than the 1st intermediate frequency fi1, and the oscillation frequency of the 2nd local oscillation 18 lower than frequency fi1 by the 2nd intermediate frequency fi2. Further, the 1st intermediate frequency fi1 is set not less than twice the upper limited frequency of the UHF band and not more than four times and lower limited frequency of the UHF band. Input circuit 10 of this tuner is provided with a trap attenuating frequencies fi2, fi1/2 and fi1/4 and the 1st mixer 12 suppresses the occurrence of disturbance of frequency fi1. Further, the 1st intermediate freqency filter 14 functions to suppress disturbance of fi1/2 in frequency and also has the BPF characteristics of a narrow band of approximate 8MHz to reduce cross modulation disturbance generated by the 1st intermediate amplifier 15, and filter 16 attenuates a frequency 2fi2 lower than fi1 to suppress image disturbance of the 2nd mixer 17.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3001679A JPS55123229A (en) | 1979-03-16 | 1979-03-16 | Tuner for television receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3001679A JPS55123229A (en) | 1979-03-16 | 1979-03-16 | Tuner for television receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55123229A true JPS55123229A (en) | 1980-09-22 |
Family
ID=12292047
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3001679A Pending JPS55123229A (en) | 1979-03-16 | 1979-03-16 | Tuner for television receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55123229A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5875316A (en) * | 1981-08-19 | 1983-05-07 | アールシーエー ライセンシング コーポレーシヨン | Multiple frequency band tuning system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5388511A (en) * | 1977-01-13 | 1978-08-04 | Sony Corp | Tuner |
-
1979
- 1979-03-16 JP JP3001679A patent/JPS55123229A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5388511A (en) * | 1977-01-13 | 1978-08-04 | Sony Corp | Tuner |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5875316A (en) * | 1981-08-19 | 1983-05-07 | アールシーエー ライセンシング コーポレーシヨン | Multiple frequency band tuning system |
JPH0322729B2 (en) * | 1981-08-19 | 1991-03-27 | Rca Licensing Corp |
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