JPS55151812A - Television tuner circuit - Google Patents
Television tuner circuitInfo
- Publication number
- JPS55151812A JPS55151812A JP5911879A JP5911879A JPS55151812A JP S55151812 A JPS55151812 A JP S55151812A JP 5911879 A JP5911879 A JP 5911879A JP 5911879 A JP5911879 A JP 5911879A JP S55151812 A JPS55151812 A JP S55151812A
- Authority
- JP
- Japan
- Prior art keywords
- uhf
- receiving time
- vhf
- voltage
- backward bias
- 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
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
- H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
- H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
- H03J5/244—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To obtain a clear UHF picture image free from any disturbing phenomenon, by applying the backward bias to the switch diode used for the input circuit of the VHF tuner part and at the UHF receiving time by means of the power source to be supplied to the VHF mixer. CONSTITUTION:The voltage is applied to mixer 7 which is used for the IF amplifier at the UHF receiving time, and then the backward bias is applied to switch diodes 2 and 3 via resistance 19. Thus the vias voltage can be controlled via resistances 4, 5, 16, 17 and 19 each. And the disturbance property can be reduced by applying the deep backward bias voltage at the receiving time of UHF and even though the signal of large amplitude may be transmitted to the VHF input terminal. As a result, a clear UHF picture image can be obtained with an disturbing phenomenon.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5911879A JPS55151812A (en) | 1979-05-16 | 1979-05-16 | Television tuner circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5911879A JPS55151812A (en) | 1979-05-16 | 1979-05-16 | Television tuner circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55151812A true JPS55151812A (en) | 1980-11-26 |
Family
ID=13104071
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5911879A Pending JPS55151812A (en) | 1979-05-16 | 1979-05-16 | Television tuner circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55151812A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100746271B1 (en) * | 2006-05-19 | 2007-08-09 | 김선의 | Functional brassiere |
-
1979
- 1979-05-16 JP JP5911879A patent/JPS55151812A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100746271B1 (en) * | 2006-05-19 | 2007-08-09 | 김선의 | Functional brassiere |
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