JPS5642439A - Broad band tuner - Google Patents
Broad band tunerInfo
- Publication number
- JPS5642439A JPS5642439A JP11861879A JP11861879A JPS5642439A JP S5642439 A JPS5642439 A JP S5642439A JP 11861879 A JP11861879 A JP 11861879A JP 11861879 A JP11861879 A JP 11861879A JP S5642439 A JPS5642439 A JP S5642439A
- Authority
- JP
- Japan
- Prior art keywords
- oscillator
- frequency
- variable
- oscillation frequency
- local 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
- 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
- H03J5/02—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 variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
Landscapes
- Superheterodyne Receivers (AREA)
Abstract
PURPOSE:To stabilize broad band tuning byf making it possible to select the oscillation frequency band of a variable oscillator independently of an intermediate frequency by obtaining a local oscillation frequency signal from the difference in frequency between the variable oscillator and a fixed oscillator. CONSTITUTION:Of the television tuner, local oscillating circuit 6 consists of variable oscillator 61, fixed oscillator 62 and mixer 63 and the frequency difference between oscillators 61 and 62 is generated as a local oscillation frequency signal. For this purpose, a relatively high frequency band of 3,150-3,824MHz, etc., is used for oscillator 61 and the local oscillation frequency of oscillator 62 is only set to 3,000MHz so as to set the local oscillation frequency in the normally used range of 150-824MHz for the single conversion system. Consequently, an input signal to mixer 5 is converted into a signal of the current intermediate frequency, which is outputted to tuner output 7. Thus, the oscillation frequency of variable oscillator 61 can be selected in the variable range of the variable tuning element independently of the intermediate frequency.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11861879A JPS5642439A (en) | 1979-09-14 | 1979-09-14 | Broad band tuner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11861879A JPS5642439A (en) | 1979-09-14 | 1979-09-14 | Broad band tuner |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5642439A true JPS5642439A (en) | 1981-04-20 |
Family
ID=14740995
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11861879A Pending JPS5642439A (en) | 1979-09-14 | 1979-09-14 | Broad band tuner |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5642439A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56117436A (en) * | 1980-02-21 | 1981-09-14 | Matsushita Electric Ind Co Ltd | Television tuner |
JPS59217560A (en) * | 1983-05-25 | 1984-12-07 | M Ii D Kk | Material feed controller |
-
1979
- 1979-09-14 JP JP11861879A patent/JPS5642439A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56117436A (en) * | 1980-02-21 | 1981-09-14 | Matsushita Electric Ind Co Ltd | Television tuner |
JPS59217560A (en) * | 1983-05-25 | 1984-12-07 | M Ii D Kk | Material feed controller |
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