JPS54127601A - Tuning circuit of tuner - Google Patents
Tuning circuit of tunerInfo
- Publication number
- JPS54127601A JPS54127601A JP3489478A JP3489478A JPS54127601A JP S54127601 A JPS54127601 A JP S54127601A JP 3489478 A JP3489478 A JP 3489478A JP 3489478 A JP3489478 A JP 3489478A JP S54127601 A JPS54127601 A JP S54127601A
- Authority
- JP
- Japan
- Prior art keywords
- trq
- frequency
- capacitor
- gain
- tuning circuit
- 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.)
- Granted
Links
Landscapes
- Superheterodyne Receivers (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
PURPOSE: To eliminate the gain error within the reception band by providing fixed tuning circuit between the high-frequency amplification step and the mixer step, and thus to increase the RF gain.
CONSTITUTION: High-frequency amplifying NPN transistor TrQ1 is connected to the base of TrQ2 for mixer via coupling capacitor CS. Capacitor CT is connected between the base of TrQ2 and capacitor CS, and coil LT is connected between the earth and the connection of capacitor CS and CT. Thus, a parallel resonance circuit is formed with emitter-earthed input capacity Cie of TrQ2, stray capacity sum C and input conductance gie. This circuit functions as the fixed tuning circuit which tunes frequency fO determined by the value of coil LT and capacity C. As a result, frequency fO and its approximate frequency are always selected to be supplied to TrQ2, thus increasing the RF gain.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3489478A JPS5855698B2 (en) | 1978-03-28 | 1978-03-28 | tuner tuning circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3489478A JPS5855698B2 (en) | 1978-03-28 | 1978-03-28 | tuner tuning circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54127601A true JPS54127601A (en) | 1979-10-03 |
JPS5855698B2 JPS5855698B2 (en) | 1983-12-10 |
Family
ID=12426867
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3489478A Expired JPS5855698B2 (en) | 1978-03-28 | 1978-03-28 | tuner tuning circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5855698B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6433234U (en) * | 1987-08-25 | 1989-03-01 |
-
1978
- 1978-03-28 JP JP3489478A patent/JPS5855698B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6433234U (en) * | 1987-08-25 | 1989-03-01 |
Also Published As
Publication number | Publication date |
---|---|
JPS5855698B2 (en) | 1983-12-10 |
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